Compilation errors and merge mixups fixed

24 files changed, 358 insertions, 728 deletions

diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ResizePictureUserDecisionListener.java b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ResizePictureUserDecisionListener.java
index ac58e698..7d676022 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ResizePictureUserDecisionListener.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ResizePictureUserDecisionListener.java
@@ -60,6 +60,7 @@ public class ResizePictureUserDecisionListener implements UserDecisionListener {
             @Override
             public void error(int error, Message message) {
                 hidePrepareFileToast();
+                //TODO Find another way to display an error dialog
                 ResizePictureUserDecisionListener.this.activity.displayErrorDialog(error);
             }
 
@@ -97,10 +98,10 @@ public class ResizePictureUserDecisionListener implements UserDecisionListener {
         this.showPrepareFileToast();
         final Message message;
         final boolean forceEncryption = ConversationsPlusPreferences.forceEncryption();
-        if (conversation.getNextEncryption(forceEncryption) == Message.ENCRYPTION_PGP) {
+        if (conversation.getNextEncryption() == Message.ENCRYPTION_PGP) {
             message = new Message(conversation, "", Message.ENCRYPTION_DECRYPTED);
         } else {
-            message = new Message(conversation, "", conversation.getNextEncryption(forceEncryption));
+            message = new Message(conversation, "", conversation.getNextEncryption());
         }
         message.setCounterpart(conversation.getNextCounterpart());
         message.setType(Message.TYPE_IMAGE);
@@ -116,7 +117,7 @@ public class ResizePictureUserDecisionListener implements UserDecisionListener {
                     int imageWidth = resizedAndRotatedImage.getWidth();
                     int imageHeight = resizedAndRotatedImage.getHeight();
                     MessageUtil.updateMessageWithImageDetails(message, filePath, imageSize, imageWidth, imageHeight);
-                    if (conversation.getNextEncryption(forceEncryption) == Message.ENCRYPTION_PGP) {
+                    if (conversation.getNextEncryption() == Message.ENCRYPTION_PGP) {
                         xmppConnectionService.getPgpEngine().encrypt(message, callback);
                     } else {
                         callback.success(message);
@@ -134,10 +135,10 @@ public class ResizePictureUserDecisionListener implements UserDecisionListener {
         this.showPrepareFileToast();
         final Message message;
         final boolean forceEncryption = ConversationsPlusPreferences.forceEncryption();
-        if (conversation.getNextEncryption(forceEncryption) == Message.ENCRYPTION_PGP) {
+        if (conversation.getNextEncryption() == Message.ENCRYPTION_PGP) {
             message = new Message(conversation, "", Message.ENCRYPTION_DECRYPTED);
         } else {
-            message = new Message(conversation, "", conversation.getNextEncryption(forceEncryption));
+            message = new Message(conversation, "", conversation.getNextEncryption());
         }
         message.setCounterpart(conversation.getNextCounterpart());
         message.setType(Message.TYPE_IMAGE);
@@ -155,7 +156,7 @@ public class ResizePictureUserDecisionListener implements UserDecisionListener {
                     int imageWidth = options.outWidth;
                     String filePath = FileHelper.getRealPathFromUri(uri);
                     MessageUtil.updateMessageWithImageDetails(message, filePath, imageSize, imageWidth, imageHeight);
-                    if (conversation.getNextEncryption(forceEncryption) == Message.ENCRYPTION_PGP) {
+                    if (conversation.getNextEncryption() == Message.ENCRYPTION_PGP) {
                         xmppConnectionService.getPgpEngine().encrypt(message, callback);
                     } else {
                         callback.success(message);
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/MessageUtil.java b/src/main/java/de/thedevstack/conversationsplus/utils/MessageUtil.java
index 9fedada6..81f5b843 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/MessageUtil.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/MessageUtil.java
@@ -3,6 +3,8 @@ package de.thedevstack.conversationsplus.utils;
 import android.graphics.BitmapFactory;
 
 import java.net.URL;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import eu.siacs.conversations.entities.DownloadableFile;
 import eu.siacs.conversations.entities.Message;
@@ -12,6 +14,26 @@ import eu.siacs.conversations.persistance.FileBackend;
  * Created by tzur on 15.12.2015.
  */
 public final class MessageUtil {
+    public static boolean wasHighlightedOrPrivate(final Message message) {
+        final String nick = message.getConversation().getMucOptions().getActualNick();
+        final Pattern highlight = generateNickHighlightPattern(nick);
+        if (message.getBody() == null || nick == null) {
+            return false;
+        }
+        final Matcher m = highlight.matcher(message.getBody());
+        return (m.find() || message.getType() == Message.TYPE_PRIVATE);
+    }
+
+    private static Pattern generateNickHighlightPattern(final String nick) {
+        // We expect a word boundary, i.e. space or start of string, followed by
+        // the
+        // nick (matched in case-insensitive manner), followed by optional
+        // punctuation (for example "bob: i disagree" or "how are you alice?"),
+        // followed by another word boundary.
+        return Pattern.compile("\\b" + Pattern.quote(nick) + "\\p{Punct}?\\b",
+                Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
+    }
+
     public static void updateMessageWithImageDetails(Message message, String filePath, long size, int imageWidth, int imageHeight) {
         message.setRelativeFilePath(filePath);
         MessageUtil.updateMessageBodyWithImageParams(message, size, imageWidth, imageHeight);
diff --git a/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java b/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
index 1f889cd8..b256b16f 100644
--- a/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
+++ b/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
@@ -20,6 +20,7 @@ import java.net.URL;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
 import de.thedevstack.conversationsplus.utils.MessageUtil;
 
+import de.thedevstack.conversationsplus.utils.StreamUtil;
 import eu.siacs.conversations.R;
 import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.entities.Contact;
@@ -90,10 +91,8 @@ public class PgpEngine {
 			});
 		} else if (message.getType() == Message.TYPE_IMAGE || message.getType() == Message.TYPE_FILE) {
 			try {
-				final DownloadableFile inputFile = this.mXmppConnectionService
-						.getFileBackend().getFile(message, false);
-				final DownloadableFile outputFile = this.mXmppConnectionService
-						.getFileBackend().getFile(message, true);
+				final DownloadableFile inputFile = FileBackend.getFile(message, false);
+				final DownloadableFile outputFile = FileBackend.getFile(message, true);
 				outputFile.getParentFile().mkdirs();
 				outputFile.createNewFile();
 				InputStream is = new FileInputStream(inputFile);
@@ -197,10 +196,8 @@ public class PgpEngine {
 			});
 		} else {
 			try {
-				DownloadableFile inputFile = this.mXmppConnectionService
-						.getFileBackend().getFile(message, true);
-				DownloadableFile outputFile = this.mXmppConnectionService
-						.getFileBackend().getFile(message, false);
+				DownloadableFile inputFile = FileBackend.getFile(message, true);
+				DownloadableFile outputFile = FileBackend.getFile(message, false);
 				outputFile.getParentFile().mkdirs();
 				outputFile.createNewFile();
 				final InputStream is = new FileInputStream(inputFile);
@@ -218,7 +215,7 @@ public class PgpEngine {
 							} catch (IOException ignored) {
 								//ignored
 							}
-							FileBackend.close(os);
+							StreamUtil.close(os);
 							callback.success(message);
 							break;
 						case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED:
diff --git a/src/main/java/eu/siacs/conversations/entities/Conversation.java b/src/main/java/eu/siacs/conversations/entities/Conversation.java
index 38791d28..64472c8f 100644
--- a/src/main/java/eu/siacs/conversations/entities/Conversation.java
+++ b/src/main/java/eu/siacs/conversations/entities/Conversation.java
@@ -19,6 +19,7 @@ import java.util.Comparator;
 import java.util.Iterator;
 import java.util.List;
 
+import de.thedevstack.conversationsplus.utils.MessageUtil;
 import eu.siacs.conversations.Config;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
 import eu.siacs.conversations.crypto.axolotl.AxolotlService;
@@ -831,7 +832,7 @@ public class Conversation extends AbstractEntity implements Blockable {
 				}
 				if (getMode() == Conversation.MODE_SINGLE
 						|| ConversationsPlusPreferences.alwaysNotifyInConference()
-						|| account.getXmppConnectionService().getNotificationService().wasHighlightedOrPrivate(message)
+						|| MessageUtil.wasHighlightedOrPrivate(message)
 						) {
 					++count;
 				}
diff --git a/src/main/java/eu/siacs/conversations/entities/Message.java b/src/main/java/eu/siacs/conversations/entities/Message.java
index 8d0571a4..d7a4ef18 100644
--- a/src/main/java/eu/siacs/conversations/entities/Message.java
+++ b/src/main/java/eu/siacs/conversations/entities/Message.java
@@ -419,7 +419,7 @@ public class Message extends AbstractEntity {
 						message.treatAsDownloadable() == Decision.NEVER &&
 						this.treatAsDownloadable() == Decision.NEVER &&
 						!message.getBody().startsWith(ME_COMMAND) &&
-						!this.getBody().startsWith(ME_COMMAND)
+						!this.getBody().startsWith(ME_COMMAND) &&
 						this.isTrusted() == message.isTrusted()
 				);
 	}
diff --git a/src/main/java/eu/siacs/conversations/generator/IqGenerator.java b/src/main/java/eu/siacs/conversations/generator/IqGenerator.java
index 6bc1f0fc..854c5e6b 100644
--- a/src/main/java/eu/siacs/conversations/generator/IqGenerator.java
+++ b/src/main/java/eu/siacs/conversations/generator/IqGenerator.java
@@ -120,7 +120,7 @@ public class IqGenerator extends AbstractGenerator {
 		return packet;
 	}
 
-	public IqPacket retrieveVcardAvatar(final Avatar avatar) {
+	public static IqPacket retrieveVcardAvatar(final Avatar avatar) {
 		final IqPacket packet = new IqPacket(IqPacket.TYPE.GET);
 		packet.setTo(avatar.owner);
 		packet.addChild("vCard", "vcard-temp");
diff --git a/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java b/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
index 516d3141..04f47fae 100644
--- a/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
+++ b/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
@@ -2,29 +2,36 @@ package eu.siacs.conversations.http;
 
 import android.content.Intent;
 import android.net.Uri;
+import android.os.PowerManager;
 import android.os.SystemClock;
 
 import java.io.BufferedInputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.Arrays;
+import java.util.concurrent.CancellationException;
 
 import javax.net.ssl.HttpsURLConnection;
 import javax.net.ssl.SSLHandshakeException;
 
 import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
 import de.thedevstack.conversationsplus.utils.MessageUtil;
 
+import de.thedevstack.conversationsplus.utils.StreamUtil;
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.R;
 import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.entities.DownloadableFile;
 import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.entities.TransferablePlaceholder;
 import eu.siacs.conversations.persistance.FileBackend;
+import eu.siacs.conversations.services.AbstractConnectionManager;
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.utils.CryptoHelper;
 
@@ -39,11 +46,13 @@ public class HttpDownloadConnection implements Transferable {
 	private int mStatus = Transferable.STATUS_UNKNOWN;
 	private boolean acceptedAutomatically = false;
 	private int mProgress = 0;
-	private long mLastGuiRefresh = 0;
+    private boolean mUseTor = false;
+    private boolean canceled = false;
 
 	public HttpDownloadConnection(HttpConnectionManager manager) {
 		this.mHttpConnectionManager = manager;
 		this.mXmppConnectionService = manager.getXmppConnectionService();
+        this.mUseTor = mXmppConnectionService.useTorToConnect();
 	}
 
 	@Override
@@ -65,39 +74,45 @@ public class HttpDownloadConnection implements Transferable {
 	}
 
 	public void init(Message message, boolean interactive) {
-		this.message = message;
-		this.message.setTransferable(this);
-		try {
-			mUrl = new URL(message.getBody());
-			String[] parts = mUrl.getPath().toLowerCase().split("\\.");
-			String lastPart = parts.length >= 1 ? parts[parts.length - 1] : null;
-			String secondToLast = parts.length >= 2 ? parts[parts.length -2] : null;
-			if ("pgp".equals(lastPart) || "gpg".equals(lastPart)) {
-				this.message.setEncryption(Message.ENCRYPTION_PGP);
-			} else if (message.getEncryption() != Message.ENCRYPTION_OTR) {
-				this.message.setEncryption(Message.ENCRYPTION_NONE);
-			}
-			String extension;
-			if (Arrays.asList(VALID_CRYPTO_EXTENSIONS).contains(lastPart)) {
-				extension = secondToLast;
-			} else {
-				extension = lastPart;
-			}
-			message.setRelativeFilePath(message.getUuid()+"."+extension);
-			this.file = FileBackend.getFile(message, false);
-			String reference = mUrl.getRef();
-			if (reference != null && reference.length() == 96) {
-				this.file.setKey(CryptoHelper.hexToBytes(reference));
-			}
-
-			if (this.message.getEncryption() == Message.ENCRYPTION_OTR
-					&& this.file.getKey() == null) {
-				this.message.setEncryption(Message.ENCRYPTION_NONE);
-					}
-			checkFileSize(interactive);
-		} catch (MalformedURLException e) {
-			this.cancel();
-		}
+        this.message = message;
+        this.message.setTransferable(this);
+        try {
+            if (message.hasFileOnRemoteHost()) {
+                mUrl = message.getFileParams().url;
+            } else {
+                mUrl = new URL(message.getBody());
+            }
+            String[] parts = mUrl.getPath().toLowerCase().split("\\.");
+            String lastPart = parts.length >= 1 ? parts[parts.length - 1] : null;
+            String secondToLast = parts.length >= 2 ? parts[parts.length -2] : null;
+            if ("pgp".equals(lastPart) || "gpg".equals(lastPart)) {
+                this.message.setEncryption(Message.ENCRYPTION_PGP);
+            } else if (message.getEncryption() != Message.ENCRYPTION_OTR
+                    && message.getEncryption() != Message.ENCRYPTION_AXOLOTL) {
+                this.message.setEncryption(Message.ENCRYPTION_NONE);
+            }
+            String extension;
+            if (Arrays.asList(VALID_CRYPTO_EXTENSIONS).contains(lastPart)) {
+                extension = secondToLast;
+            } else {
+                extension = lastPart;
+            }
+            message.setRelativeFilePath(message.getUuid()+"."+extension);
+            this.file = FileBackend.getFile(message, false);
+            String reference = mUrl.getRef();
+            if (reference != null && reference.length() == 96) {
+                this.file.setKeyAndIv(CryptoHelper.hexToBytes(reference));
+            }
+
+            if ((this.message.getEncryption() == Message.ENCRYPTION_OTR
+                    || this.message.getEncryption() == Message.ENCRYPTION_AXOLOTL)
+                    && this.file.getKey() == null) {
+                this.message.setEncryption(Message.ENCRYPTION_NONE);
+            }
+            checkFileSize(interactive);
+        } catch (MalformedURLException e) {
+            this.cancel();
+        }
 	}
 
 	private void checkFileSize(boolean interactive) {
@@ -105,21 +120,29 @@ public class HttpDownloadConnection implements Transferable {
 	}
 
 	public void cancel() {
-		mHttpConnectionManager.finishConnection(this);
-		message.setTransferable(null);
-		mXmppConnectionService.updateConversationUi();
+        this.canceled = true;
+        mHttpConnectionManager.finishConnection(this);
+        if (message.isFileOrImage()) {
+            message.setTransferable(new TransferablePlaceholder(Transferable.STATUS_DELETED));
+        } else {
+            message.setTransferable(null);
+        }
+        mXmppConnectionService.updateConversationUi();
 	}
 
 	private void finish() {
-		Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
-		intent.setData(Uri.fromFile(file));
-		mXmppConnectionService.sendBroadcast(intent);
-		message.setTransferable(null);
-		mHttpConnectionManager.finishConnection(this);
-		mXmppConnectionService.updateConversationUi();
-		if (acceptedAutomatically) {
-			mXmppConnectionService.getNotificationService().push(message);
-		}
+        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
+        intent.setData(Uri.fromFile(file));
+        mXmppConnectionService.sendBroadcast(intent);
+        message.setTransferable(null);
+        mHttpConnectionManager.finishConnection(this);
+        if (message.getEncryption() == Message.ENCRYPTION_PGP) {
+            message.getConversation().getAccount().getPgpDecryptionService().add(message);
+        }
+        mXmppConnectionService.updateConversationUi();
+        if (acceptedAutomatically) {
+            mXmppConnectionService.getNotificationService().push(message);
+        }
 	}
 
 	private void changeStatus(int status) {
@@ -127,6 +150,17 @@ public class HttpDownloadConnection implements Transferable {
 		mXmppConnectionService.updateConversationUi();
 	}
 
+	private void showToastForException(Exception e) {
+		e.printStackTrace();
+		if (e instanceof java.net.UnknownHostException) {
+			mXmppConnectionService.showErrorToastInUi(R.string.download_failed_server_not_found);
+		} else if (e instanceof java.net.ConnectException) {
+			mXmppConnectionService.showErrorToastInUi(R.string.download_failed_could_not_connect);
+		} else if (!(e instanceof CancellationException)) {
+			mXmppConnectionService.showErrorToastInUi(R.string.download_failed_file_not_found);
+		}
+	}
+
 	private class FileSizeChecker implements Runnable {
 
 		private boolean interactive = false;
@@ -148,7 +182,7 @@ public class HttpDownloadConnection implements Transferable {
 			} catch (IOException e) {
 				Logging.d(Config.LOGTAG, "io exception in http file size checker: " + e.getMessage());
 				if (interactive) {
-					mXmppConnectionService.showErrorToastInUi(R.string.file_not_found_on_remote_host);
+					showToastForException(e);
 				}
 				cancel();
 				return;
@@ -165,31 +199,43 @@ public class HttpDownloadConnection implements Transferable {
 		}
 
 		private long retrieveFileSize() throws IOException {
-			Logging.d(Config.LOGTAG,"retrieve file size. interactive:"+String.valueOf(interactive));
-			changeStatus(STATUS_CHECKING);
-			HttpURLConnection connection = (HttpURLConnection) mUrl.openConnection();
-			connection.setRequestMethod("HEAD");
-			if (connection instanceof HttpsURLConnection) {
-				mHttpConnectionManager.setupTrustManager((HttpsURLConnection) connection, interactive);
-			}
-			connection.connect();
-			String contentLength = connection.getHeaderField("Content-Length");
-			if (contentLength == null) {
-				return -1;
-			}
-			try {
-				return Long.parseLong(contentLength, 10);
-			} catch (NumberFormatException e) {
-				return -1;
-			}
+            try {
+                Logging.d(Config.LOGTAG, "retrieve file size. interactive:" + String.valueOf(interactive));
+                changeStatus(STATUS_CHECKING);
+                HttpURLConnection connection;
+                if (mUseTor) {
+                    connection = (HttpURLConnection) mUrl.openConnection(mHttpConnectionManager.getProxy());
+                } else {
+                    connection = (HttpURLConnection) mUrl.openConnection();
+                }
+                connection.setRequestMethod("HEAD");
+                Logging.d(Config.LOGTAG, "url: "+connection.getURL().toString());
+                Logging.d(Config.LOGTAG, "connection: "+connection.toString());
+                connection.setRequestProperty("User-Agent", ConversationsPlusApplication.getNameAndVersion());
+                if (connection instanceof HttpsURLConnection) {
+                    mHttpConnectionManager.setupTrustManager((HttpsURLConnection) connection, interactive);
+                }
+                connection.connect();
+                String contentLength = connection.getHeaderField("Content-Length");
+                connection.disconnect();
+                if (contentLength == null) {
+                    return -1;
+                }
+                return Long.parseLong(contentLength, 10);
+            } catch (IOException e) {
+                return -1;
+            } catch (NumberFormatException e) {
+                return -1;
+            }
 		}
-
 	}
 
 	private class FileDownloader implements Runnable {
 
 		private boolean interactive = false;
 
+        private OutputStream os;
+
 		public FileDownloader(boolean interactive) {
 			this.interactive = interactive;
 		}
@@ -203,37 +249,74 @@ public class HttpDownloadConnection implements Transferable {
 				finish();
 			} catch (SSLHandshakeException e) {
 				changeStatus(STATUS_OFFER);
-			} catch (IOException e) {
-				mXmppConnectionService.showErrorToastInUi(R.string.file_not_found_on_remote_host);
-				cancel();
+			} catch (Exception e) {
+                if (interactive) {
+                    showToastForException(e);
+                }
+                cancel();
 			}
 		}
 
 		private void download() throws SSLHandshakeException, IOException {
-			HttpURLConnection connection = (HttpURLConnection) mUrl.openConnection();
-			if (connection instanceof HttpsURLConnection) {
-				mHttpConnectionManager.setupTrustManager((HttpsURLConnection) connection, interactive);
-			}
-			connection.connect();
-			BufferedInputStream is = new BufferedInputStream(connection.getInputStream());
-			file.getParentFile().mkdirs();
-			file.createNewFile();
-			OutputStream os = file.createOutputStream();
-			if (os == null) {
-				throw new IOException();
-			}
-			long transmitted = 0;
-			long expected = file.getExpectedSize();
-			int count = -1;
-			byte[] buffer = new byte[1024];
-			while ((count = is.read(buffer)) != -1) {
-				transmitted += count;
-				os.write(buffer, 0, count);
-				updateProgress((int) ((((double) transmitted) / expected) * 100));
-			}
-			os.flush();
-			os.close();
-			is.close();
+            InputStream is = null;
+            PowerManager.WakeLock wakeLock = mHttpConnectionManager.createWakeLock("http_download_"+message.getUuid());
+            try {
+                wakeLock.acquire();
+                HttpURLConnection connection;
+                if (mUseTor) {
+                    connection = (HttpURLConnection) mUrl.openConnection(mHttpConnectionManager.getProxy());
+                } else {
+                    connection = (HttpURLConnection) mUrl.openConnection();
+                }
+                if (connection instanceof HttpsURLConnection) {
+                    mHttpConnectionManager.setupTrustManager((HttpsURLConnection) connection, interactive);
+                }
+                connection.setRequestProperty("User-Agent", ConversationsPlusApplication.getNameAndVersion());
+                final boolean tryResume = file.exists() && file.getKey() == null;
+                if (tryResume) {
+                    Logging.d(Config.LOGTAG, "http download trying resume");
+                    long size = file.getSize();
+                    connection.setRequestProperty("Range", "bytes="+size+"-");
+                }
+                connection.connect();
+                is = new BufferedInputStream(connection.getInputStream());
+                boolean serverResumed = "bytes".equals(connection.getHeaderField("Accept-Ranges"));
+                long transmitted = 0;
+                long expected = file.getExpectedSize();
+                if (tryResume && serverResumed) {
+                    Logging.d(Config.LOGTAG, "server resumed");
+                    transmitted = file.getSize();
+                    updateProgress((int) ((((double) transmitted) / expected) * 100));
+                    os = AbstractConnectionManager.createAppendedOutputStream(file);
+                } else {
+                    file.getParentFile().mkdirs();
+                    file.createNewFile();
+                    os = AbstractConnectionManager.createOutputStream(file, true);
+                }
+                int count = -1;
+                byte[] buffer = new byte[1024];
+                while ((count = is.read(buffer)) != -1) {
+                    transmitted += count;
+                    os.write(buffer, 0, count);
+                    updateProgress((int) ((((double) transmitted) / expected) * 100));
+                    if (canceled) {
+                        throw new CancellationException();
+                    }
+                }
+            } catch (CancellationException | IOException e) {
+                throw e;
+            } finally {
+                if (os != null) {
+                    try {
+                        os.flush();
+                    } catch (final IOException ignored) {
+
+                    }
+                }
+                StreamUtil.close(os);
+                StreamUtil.close(is);
+                wakeLock.release();
+            }
 		}
 
 		private void updateImageBounds() {
@@ -241,15 +324,11 @@ public class HttpDownloadConnection implements Transferable {
 			MessageUtil.updateFileParams(message, mUrl);
 			mXmppConnectionService.updateMessage(message);
 		}
-
 	}
 
 	public void updateProgress(int i) {
-		this.mProgress = i;
-		if (SystemClock.elapsedRealtime() - this.mLastGuiRefresh > Config.PROGRESS_UI_UPDATE_INTERVAL) {
-			this.mLastGuiRefresh = SystemClock.elapsedRealtime();
-			mXmppConnectionService.updateConversationUi();
-		}
+        this.mProgress = i;
+        mXmppConnectionService.updateConversationUi();
 	}
 
 	@Override
diff --git a/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java b/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java
index 553988ae..6d1ea732 100644
--- a/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java
+++ b/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java
@@ -99,13 +99,13 @@ public class HttpUploadConnection implements Transferable {
 		mHttpConnectionManager.finishUploadConnection(this);
 		message.setTransferable(null);
 		mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
-		FileBackend.close(mFileInputStream);
+		StreamUtil.close(mFileInputStream);
 	}
 
 	public void init(Message message, boolean delay) {
 		this.message = message;
 		this.account = message.getConversation().getAccount();
-		this.file = mXmppConnectionService.getFileBackend().getFile(message, false);
+		this.file = FileBackend.getFile(message, false);
 		this.mime = this.file.getMimeType();
 		this.delayed = delay;
 		if (Config.ENCRYPT_ON_HTTP_UPLOADED
@@ -232,7 +232,6 @@ public class HttpUploadConnection implements Transferable {
 				Logging.d(Config.LOGTAG, e.getMessage());
 				fail();
 			} finally {
-				StreamUtil.close(is);
 				StreamUtil.close(os);
 				if (connection != null) {
 					connection.disconnect();
diff --git a/src/main/java/eu/siacs/conversations/parser/PresenceParser.java b/src/main/java/eu/siacs/conversations/parser/PresenceParser.java
index bbb21c84..d55101da 100644
--- a/src/main/java/eu/siacs/conversations/parser/PresenceParser.java
+++ b/src/main/java/eu/siacs/conversations/parser/PresenceParser.java
@@ -4,6 +4,8 @@ import android.util.Log;
 
 import java.util.ArrayList;
 import java.util.List;
+
+import de.thedevstack.android.logcat.Logging;
 import de.thedevstack.conversationsplus.utils.AvatarUtil;
 import de.thedevstack.conversationsplus.utils.UiUpdateHelper;
 
@@ -42,7 +44,7 @@ public class PresenceParser extends AbstractParser implements
 			processConferencePresence(packet, mucOptions);
 			final List<MucOptions.User> tileUserAfter = mucOptions.getUsers(5);
 			if (!tileUserAfter.equals(tileUserBefore)) {
-				Loggin.d(Config.LOGTAG,account.getJid().toBareJid()+": update tiles for "+conversation.getName());
+				Logging.d(Config.LOGTAG, account.getJid().toBareJid() + ": update tiles for " + conversation.getName());
 				AvatarService.getInstance().clear(conversation);
 			}
 			if (before != mucOptions.online() || (mucOptions.online() && count != mucOptions.getUserCount())) {
@@ -94,12 +96,12 @@ public class PresenceParser extends AbstractParser implements
 						}
 						if (avatar != null) {
 							avatar.owner = from;
-							if (mXmppConnectionService.getFileBackend().isAvatarCached(avatar)) {
+							if (AvatarUtil.isAvatarCached(avatar)) {
 								if (user.setAvatar(avatar)) {
-									mXmppConnectionService.getAvatarService().clear(user);
+									AvatarService.getInstance().clear(user);
 								}
 							} else {
-								mXmppConnectionService.fetchAvatar(mucOptions.getAccount(), avatar);
+								AvatarService.getInstance().fetchAvatar(mucOptions.getAccount(), avatar);
 							}
 						}
 					}
@@ -122,7 +124,7 @@ public class PresenceParser extends AbstractParser implements
 				} else if (!from.isBareJid()){
 					MucOptions.User user = mucOptions.deleteUser(from.getResourcepart());
 					if (user != null) {
-						mXmppConnectionService.getAvatarService().clear(user);
+						AvatarService.getInstance().clear(user);
 					}
 				}
 			} else if (type.equals("error")) {
diff --git a/src/main/java/eu/siacs/conversations/persistance/FileBackend.java b/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
index f242b928..c03e5764 100644
--- a/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
+++ b/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
@@ -1,41 +1,21 @@
 package eu.siacs.conversations.persistance;
 
 import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
-import android.graphics.Canvas;
-import android.graphics.Matrix;
-import android.graphics.RectF;
 import android.net.Uri;
 import android.os.Environment;
-import android.util.Base64;
-import android.util.Base64OutputStream;
 import android.util.Log;
 import android.webkit.MimeTypeMap;
 
-import java.io.ByteArrayOutputStream;
-import java.io.Closeable;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.net.Socket;
-import java.net.URL;
-import java.security.DigestOutputStream;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
 import java.text.SimpleDateFormat;
-import java.util.Arrays;
 import java.util.Date;
 import java.util.Locale;
 
-import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
-import android.net.Uri;
-import android.os.Environment;
-import android.webkit.MimeTypeMap;
-
 import de.thedevstack.android.logcat.Logging;
 import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
@@ -44,30 +24,17 @@ import de.thedevstack.conversationsplus.utils.StreamUtil;
 
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.R;
-import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.entities.DownloadableFile;
 import eu.siacs.conversations.entities.Message;
-import eu.siacs.conversations.entities.Transferable;
-import eu.siacs.conversations.services.XmppConnectionService;
-import eu.siacs.conversations.utils.CryptoHelper;
-import eu.siacs.conversations.utils.ExifHelper;
-import eu.siacs.conversations.utils.FileUtils;
-import eu.siacs.conversations.xmpp.pep.Avatar;
 
 public class FileBackend {
-	private final SimpleDateFormat imageDateFormat = new SimpleDateFormat("yyyyMMdd_HHmmssSSS", Locale.US);
-
-	private XmppConnectionService mXmppConnectionService;
+	private static final SimpleDateFormat imageDateFormat = new SimpleDateFormat("yyyyMMdd_HHmmssSSS", Locale.US);
 
-	public FileBackend(XmppConnectionService service) {
-		this.mXmppConnectionService = service;
-	}
-
-	public DownloadableFile getFile(Message message) {
+	public static DownloadableFile getFile(Message message) {
 		return getFile(message, true);
 	}
 
-	public DownloadableFile getFile(Message message, boolean decrypted) {
+	public static DownloadableFile getFile(Message message, boolean decrypted) {
 		final boolean encrypted = !decrypted
 				&& (message.getEncryption() == Message.ENCRYPTION_PGP
 				|| message.getEncryption() == Message.ENCRYPTION_DECRYPTED);
@@ -109,34 +76,7 @@ public class FileBackend {
         return FileBackend.getPrivateFileDirectoryPath() + File.separator + "Images" + File.separator;
     }
 
-	public boolean useImageAsIs(Uri uri) {
-		String path = getOriginalPath(uri);
-		if (path == null) {
-			return false;
-		}
-		File file = new File(path);
-		long size = file.length();
-		if (size == 0 || size >= Config.IMAGE_MAX_SIZE ) {
-			return false;
-		}
-		BitmapFactory.Options options = new BitmapFactory.Options();
-		options.inJustDecodeBounds = true;
-		try {
-			BitmapFactory.decodeStream(mXmppConnectionService.getContentResolver().openInputStream(uri), null, options);
-			if (options == null || options.outMimeType == null || options.outHeight <= 0 || options.outWidth <= 0) {
-				return false;
-			}
-			return (options.outWidth <= Config.IMAGE_SIZE && options.outHeight <= Config.IMAGE_SIZE && options.outMimeType.contains(Config.IMAGE_FORMAT.name().toLowerCase()));
-		} catch (FileNotFoundException e) {
-			return false;
-		}
-	}
-
-	public String getOriginalPath(Uri uri) {
-		return FileUtils.getPath(mXmppConnectionService,uri);
-	}
-
-	public void copyFileToPrivateStorage(File file, Uri uri) throws FileCopyException {
+	public static void copyFileToPrivateStorage(File file, Uri uri) throws FileCopyException {
 		file.getParentFile().mkdirs();
 		OutputStream os = null;
 		InputStream is = null;
@@ -160,92 +100,41 @@ public class FileBackend {
 			StreamUtil.close(is);
 		}
 		Logging.d(Config.LOGTAG, "output file name " + file);
-		return file;
 	}
 
-	public void copyFileToPrivateStorage(Message message, Uri uri) throws FileCopyException {
+	public static void copyFileToPrivateStorage(Message message, Uri uri) throws FileCopyException {
 		Log.d(Config.LOGTAG, "copy " + uri.toString() + " to private storage");
-		String mime = mXmppConnectionService.getContentResolver().getType(uri);
+		String mime = ConversationsPlusApplication.getInstance().getContentResolver().getType(uri);
 		String extension = MimeTypeMap.getSingleton().getExtensionFromMimeType(mime);
 		message.setRelativeFilePath(message.getUuid() + "." + extension);
-		copyFileToPrivateStorage(mXmppConnectionService.getFileBackend().getFile(message), uri);
+		copyFileToPrivateStorage(getFile(message), uri);
 	}
 
-	private void copyImageToPrivateStorage(File file, Uri image, int sampleSize) throws FileCopyException {
-		file.getParentFile().mkdirs();
-		InputStream is = null;
-		OutputStream os = null;
-		try {
-			file.createNewFile();
-			is = mXmppConnectionService.getContentResolver().openInputStream(image);
-			Bitmap originalBitmap;
-			BitmapFactory.Options options = new BitmapFactory.Options();
-			int inSampleSize = (int) Math.pow(2, sampleSize);
-			Log.d(Config.LOGTAG, "reading bitmap with sample size " + inSampleSize);
-			options.inSampleSize = inSampleSize;
-			originalBitmap = BitmapFactory.decodeStream(is, null, options);
-			is.close();
-			if (originalBitmap == null) {
-				throw new FileCopyException(R.string.error_not_an_image_file);
-			}
-			Bitmap scaledBitmap = resize(originalBitmap, Config.IMAGE_SIZE);
-			int rotation = getRotation(image);
-			scaledBitmap = rotate(scaledBitmap, rotation);
-			boolean targetSizeReached = false;
-			int quality = Config.IMAGE_QUALITY;
-			while(!targetSizeReached) {
-				os = new FileOutputStream(file);
-				boolean success = scaledBitmap.compress(Config.IMAGE_FORMAT, quality, os);
-				if (!success) {
-					throw new FileCopyException(R.string.error_compressing_image);
-				}
-				os.flush();
-				targetSizeReached = file.length() <= Config.IMAGE_MAX_SIZE || quality <= 50;
-				quality -= 5;
-			}
-			scaledBitmap.recycle();
-			return;
-		} catch (FileNotFoundException e) {
-			throw new FileCopyException(R.string.error_file_not_found);
-		} catch (IOException e) {
-			e.printStackTrace();
-			throw new FileCopyException(R.string.error_io_exception);
-		} catch (SecurityException e) {
-			throw new FileCopyException(R.string.error_security_exception_during_image_copy);
-		} catch (OutOfMemoryError e) {
-			++sampleSize;
-			if (sampleSize <= 3) {
-				copyImageToPrivateStorage(file, image, sampleSize);
-			} else {
-				throw new FileCopyException(R.string.error_out_of_memory);
-			}
-		} catch (NullPointerException e) {
-			throw new FileCopyException(R.string.error_io_exception);
-		} finally {
-			StreamUtil.close(os);
-			StreamUtil.close(is);
-		}
-	}
-
-	public void copyImageToPrivateStorage(File file, Uri image) throws FileCopyException {
-		copyImageToPrivateStorage(file, image, 0);
-	}
-
-	public void copyImageToPrivateStorage(Message message, Uri image) throws FileCopyException {
-		switch(Config.IMAGE_FORMAT) {
-			case JPEG:
-				message.setRelativeFilePath(message.getUuid()+".jpg");
-				break;
-			case PNG:
-				message.setRelativeFilePath(message.getUuid()+".png");
-				break;
-			case WEBP:
-				message.setRelativeFilePath(message.getUuid()+".webp");
-				break;
-		}
-		copyImageToPrivateStorage(getFile(message), image);
-		updateFileParams(message);
-	}
+    public static DownloadableFile compressImageAndCopyToPrivateStorage(Message message, Bitmap scaledBitmap) throws FileCopyException {
+        message.setRelativeFilePath(FileBackend.getPrivateImageDirectoryPath() + message.getUuid() + ".png");
+        DownloadableFile file = getFile(message);
+        file.getParentFile().mkdirs();
+        OutputStream os = null;
+        try {
+            file.createNewFile();
+            os = new FileOutputStream(file);
+
+            boolean success = scaledBitmap.compress(Bitmap.CompressFormat.PNG, 75, os);
+            if (!success) {
+                throw new FileCopyException(R.string.error_compressing_image);
+            }
+            os.flush();
+        } catch (IOException e) {
+            throw new FileCopyException(R.string.error_io_exception, e);
+        } catch (SecurityException e) {
+            throw new FileCopyException(R.string.error_security_exception_during_image_copy);
+        } catch (NullPointerException e) {
+            throw new FileCopyException(R.string.error_io_exception);
+        } finally {
+            StreamUtil.close(os);
+        }
+        return file;
+    }
 
 	public static Uri getTakePhotoUri() {
 		StringBuilder pathBuilder = new StringBuilder();
@@ -253,7 +142,7 @@ public class FileBackend {
 		pathBuilder.append('/');
 		pathBuilder.append("Camera");
 		pathBuilder.append('/');
-		pathBuilder.append("IMG_" + this.imageDateFormat.format(new Date()) + ".jpg");
+		pathBuilder.append("IMG_" + imageDateFormat.format(new Date()) + ".jpg");
 		Uri uri = Uri.parse("file://" + pathBuilder.toString());
 		File file = new File(uri.toString());
 		file.getParentFile().mkdirs();
diff --git a/src/main/java/eu/siacs/conversations/services/AvatarService.java b/src/main/java/eu/siacs/conversations/services/AvatarService.java
index 1308f32b..2a128d24 100644
--- a/src/main/java/eu/siacs/conversations/services/AvatarService.java
+++ b/src/main/java/eu/siacs/conversations/services/AvatarService.java
@@ -88,12 +88,12 @@ public class AvatarService {
 
 	private Bitmap getImpl(final MucOptions.User user, final int size, boolean cachedOnly) {
 		final String KEY = key(user, size);
-		Bitmap avatar = this.mXmppConnectionService.getBitmapCache().get(KEY);
+		Bitmap avatar = ImageUtil.getBitmapFromCache(KEY);
 		if (avatar != null || cachedOnly) {
 			return avatar;
 		}
 		if (user.getAvatar() != null) {
-			avatar = mXmppConnectionService.getFileBackend().getAvatar(user.getAvatar(), size);
+			avatar = AvatarUtil.getAvatar(user.getAvatar(), size);
 		}
 		if (avatar == null) {
 			Contact contact = user.getContact();
@@ -103,7 +103,7 @@ public class AvatarService {
 				avatar = get(user.getName(), size, cachedOnly);
 			}
 		}
-		this.mXmppConnectionService.getBitmapCache().put(KEY, avatar);
+		ImageUtil.addBitmapToCache(KEY, avatar);
 		return avatar;
 	}
 
@@ -282,7 +282,7 @@ public class AvatarService {
 	public void clear(MucOptions.User user) {
 		synchronized (this.sizes) {
 			for (Integer size : sizes) {
-				this.mXmppConnectionService.getBitmapCache().remove(key(user, size));
+				ImageUtil.removeBitmapFromCache(key(user, size));
 			}
 		}
 	}
@@ -358,7 +358,7 @@ public class AvatarService {
 				return true;
 			}
 		} else if (user.getAvatar() != null) {
-			Uri uri = mXmppConnectionService.getFileBackend().getAvatarUri(user.getAvatar());
+			Uri uri = AvatarUtil.getAvatarUri(user.getAvatar());
 			if (drawTile(canvas, uri, left, top, right, bottom)) {
 				return true;
 			}
@@ -371,7 +371,7 @@ public class AvatarService {
 	private boolean drawTile(Canvas canvas, Account account, int left, int top, int right, int bottom) {
 		String avatar = account.getAvatar();
 		if (avatar != null) {
-			Uri uri = mXmppConnectionService.getFileBackend().getAvatarUri(avatar);
+			Uri uri = AvatarUtil.getAvatarUri(avatar);
 			if (uri != null) {
 				if (drawTile(canvas, uri, left, top, right, bottom)) {
 					return true;
@@ -393,8 +393,7 @@ public class AvatarService {
 
 	private boolean drawTile(Canvas canvas, Uri uri, int left, int top, int right, int bottom) {
 		if (uri != null) {
-			Bitmap bitmap = mXmppConnectionService.getFileBackend()
-					.cropCenter(uri, bottom - top, right - left);
+			Bitmap bitmap = ImageUtil.cropCenter(uri, bottom - top, right - left);
 			if (bitmap != null) {
 				drawTile(canvas, bitmap, left, top, right, bottom);
 				return true;
diff --git a/src/main/java/eu/siacs/conversations/services/ContactChooserTargetService.java b/src/main/java/eu/siacs/conversations/services/ContactChooserTargetService.java
index c2a45bf2..f4ccd70b 100644
--- a/src/main/java/eu/siacs/conversations/services/ContactChooserTargetService.java
+++ b/src/main/java/eu/siacs/conversations/services/ContactChooserTargetService.java
@@ -51,7 +51,7 @@ public class ContactChooserTargetService extends ChooserTargetService implements
 			for(int i = 0; i < Math.min(conversations.size(),MAX_TARGETS); ++i) {
 				final Conversation conversation = conversations.get(i);
 				final String name = conversation.getName();
-				final Icon icon = Icon.createWithBitmap(mXmppConnectionService.getAvatarService().get(conversation, pixel));
+				final Icon icon = Icon.createWithBitmap(AvatarService.getInstance().get(conversation, pixel));
 				final float score = (1.0f / MAX_TARGETS) * i;
 				final Bundle extras = new Bundle();
 				extras.putString("uuid", conversation.getUuid());
diff --git a/src/main/java/eu/siacs/conversations/services/NotificationService.java b/src/main/java/eu/siacs/conversations/services/NotificationService.java
index 5a50a8df..fd5e4aeb 100644
--- a/src/main/java/eu/siacs/conversations/services/NotificationService.java
+++ b/src/main/java/eu/siacs/conversations/services/NotificationService.java
@@ -35,6 +35,7 @@ import java.util.regex.Pattern;
 import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
 import de.thedevstack.conversationsplus.utils.ImageUtil;
+import de.thedevstack.conversationsplus.utils.MessageUtil;
 import de.tzur.conversations.Settings;
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.R;
@@ -474,23 +475,7 @@ public class NotificationService {
 	}
 
 	private boolean wasHighlightedOrPrivate(final Message message) {
-		final String nick = message.getConversation().getMucOptions().getActualNick();
-		final Pattern highlight = generateNickHighlightPattern(nick);
-		if (message.getBody() == null || nick == null) {
-			return false;
-		}
-		final Matcher m = highlight.matcher(message.getBody());
-		return (m.find() || message.getType() == Message.TYPE_PRIVATE);
-	}
-
-	private static Pattern generateNickHighlightPattern(final String nick) {
-		// We expect a word boundary, i.e. space or start of string, followed by
-		// the
-		// nick (matched in case-insensitive manner), followed by optional
-		// punctuation (for example "bob: i disagree" or "how are you alice?"),
-		// followed by another word boundary.
-		return Pattern.compile("\\b" + Pattern.quote(nick) + "\\p{Punct}?\\b",
-				Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
+		return MessageUtil.wasHighlightedOrPrivate(message);
 	}
 
 	public void setOpenConversation(final Conversation conversation) {
diff --git a/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java b/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
index 09a409fc..335f79c9 100644
--- a/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
+++ b/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
@@ -64,6 +64,7 @@ import de.thedevstack.android.logcat.Logging;
 import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
 import de.thedevstack.conversationsplus.exceptions.FileCopyException;
+import de.thedevstack.conversationsplus.utils.AvatarUtil;
 import de.thedevstack.conversationsplus.utils.FileHelper;
 import de.thedevstack.conversationsplus.utils.ImageUtil;
 import de.thedevstack.conversationsplus.utils.MessageUtil;
@@ -136,12 +137,10 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 
 	public static final String ACTION_CLEAR_NOTIFICATION = "clear_notification";
 	public static final String ACTION_DISABLE_FOREGROUND = "disable_foreground";
-	private static final String ACTION_MERGE_PHONE_CONTACTS = "merge_phone_contacts";
 	public static final String ACTION_TRY_AGAIN = "try_again";
 	public static final String ACTION_DISABLE_ACCOUNT = "disable_account";
 	private static final String ACTION_MERGE_PHONE_CONTACTS = "merge_phone_contacts";
 	private final SerialSingleThreadExecutor mFileAddingExecutor = new SerialSingleThreadExecutor();
-	private final SerialSingleThreadExecutor mDatabaseExecutor = new SerialSingleThreadExecutor();
 	private final IBinder mBinder = new XmppConnectionBinder();
 	private final List<Conversation> conversations = new CopyOnWriteArrayList<>();
 	private final IqGenerator mIqGenerator = new IqGenerator(this);
@@ -157,7 +156,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 			startService(intent);
 		}
 	};
-	private FileBackend fileBackend = new FileBackend(this);
 	private MemorizingTrustManager mMemorizingTrustManager;
 	private NotificationService mNotificationService = new NotificationService(
 			this);
@@ -209,7 +207,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	};
 	private HttpConnectionManager mHttpConnectionManager = new HttpConnectionManager(
 			this);
-	private AvatarService mAvatarService = new AvatarService(this);
 	private MessageArchiveService mMessageArchiveService = new MessageArchiveService(this);
 	private OnConversationUpdate mOnConversationUpdate = null;
 	private final FileObserver fileObserver = new FileObserver(
@@ -341,10 +338,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 
 	private boolean mRestoredFromDatabase = false;
 
-	private static String generateFetchKey(Account account, final Avatar avatar) {
-		return account.getJid().toBareJid() + "_" + avatar.owner + "_" + avatar.sha1sum;
-	}
-
 	public boolean areMessagesInitialized() {
 		return this.mRestoredFromDatabase;
 	}
@@ -360,15 +353,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		} else {
 			return null;
 		}
-
-	}
-
-	public FileBackend getFileBackend() {
-		return this.fileBackend;
-	}
-
-	public AvatarService getAvatarService() {
-		return this.mAvatarService;
 	}
 
 	public void attachLocationToConversation(final Conversation conversation,
@@ -429,40 +413,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 	}
 
-	public void attachImageToConversation(final Conversation conversation, final Uri uri, final UiCallback<Message> callback) {
-		final String compressPictures = getCompressPicturesPreference();
-		if ("never".equals(compressPictures)
-				|| ("auto".equals(compressPictures) && getFileBackend().useImageAsIs(uri))) {
-			Log.d(Config.LOGTAG,conversation.getAccount().getJid().toBareJid()+ ": not compressing picture. sending as file");
-			attachFileToConversation(conversation, uri, callback);
-			return;
-		}
-		final Message message;
-		if (conversation.getNextEncryption() == Message.ENCRYPTION_PGP) {
-			message = new Message(conversation, "", Message.ENCRYPTION_DECRYPTED);
-		} else {
-			message = new Message(conversation, "", conversation.getNextEncryption());
-		}
-		message.setCounterpart(conversation.getNextCounterpart());
-		message.setType(Message.TYPE_IMAGE);
-		mFileAddingExecutor.execute(new Runnable() {
-
-			@Override
-			public void run() {
-				try {
-					getFileBackend().copyImageToPrivateStorage(message, uri);
-					if (conversation.getNextEncryption() == Message.ENCRYPTION_PGP) {
-						getPgpEngine().encrypt(message, callback);
-					} else {
-						callback.success(message);
-					}
-				} catch (final FileBackend.FileCopyException e) {
-					callback.error(e.getResId(), message);
-				}
-			}
-		});
-	}
-
 	public Conversation find(Bookmark bookmark) {
 		return find(bookmark.getAccount(), bookmark.getJid());
 	}
@@ -1000,11 +950,11 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	private void sendUnsentMessages(final Conversation conversation) {
 		conversation.findWaitingMessages(new Conversation.OnMessageFound() {
 
-			@Override
-			public void onMessageFound(Message message) {
-				resendMessage(message, true);
-			}
-		});
+            @Override
+            public void onMessageFound(Message message) {
+                resendMessage(message, true);
+            }
+        });
 	}
 
 	public void resendMessage(final Message message, final boolean delay) {
@@ -1227,19 +1177,19 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 			}
 		}
 		Collections.sort(list, new Comparator<Conversation>() {
-			@Override
-			public int compare(Conversation lhs, Conversation rhs) {
-				Message left = lhs.getLatestMessage();
-				Message right = rhs.getLatestMessage();
-				if (left.getTimeSent() > right.getTimeSent()) {
-					return -1;
-				} else if (left.getTimeSent() < right.getTimeSent()) {
-					return 1;
-				} else {
-					return 0;
-				}
-			}
-		});
+            @Override
+            public int compare(Conversation lhs, Conversation rhs) {
+                Message left = lhs.getLatestMessage();
+                Message right = rhs.getLatestMessage();
+                if (left.getTimeSent() > right.getTimeSent()) {
+                    return -1;
+                } else if (left.getTimeSent() < right.getTimeSent()) {
+                    return 1;
+                } else {
+                    return 0;
+                }
+            }
+        });
 	}
 
 	public void loadMoreMessages(final Conversation conversation, final long timestamp, final OnMoreMessagesLoaded callback) {
@@ -1512,7 +1462,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 					databaseBackend.deleteAccount(account);
 				}
 			};
-			ConversationsPlusApplication.executeDatabaseOperation.execute(runnable);
+			ConversationsPlusApplication.executeDatabaseOperation(runnable);
 			this.accounts.remove(account);
 			updateAccountUi();
 			getNotificationService().updateErrorNotification();
@@ -2188,9 +2138,9 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		final Account account = conversation.getAccount();
 		final Session otrSession = conversation.getOtrSession();
 		Logging.d(Config.LOGTAG,
-				account.getJid().toBareJid() + " otr session established with "
-						+ conversation.getJid() + "/"
-						+ otrSession.getSessionID().getUserID());
+                account.getJid().toBareJid() + " otr session established with "
+                        + conversation.getJid() + "/"
+                        + otrSession.getSessionID().getUserID());
 		conversation.findUnsentMessagesWithEncryption(Message.ENCRYPTION_OTR, new Conversation.OnMessageFound() {
 
 			@Override
@@ -2228,7 +2178,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 			packet.setFrom(account.getJid());
 			MessageGenerator.addMessageHints(packet);
 			packet.setAttribute("to", otrSession.getSessionID().getAccountID() + "/"
-					+ otrSession.getSessionID().getUserID());
+                    + otrSession.getSessionID().getUserID());
 			try {
 				packet.setBody(otrSession
 						.transformSending(CryptoHelper.FILETRANSFER
@@ -2266,221 +2216,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 	}
 
-	public void publishAvatar(final Account account,
-							  final Uri image,
-							  final UiCallback<Avatar> callback) {
-		final Bitmap.CompressFormat format = Config.AVATAR_FORMAT;
-		final int size = Config.AVATAR_SIZE;
-		final Avatar avatar = getFileBackend().getPepAvatar(image, size, format);
-		if (avatar != null) {
-			avatar.height = size;
-			avatar.width = size;
-			if (format.equals(Bitmap.CompressFormat.WEBP)) {
-				avatar.type = "image/webp";
-			} else if (format.equals(Bitmap.CompressFormat.JPEG)) {
-				avatar.type = "image/jpeg";
-			} else if (format.equals(Bitmap.CompressFormat.PNG)) {
-				avatar.type = "image/png";
-			}
-			if (!getFileBackend().save(avatar)) {
-				callback.error(R.string.error_saving_avatar, avatar);
-				return;
-			}
-			final IqPacket packet = this.mIqGenerator.publishAvatar(avatar);
-			this.sendIqPacket(account, packet, new OnIqPacketReceived() {
-
-				@Override
-				public void onIqPacketReceived(Account account, IqPacket result) {
-					if (result.getType() == IqPacket.TYPE.RESULT) {
-						final IqPacket packet = XmppConnectionService.this.mIqGenerator
-								.publishAvatarMetadata(avatar);
-						sendIqPacket(account, packet, new OnIqPacketReceived() {
-							@Override
-							public void onIqPacketReceived(Account account, IqPacket result) {
-								if (result.getType() == IqPacket.TYPE.RESULT) {
-									if (account.setAvatar(avatar.getFilename())) {
-										getAvatarService().clear(account);
-										databaseBackend.updateAccount(account);
-									}
-									callback.success(avatar);
-								} else {
-									callback.error(
-											R.string.error_publish_avatar_server_reject,
-											avatar);
-								}
-							}
-						});
-					} else {
-						callback.error(
-								R.string.error_publish_avatar_server_reject,
-								avatar);
-					}
-				}
-			});
-		} else {
-			callback.error(R.string.error_publish_avatar_converting, null);
-		}
-	}
-
-	public void fetchAvatar(Account account, Avatar avatar) {
-		fetchAvatar(account, avatar, null);
-	}
-
-	public void fetchAvatar(Account account, final Avatar avatar, final UiCallback<Avatar> callback) {
-		final String KEY = generateFetchKey(account, avatar);
-		synchronized (this.mInProgressAvatarFetches) {
-			if (this.mInProgressAvatarFetches.contains(KEY)) {
-				return;
-			} else {
-				switch (avatar.origin) {
-					case PEP:
-						this.mInProgressAvatarFetches.add(KEY);
-						fetchAvatarPep(account, avatar, callback);
-						break;
-					case VCARD:
-						this.mInProgressAvatarFetches.add(KEY);
-						fetchAvatarVcard(account, avatar, callback);
-						break;
-				}
-			}
-		}
-	}
-
-	private void fetchAvatarPep(Account account, final Avatar avatar, final UiCallback<Avatar> callback) {
-		IqPacket packet = this.mIqGenerator.retrievePepAvatar(avatar);
-		sendIqPacket(account, packet, new OnIqPacketReceived() {
-
-			@Override
-			public void onIqPacketReceived(Account account, IqPacket result) {
-				synchronized (mInProgressAvatarFetches) {
-					mInProgressAvatarFetches.remove(generateFetchKey(account, avatar));
-				}
-				final String ERROR = account.getJid().toBareJid()
-						+ ": fetching avatar for " + avatar.owner + " failed ";
-				if (result.getType() == IqPacket.TYPE.RESULT) {
-					avatar.image = mIqParser.avatarData(result);
-					if (avatar.image != null) {
-						if (getFileBackend().save(avatar)) {
-							if (account.getJid().toBareJid().equals(avatar.owner)) {
-								if (account.setAvatar(avatar.getFilename())) {
-									databaseBackend.updateAccount(account);
-								}
-								getAvatarService().clear(account);
-								updateConversationUi();
-								updateAccountUi();
-							} else {
-								Contact contact = account.getRoster()
-										.getContact(avatar.owner);
-								contact.setAvatar(avatar);
-								getAvatarService().clear(contact);
-								updateConversationUi();
-								updateRosterUi();
-							}
-							if (callback != null) {
-								callback.success(avatar);
-							}
-							Log.d(Config.LOGTAG, account.getJid().toBareJid()
-									+ ": succesfuly fetched pep avatar for " + avatar.owner);
-							return;
-						}
-					} else {
-
-						Log.d(Config.LOGTAG, ERROR + "(parsing error)");
-					}
-				} else {
-					Element error = result.findChild("error");
-					if (error == null) {
-						Log.d(Config.LOGTAG, ERROR + "(server error)");
-					} else {
-						Log.d(Config.LOGTAG, ERROR + error.toString());
-					}
-				}
-				if (callback != null) {
-					callback.error(0, null);
-				}
-
-			}
-		});
-	}
-
-	private void fetchAvatarVcard(final Account account, final Avatar avatar, final UiCallback<Avatar> callback) {
-		IqPacket packet = this.mIqGenerator.retrieveVcardAvatar(avatar);
-		this.sendIqPacket(account, packet, new OnIqPacketReceived() {
-			@Override
-			public void onIqPacketReceived(Account account, IqPacket packet) {
-				synchronized (mInProgressAvatarFetches) {
-					mInProgressAvatarFetches.remove(generateFetchKey(account, avatar));
-				}
-				if (packet.getType() == IqPacket.TYPE.RESULT) {
-					Element vCard = packet.findChild("vCard", "vcard-temp");
-					Element photo = vCard != null ? vCard.findChild("PHOTO") : null;
-					String image = photo != null ? photo.findChildContent("BINVAL") : null;
-					if (image != null) {
-						avatar.image = image;
-						if (getFileBackend().save(avatar)) {
-							Log.d(Config.LOGTAG, account.getJid().toBareJid()
-									+ ": successfully fetched vCard avatar for " + avatar.owner);
-							if (avatar.owner.isBareJid()) {
-								Contact contact = account.getRoster()
-										.getContact(avatar.owner);
-								contact.setAvatar(avatar);
-								getAvatarService().clear(contact);
-								updateConversationUi();
-								updateRosterUi();
-							} else {
-								Conversation conversation = find(account, avatar.owner.toBareJid());
-								if (conversation != null && conversation.getMode() == Conversation.MODE_MULTI) {
-									MucOptions.User user = conversation.getMucOptions().findUser(avatar.owner.getResourcepart());
-									if (user != null) {
-										if (user.setAvatar(avatar)) {
-											getAvatarService().clear(user);
-											updateConversationUi();
-											updateMucRosterUi();
-										}
-									}
-								}
-							}
-						}
-					}
-				}
-			}
-		});
-	}
-
-	public void checkForAvatar(Account account, final UiCallback<Avatar> callback) {
-		IqPacket packet = this.mIqGenerator.retrieveAvatarMetaData(null);
-		this.sendIqPacket(account, packet, new OnIqPacketReceived() {
-
-			@Override
-			public void onIqPacketReceived(Account account, IqPacket packet) {
-				if (packet.getType() == IqPacket.TYPE.RESULT) {
-					Element pubsub = packet.findChild("pubsub",
-							"http://jabber.org/protocol/pubsub");
-					if (pubsub != null) {
-						Element items = pubsub.findChild("items");
-						if (items != null) {
-							Avatar avatar = Avatar.parseMetadata(items);
-							if (avatar != null) {
-								avatar.owner = account.getJid().toBareJid();
-								if (fileBackend.isAvatarCached(avatar)) {
-									if (account.setAvatar(avatar.getFilename())) {
-										databaseBackend.updateAccount(account);
-									}
-									getAvatarService().clear(account);
-									callback.success(avatar);
-								} else {
-									fetchAvatarPep(account, avatar, callback);
-								}
-								return;
-							}
-						}
-					}
-				}
-				callback.error(0, null);
-			}
-		});
-	}
-
 	public void deleteContactOnServer(Contact contact) {
 		contact.resetOption(Contact.Options.PREEMPTIVE_GRANT);
 		contact.resetOption(Contact.Options.DIRTY_PUSH);
@@ -2739,7 +2474,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 					}
 				}
 			};
-			ConversationsPlusApplication.executeDatabaseOperation.execute(runnable);
+			ConversationsPlusApplication.executeDatabaseOperation(runnable);
 		}
 		updateUnreadCountBadge();
 	}
@@ -2963,7 +2698,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 				databaseBackend.deleteMessagesInConversation(conversation);
 			}
 		};
-		ConversationsPlusPreferences.dontTrustSystemCAs().execute(runnable);
+		ConversationsPlusApplication.executeDatabaseOperation(runnable);
 	}
 
 	public void sendBlockRequest(final Blockable blockable) {
@@ -3022,6 +2757,10 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		void onMoreMessagesLoaded(int count, Conversation conversation);
 
 		void informUser(int r);
+
+        void setLoadingInProgress();
+
+        boolean isLoadingInProgress();
 	}
 
 	public interface OnAccountPasswordChanged {
diff --git a/src/main/java/eu/siacs/conversations/ui/ConferenceDetailsActivity.java b/src/main/java/eu/siacs/conversations/ui/ConferenceDetailsActivity.java
index e42d3e61..f6426ff2 100644
--- a/src/main/java/eu/siacs/conversations/ui/ConferenceDetailsActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/ConferenceDetailsActivity.java
@@ -511,7 +511,7 @@ public class ConferenceDetailsActivity extends XmppActivity implements OnConvers
 			account = mConversation.getAccount().getJid().toBareJid().toString();
 		}
 		mAccountJid.setText(getString(R.string.using_account, account));
-		mYourPhoto.setImageBitmap(avatarService().get(mConversation.getAccount(), getPixel(48)));
+		mYourPhoto.setImageBitmap(AvatarService.getInstance().get(mConversation.getAccount(), getPixel(48)));
 		setTitle(mConversation.getName());
 		mFullJid.setText(mConversation.getJid().toBareJid().toString());
 		mYourNick.setText(mucOptions.getActualNick());
@@ -601,7 +601,7 @@ public class ConferenceDetailsActivity extends XmppActivity implements OnConvers
 
 			}
 			ImageView iv = (ImageView) view.findViewById(R.id.contact_photo);
-			iv.setImageBitmap(avatarService().get(user, getPixel(48), false));
+			iv.setImageBitmap(AvatarService.getInstance().get(user, getPixel(48), false));
 			membersView.addView(view);
 			if (mConversation.getMucOptions().canInvite()) {
 				mInviteButton.setVisibility(View.VISIBLE);
diff --git a/src/main/java/eu/siacs/conversations/ui/ContactDetailsActivity.java b/src/main/java/eu/siacs/conversations/ui/ContactDetailsActivity.java
index 2a8bb1ce..1fb13d4e 100644
--- a/src/main/java/eu/siacs/conversations/ui/ContactDetailsActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/ContactDetailsActivity.java
@@ -46,6 +46,7 @@ import eu.siacs.conversations.crypto.axolotl.XmppAxolotlSession;
 import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.entities.ListItem;
+import eu.siacs.conversations.services.AvatarService;
 import eu.siacs.conversations.services.XmppConnectionService.OnAccountUpdate;
 import eu.siacs.conversations.services.XmppConnectionService.OnRosterUpdate;
 import eu.siacs.conversations.utils.CryptoHelper;
diff --git a/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java b/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java
index 1f163b82..4033d71f 100644
--- a/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java
@@ -1346,14 +1346,49 @@ public class ConversationActivity extends XmppActivity
 
 			}
 		} else {
-			if (requestCode == ATTACHMENT_CHOICE_TAKE_PHOTO) {
-				mPendingImageUri = null;
-			}
-		}
-	}
+            mPendingImageUris.clear();
+            mPendingFileUris.clear();
+            if (requestCode == ConversationActivity.REQUEST_DECRYPT_PGP) {
+                mConversationFragment.onActivityResult(requestCode, resultCode, data);
+            }
+            if (requestCode == REQUEST_BATTERY_OP) {
+                setNeverAskForBatteryOptimizationsAgain();
+            }
+		}
+	}
+
+    private void setNeverAskForBatteryOptimizationsAgain() {
+        getPreferences().edit().putBoolean("show_battery_optimization", false).commit();
+    }
+
+    private void openBatteryOptimizationDialogIfNeeded() {
+        if (showBatteryOptimizationWarning() && getPreferences().getBoolean("show_battery_optimization", true)) {
+            AlertDialog.Builder builder = new AlertDialog.Builder(this);
+            builder.setTitle(R.string.battery_optimizations_enabled);
+            builder.setMessage(R.string.battery_optimizations_enabled_dialog);
+            builder.setPositiveButton(R.string.next, new OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialog, int which) {
+                    Intent intent = new Intent(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS);
+                    Uri uri = Uri.parse("package:" + getPackageName());
+                    intent.setData(uri);
+                    startActivityForResult(intent, REQUEST_BATTERY_OP);
+                }
+            });
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
+                builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
+                    @Override
+                    public void onDismiss(DialogInterface dialog) {
+                        setNeverAskForBatteryOptimizationsAgain();
+                    }
+                });
+            }
+            builder.create().show();
+        }
+    }
 
 	private void attachLocationToConversation(Conversation conversation, Uri uri) {
-		xmppConnectionService.attachLocationToConversation(conversation,uri, new UiCallback<Message>() {
+		xmppConnectionService.attachLocationToConversation(conversation, uri, new UiCallback<Message>() {
 
 			@Override
 			public void success(Message message) {
@@ -1402,28 +1437,9 @@ public class ConversationActivity extends XmppActivity
 		if (conversation == null) {
 			return;
 		}
-		final Toast prepareFileToast = Toast.makeText(getApplicationContext(),getText(R.string.preparing_image), Toast.LENGTH_LONG);
-		prepareFileToast.show();
-		xmppConnectionService.attachImageToConversation(conversation, uri,
-				new UiCallback<Message>() {
-
-					@Override
-					public void userInputRequried(PendingIntent pi, Message object) {
-						hidePrepareFileToast(prepareFileToast);
-					}
-
-					@Override
-					public void success(Message message) {
-						hidePrepareFileToast(prepareFileToast);
-						xmppConnectionService.sendMessage(message);
-					}
-
-					@Override
-					public void error(int error, Message message) {
-						hidePrepareFileToast(prepareFileToast);
-						displayErrorDialog(error);
-					}
-				});
+        ResizePictureUserDecisionListener userDecisionListener = new ResizePictureUserDecisionListener(this, conversation, uri, xmppConnectionService);
+        UserDecisionDialog userDecisionDialog = new UserDecisionDialog(this, R.string.userdecision_question_resize_picture, userDecisionListener);
+        userDecisionDialog.decide(ConversationsPlusPreferences.resizePicture());
 	}
 
 	private void hidePrepareFileToast(final Toast prepareFileToast) {
@@ -1483,10 +1499,6 @@ public class ConversationActivity extends XmppActivity
 				});
 	}
 
-	public boolean useSendButtonToIndicateStatus() {
-		return getPreferences().getBoolean("send_button_status", false);
-	}
-
 	public boolean indicateReceived() {
 		return getPreferences().getBoolean("indicate_received", false);
 	}
diff --git a/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java b/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
index 568189a8..cf663ebd 100644
--- a/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
+++ b/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
@@ -130,94 +130,6 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 	private TextView snackbarAction;
 	private boolean messagesLoaded = true;
 	private Toast messageLoaderToast;
-
-	private OnScrollListener mOnScrollListener = new OnScrollListener() {
-
-		@Override
-		public void onScrollStateChanged(AbsListView view, int scrollState) {
-			// TODO Auto-generated method stub
-
-		}
-
-		private int getIndexOf(String uuid, List<Message> messages) {
-			if (uuid == null) {
-				return 0;
-			}
-			for(int i = 0; i < messages.size(); ++i) {
-				if (uuid.equals(messages.get(i).getUuid())) {
-					return i;
-				} else {
-					Message next = messages.get(i);
-					while(next != null && next.wasMergedIntoPrevious()) {
-						if (uuid.equals(next.getUuid())) {
-							return i;
-						}
-						next = next.next();
-					}
-
-				}
-			}
-			return 0;
-		}
-
-		@Override
-		public void onScroll(AbsListView view, int firstVisibleItem,
-							 int visibleItemCount, int totalItemCount) {
-			synchronized (ConversationFragment.this.messageList) {
-				if (firstVisibleItem < 5 && messagesLoaded && messageList.size() > 0) {
-					long timestamp = ConversationFragment.this.messageList.get(0).getTimeSent();
-					messagesLoaded = false;
-					activity.xmppConnectionService.loadMoreMessages(conversation, timestamp, new XmppConnectionService.OnMoreMessagesLoaded() {
-						@Override
-						public void onMoreMessagesLoaded(final int c, Conversation conversation) {
-							if (ConversationFragment.this.conversation != conversation) {
-								return;
-							}
-							activity.runOnUiThread(new Runnable() {
-								@Override
-								public void run() {
-									final int oldPosition = messagesView.getFirstVisiblePosition();
-									Message message = messageList.get(oldPosition);
-									String uuid = message != null ? message.getUuid() : null;
-									View v = messagesView.getChildAt(0);
-									final int pxOffset = (v == null) ? 0 : v.getTop();
-									ConversationFragment.this.conversation.populateWithMessages(ConversationFragment.this.messageList);
-									updateStatusMessages();
-									messageListAdapter.notifyDataSetChanged();
-									int pos = getIndexOf(uuid,messageList);
-									messagesView.setSelectionFromTop(pos, pxOffset);
-									messagesLoaded = true;
-									if (messageLoaderToast != null) {
-										messageLoaderToast.cancel();
-									}
-								}
-							});
-						}
-
-						@Override
-						public void informUser(final int resId) {
-
-							activity.runOnUiThread(new Runnable() {
-								@Override
-								public void run() {
-									if (messageLoaderToast != null) {
-										messageLoaderToast.cancel();
-									}
-									if (ConversationFragment.this.conversation != conversation) {
-										return;
-									}
-									messageLoaderToast = Toast.makeText(activity, resId, Toast.LENGTH_LONG);
-									messageLoaderToast.show();
-								}
-							});
-
-						}
-					});
-
-				}
-			}
-		}
-	};
 	private final int KEYCHAIN_UNLOCK_NOT_REQUIRED = 0;
 	private final int KEYCHAIN_UNLOCK_REQUIRED = 1;
 	private final int KEYCHAIN_UNLOCK_PENDING = 2;
@@ -538,7 +450,6 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 		snackbarAction = (TextView) view.findViewById(R.id.snackbar_action);
 
 		messagesView = (ListView) view.findViewById(R.id.messages_view);
-		messagesView.setOnScrollListener(mOnScrollListener);
 		messagesView.setTranscriptMode(ListView.TRANSCRIPT_MODE_NORMAL);
 		messageListAdapter = new MessageAdapter((ConversationActivity) getActivity(), this.messageList);
 		messageListAdapter.setOnContactPictureClicked(new OnContactPictureClicked() {
@@ -691,8 +602,7 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 			shareIntent.setType("text/plain");
 		} else {
 			shareIntent.putExtra(Intent.EXTRA_STREAM,
-					activity.xmppConnectionService.getFileBackend()
-							.getJingleFileUri(message));
+					FileBackend.getJingleFileUri(message));
 			shareIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
 			String mime = message.getMimeType();
 			if (mime == null) {
@@ -997,9 +907,6 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 					case Presences.AWAY:
 						return R.drawable.ic_send_text_away;
 					case Presences.XA:
-						this.mSendButton
-							.setImageResource(R.drawable.ic_action_send_now_away);
-						break;
 					case Presences.DND:
 						return R.drawable.ic_send_text_dnd;
 					default:
@@ -1133,7 +1040,7 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 		this.mSendButton.setImageResource(getSendButtonImageResource(action, status));
 	}
 
-	protected void updateStatusMessages() {
+	public void updateStatusMessages() {
 		synchronized (this.messageList) {
 			if (conversation.getMode() == Conversation.MODE_SINGLE) {
 				ChatState state = conversation.getIncomingChatState();
diff --git a/src/main/java/eu/siacs/conversations/ui/EditAccountActivity.java b/src/main/java/eu/siacs/conversations/ui/EditAccountActivity.java
index f7d4564f..27394527 100644
--- a/src/main/java/eu/siacs/conversations/ui/EditAccountActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/EditAccountActivity.java
@@ -232,7 +232,7 @@ public class EditAccountActivity extends XmppActivity implements OnAccountUpdate
 		} else if (mInitMode && mAccount != null && mAccount.getStatus() == Account.State.ONLINE) {
 			if (!mFetchingAvatar) {
 				mFetchingAvatar = true;
-				xmppConnectionService.checkForAvatar(mAccount, mAvatarFetchCallback);
+				AvatarService.getInstance().checkForAvatar(mAccount, mAvatarFetchCallback);
 			}
 		} else {
 			updateSaveButton();
@@ -609,7 +609,7 @@ public class EditAccountActivity extends XmppActivity implements OnAccountUpdate
 		}
 		if (!mInitMode) {
 			this.mAvatar.setVisibility(View.VISIBLE);
-			this.mAvatar.setImageBitmap(avatarService().get(this.mAccount, getPixel(72)));
+			this.mAvatar.setImageBitmap(AvatarService.getInstance().get(this.mAccount, getPixel(72)));
 		}
 		if (this.mAccount.isOptionSet(Account.OPTION_REGISTER)) {
 			this.mRegisterNew.setVisibility(View.VISIBLE);
diff --git a/src/main/java/eu/siacs/conversations/ui/PublishProfilePictureActivity.java b/src/main/java/eu/siacs/conversations/ui/PublishProfilePictureActivity.java
index 9f8ac45c..c70499a9 100644
--- a/src/main/java/eu/siacs/conversations/ui/PublishProfilePictureActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/PublishProfilePictureActivity.java
@@ -208,7 +208,7 @@ public class PublishProfilePictureActivity extends XmppActivity {
 			if (this.avatarUri == null) {
 				if (this.account.getAvatar() != null
 						|| this.defaultUri == null) {
-					this.avatar.setImageBitmap(avatarService().get(account, getPixel(192)));
+					this.avatar.setImageBitmap(AvatarService.getInstance().get(account, getPixel(192)));
 					if (this.defaultUri != null) {
 						this.avatar
 								.setOnLongClickListener(this.backToDefaultListener);
@@ -255,10 +255,10 @@ public class PublishProfilePictureActivity extends XmppActivity {
 		options.inJustDecodeBounds = true;
 		BitmapFactory.decodeStream(getContentResolver().openInputStream(uri), null, options);
 		int rotation = ExifHelper.getOrientation(getContentResolver().openInputStream(uri));
-		options.inSampleSize = FileBackend.calcSampleSize(options, reqSize);
+		options.inSampleSize = ImageUtil.calcSampleSize(options, reqSize);
 		options.inJustDecodeBounds = false;
 		Bitmap bm = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri), null, options);
-		return FileBackend.rotate(bm,rotation);
+		return ImageUtil.rotate(bm,rotation);
 	}
 
 	protected void loadImageIntoPreview(Uri uri) {
diff --git a/src/main/java/eu/siacs/conversations/ui/XmppActivity.java b/src/main/java/eu/siacs/conversations/ui/XmppActivity.java
index 3d3207e4..efb498ac 100644
--- a/src/main/java/eu/siacs/conversations/ui/XmppActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/XmppActivity.java
@@ -548,7 +548,7 @@ public abstract class XmppActivity extends Activity {
 		});
 	}
 
-	protected void displayErrorDialog(final int errorCode) {
+	public void displayErrorDialog(final int errorCode) {
 		runOnUiThread(new Runnable() {
 
 			@Override
diff --git a/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java b/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java
index ed2a23d2..3e3bf98b 100644
--- a/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java
+++ b/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java
@@ -592,8 +592,6 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 		} else {
 			if (GeoHelper.isGeoUri(message.getBody())) {
 				displayLocationMessage(viewHolder,message);
-			} else if (message.bodyIsHeart()) {
-				displayHeartMessage(viewHolder, message.getBody().trim());
 			} else if (message.treatAsDownloadable() == Message.Decision.MUST) {
 				displayDownloadableMessage(viewHolder, message, activity.getString(R.string.check_x_filesize, UIHelper.getFileDescriptionString(activity, message)));
 			} else {
@@ -622,7 +620,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 	}
 
 	public void openDownloadable(Message message) {
-		DownloadableFile file = activity.xmppConnectionService.getFileBackend().getFile(message);
+		DownloadableFile file = FileBackend.getFile(message);
 		if (!file.exists()) {
 			Toast.makeText(activity,R.string.file_deleted,Toast.LENGTH_SHORT).show();
 			return;
@@ -694,7 +692,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 
 		@Override
 		protected Bitmap doInBackground(Message... params) {
-			return activity.avatarService().get(params[0], activity.getPixel(48), isCancelled());
+			return AvatarService.getInstance().get(params[0], activity.getPixel(48), isCancelled());
 		}
 
 		@Override
@@ -711,7 +709,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 
 	public void loadAvatar(Message message, ImageView imageView) {
 		if (cancelPotentialWork(message, imageView)) {
-			final Bitmap bm = activity.avatarService().get(message, activity.getPixel(48), true);
+			final Bitmap bm = AvatarService.getInstance().get(message, activity.getPixel(48), true);
 			if (bm != null) {
 				imageView.setImageBitmap(bm);
 				imageView.setBackgroundColor(0x00000000);
diff --git a/src/main/java/eu/siacs/conversations/utils/PhoneHelper.java b/src/main/java/eu/siacs/conversations/utils/PhoneHelper.java
index 774532d1..03adbfcd 100644
--- a/src/main/java/eu/siacs/conversations/utils/PhoneHelper.java
+++ b/src/main/java/eu/siacs/conversations/utils/PhoneHelper.java
@@ -1,6 +1,5 @@
 package eu.siacs.conversations.utils;
 
-import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.RejectedExecutionException;
 
@@ -12,12 +11,11 @@ import android.content.Loader.OnLoadCompleteListener;
 import android.content.pm.PackageManager;
 import android.database.Cursor;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.provider.ContactsContract;
 import android.provider.ContactsContract.Profile;
 
-import de.thedevstack.conversationsplus.ConversationsPlusApplication;
-
 public class PhoneHelper {
 
 	public static void loadPhoneContacts(Context context, final List<Bundle> phoneContacts, final OnPhoneContactsLoadedListener listener) {
diff --git a/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java b/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java
index 11bfdd8d..dbdce8b6 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java
@@ -24,6 +24,7 @@ import de.thedevstack.android.logcat.Logging;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
 import de.thedevstack.conversationsplus.utils.MessageUtil;
 
+import de.thedevstack.conversationsplus.utils.StreamUtil;
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.crypto.axolotl.AxolotlService;
 import eu.siacs.conversations.crypto.axolotl.OnMessageCreatedCallback;