introduce preview for PDF files in chat

3 files changed, 79 insertions, 19 deletions

diff --git a/src/main/java/de/pixart/messenger/persistance/FileBackend.java b/src/main/java/de/pixart/messenger/persistance/FileBackend.java
index babc7f888..fb095502a 100644
--- a/src/main/java/de/pixart/messenger/persistance/FileBackend.java
+++ b/src/main/java/de/pixart/messenger/persistance/FileBackend.java
@@ -14,6 +14,7 @@ import android.graphics.Matrix;
 import android.graphics.Paint;
 import android.graphics.RectF;
 import android.graphics.drawable.Drawable;
+import android.graphics.pdf.PdfRenderer;
 import android.media.MediaMetadataRetriever;
 import android.media.MediaScannerConnection;
 import android.net.Uri;
@@ -63,6 +64,7 @@ import de.pixart.messenger.entities.Message;
 import de.pixart.messenger.services.AttachFileToConversationRunnable;
 import de.pixart.messenger.services.XmppConnectionService;
 import de.pixart.messenger.ui.util.Attachment;
+import de.pixart.messenger.utils.Compatibility;
 import de.pixart.messenger.utils.CryptoHelper;
 import de.pixart.messenger.utils.ExifHelper;
 import de.pixart.messenger.utils.FileUtils;
@@ -651,7 +653,9 @@ public class FileBackend {
                 final String mime = file.getMimeType();
                 if (mime.startsWith("video/")) {
                     thumbnail = getVideoPreview(file, size);
-                } else {
+                } else if ((mime.contains("pdf")) && Compatibility.runsTwentyOne()) {
+                    thumbnail = getPDFPreview(file, size);
+                } else if (mime.startsWith("image/")) {
                     Bitmap fullsize = getFullsizeImagePreview(file, size);
                     if (fullsize == null) {
                         throw new FileNotFoundException();
@@ -671,6 +675,32 @@ public class FileBackend {
         return thumbnail;
     }
 
+    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
+    private Bitmap getPDFPreview(DownloadableFile file, int size) {
+        try {
+            ParcelFileDescriptor mFileDescriptor = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
+            if (mFileDescriptor == null) {
+                return null;
+            }
+            PdfRenderer renderer = new PdfRenderer(mFileDescriptor);
+            PdfRenderer.Page page = renderer.openPage(0);
+            int width = page.getWidth();
+            int height = page.getHeight();
+            Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
+            bitmap.eraseColor(Color.WHITE);
+            page.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
+            drawOverlay(bitmap, R.drawable.show_pdf, 0.75f);
+            page.close();
+            renderer.close();
+            return bitmap;
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
     private Bitmap getFullsizeImagePreview(File file, int size) {
         BitmapFactory.Options options = new BitmapFactory.Options();
         options.inSampleSize = calcSampleSize(file, size);
diff --git a/src/main/java/de/pixart/messenger/ui/adapter/MessageAdapter.java b/src/main/java/de/pixart/messenger/ui/adapter/MessageAdapter.java
index 90582815e..38016229d 100644
--- a/src/main/java/de/pixart/messenger/ui/adapter/MessageAdapter.java
+++ b/src/main/java/de/pixart/messenger/ui/adapter/MessageAdapter.java
@@ -100,6 +100,7 @@ import static de.pixart.messenger.ui.SettingsActivity.SHOW_LINKS_INSIDE;
 import static de.pixart.messenger.ui.SettingsActivity.SHOW_MAPS_INSIDE;
 import static de.pixart.messenger.ui.util.MyLinkify.removeTrailingBracket;
 import static de.pixart.messenger.ui.util.MyLinkify.replaceYoutube;
+import static de.pixart.messenger.utils.Compatibility.runsTwentyOne;
 
 public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextView.CopyHandler {
 
@@ -674,19 +675,14 @@ public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextVie
 
     private void displayOpenableMessage(ViewHolder viewHolder, final Message message, final boolean darkBackground) {
         toggleWhisperInfo(viewHolder, message, false, darkBackground);
-        viewHolder.audioPlayer.setVisibility(View.GONE);
-        viewHolder.image.setVisibility(View.GONE);
-        viewHolder.gifImage.setVisibility(View.GONE);
-        viewHolder.richlinkview.setVisibility(View.GONE);
-        viewHolder.progressBar.setVisibility(View.GONE);
-        viewHolder.download_button.setVisibility(View.VISIBLE);
         final String mimeType = message.getMimeType();
         if (mimeType != null && message.getMimeType().contains("pdf")) {
-            Drawable icon = activity.getResources().getDrawable(R.drawable.ic_file_pdf_grey600_48dp);
-            Drawable drawable = DrawableCompat.wrap(icon);
-            DrawableCompat.setTint(drawable, StyledAttributes.getColor(getContext(), R.attr.colorAccent));
-            viewHolder.download_button.setCompoundDrawablesWithIntrinsicBounds(drawable, null, null, null);
-            viewHolder.download_button.setText(activity.getString(R.string.open_x_file, UIHelper.getFileDescriptionString(activity, message)));
+            try {
+                showPDF(message, viewHolder, false);
+            } catch (Exception e) {
+                e.printStackTrace();
+                showPDF(message, viewHolder, true);
+            }
         } else if (mimeType != null && message.getMimeType().contains("vcard")) {
             try {
                 showVCard(message, viewHolder);
@@ -733,7 +729,33 @@ public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextVie
         viewHolder.download_button.setOnClickListener(v -> openDownloadable(message));
     }
 
-    private void showAPK(final Message message, ViewHolder viewHolder) {
+    private void showPDF(final Message message, final ViewHolder viewHolder, boolean compat) {
+        if (runsTwentyOne() && !compat) {
+            viewHolder.audioPlayer.setVisibility(View.GONE);
+            viewHolder.image.setVisibility(View.VISIBLE);
+            viewHolder.gifImage.setVisibility(View.GONE);
+            viewHolder.richlinkview.setVisibility(View.GONE);
+            viewHolder.progressBar.setVisibility(View.GONE);
+            viewHolder.download_button.setVisibility(View.GONE);
+            activity.loadBitmap(message, viewHolder.image);
+            viewHolder.image.setOnClickListener(v -> openDownloadable(message));
+        } else {
+            viewHolder.audioPlayer.setVisibility(View.GONE);
+            viewHolder.image.setVisibility(View.GONE);
+            viewHolder.gifImage.setVisibility(View.GONE);
+            viewHolder.richlinkview.setVisibility(View.GONE);
+            viewHolder.progressBar.setVisibility(View.GONE);
+            viewHolder.download_button.setVisibility(View.VISIBLE);
+            Drawable icon = activity.getResources().getDrawable(R.drawable.ic_file_pdf_grey600_48dp);
+            Drawable drawable = DrawableCompat.wrap(icon);
+            DrawableCompat.setTint(drawable, StyledAttributes.getColor(getContext(), R.attr.colorAccent));
+            viewHolder.download_button.setCompoundDrawablesWithIntrinsicBounds(drawable, null, null, null);
+            viewHolder.download_button.setText(activity.getString(R.string.open_x_file, UIHelper.getFileDescriptionString(activity, message)));
+            viewHolder.download_button.setOnClickListener(v -> openDownloadable(message));
+        }
+    }
+
+    private void showAPK(final Message message, final ViewHolder viewHolder) {
         String APKName = "";
         if (message.getFileParams().subject.length() != 0) {
             try {
@@ -769,7 +791,7 @@ public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextVie
         viewHolder.download_button.setText(activity.getString(R.string.open_x_file, UIHelper.getFileDescriptionString(activity, message) + VCardName));
     }
 
-    private void displayRichLinkMessage(ViewHolder viewHolder, final Message message, boolean darkBackground) {
+    private void displayRichLinkMessage(final ViewHolder viewHolder, final Message message, boolean darkBackground) {
         toggleWhisperInfo(viewHolder, message, true, darkBackground);
         viewHolder.audioPlayer.setVisibility(View.GONE);
         viewHolder.image.setVisibility(View.GONE);
@@ -817,7 +839,7 @@ public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextVie
         }
     }
 
-    private void displayLocationMessage(ViewHolder viewHolder, final Message message, final boolean darkBackground) {
+    private void displayLocationMessage(final ViewHolder viewHolder, final Message message, final boolean darkBackground) {
         toggleWhisperInfo(viewHolder, message, false, darkBackground);
         viewHolder.audioPlayer.setVisibility(View.GONE);
         String url = GeoHelper.MapPreviewUri(message);
@@ -864,7 +886,8 @@ public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextVie
         }
     }
 
-    private void displayAudioMessage(ViewHolder viewHolder, Message message, boolean darkBackground) {
+    private void displayAudioMessage(ViewHolder viewHolder, Message message,
+                                     boolean darkBackground) {
         toggleWhisperInfo(viewHolder, message, showTitle(message), darkBackground);
         viewHolder.image.setVisibility(View.GONE);
         viewHolder.gifImage.setVisibility(View.GONE);
@@ -902,7 +925,8 @@ public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextVie
         return "";
     }
 
-    private void displayImageMessage(ViewHolder viewHolder, final Message message, final boolean darkBackground) {
+    private void displayImageMessage(ViewHolder viewHolder, final Message message,
+                                     final boolean darkBackground) {
         toggleWhisperInfo(viewHolder, message, false, darkBackground);
         viewHolder.download_button.setVisibility(View.GONE);
         viewHolder.audioPlayer.setVisibility(View.GONE);
@@ -968,7 +992,8 @@ public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextVie
         }
     }
 
-    private void toggleWhisperInfo(ViewHolder viewHolder, final Message message, final boolean includeBody, final boolean darkBackground) {
+    private void toggleWhisperInfo(ViewHolder viewHolder, final Message message,
+                                   final boolean includeBody, final boolean darkBackground) {
         SpannableStringBuilder messageBody = new SpannableStringBuilder(replaceYoutube(activity.getApplicationContext(), message.getBody()));
 
         final String mimeType = message.getMimeType();
@@ -1495,7 +1520,8 @@ public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextVie
         }
     }
 
-    public void setBubbleBackgroundColor(final View viewHolder, final int type, final boolean isPrivateMessage, final boolean isInValidSession) {
+    public void setBubbleBackgroundColor(final View viewHolder, final int type,
+                                         final boolean isPrivateMessage, final boolean isInValidSession) {
         if (type == RECEIVED) {
             if (isInValidSession) {
                 if (isPrivateMessage) {
diff --git a/src/main/java/de/pixart/messenger/utils/Compatibility.java b/src/main/java/de/pixart/messenger/utils/Compatibility.java
index b184fdce3..96a72fa23 100644
--- a/src/main/java/de/pixart/messenger/utils/Compatibility.java
+++ b/src/main/java/de/pixart/messenger/utils/Compatibility.java
@@ -40,6 +40,10 @@ public class Compatibility {
         return Build.VERSION.SDK_INT < Build.VERSION_CODES.M || (ContextCompat.checkSelfPermission(context, android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED);
     }
 
+    public static boolean runsTwentyOne() {
+        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP;
+    }
+
     public static boolean runsTwentySix() {
         return Build.VERSION.SDK_INT >= Build.VERSION_CODES.O;
     }