add database importer

6 files changed, 142 insertions, 5 deletions

diff --git a/build.gradle b/build.gradle
index 4f4d46295..9d144585f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -72,9 +72,9 @@ android {
     defaultConfig {
         minSdkVersion 14
         targetSdkVersion 23
-        versionCode 147
+        versionCode 150
 
-        versionName "1.13.0"
+        versionName "1.13.1"
         archivesBaseName += "-$versionName"
         applicationId "de.pixart.messenger"
 
diff --git a/src/main/java/eu/siacs/conversations/ui/UpdaterActivity.java b/src/main/java/eu/siacs/conversations/ui/UpdaterActivity.java
index b47b0c1dd..e1e15452f 100644
--- a/src/main/java/eu/siacs/conversations/ui/UpdaterActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/UpdaterActivity.java
@@ -103,11 +103,10 @@ public class UpdaterActivity extends Activity {
     private void ExportDatabase() throws IOException {
 
         // Get hold of the db:
-        InputStream myInput = new
-                FileInputStream(this.getDatabasePath(DatabaseBackend.DATABASE_NAME));
+        InputStream myInput = new FileInputStream(this.getDatabasePath(DatabaseBackend.DATABASE_NAME));
 
         // Set the output folder on the SDcard
-        File directory = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/Pix-Art Messenger/.Database/");
+        File directory = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Pix-Art Messenger/.Database/");
 
         // Create the folder if it doesn't exist:
         if (!directory.exists()) {
diff --git a/src/main/java/eu/siacs/conversations/ui/WelcomeActivity.java b/src/main/java/eu/siacs/conversations/ui/WelcomeActivity.java
index d4e8fa9f6..55bb7140f 100644
--- a/src/main/java/eu/siacs/conversations/ui/WelcomeActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/WelcomeActivity.java
@@ -1,12 +1,26 @@
 package eu.siacs.conversations.ui;
 
 import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
 import android.content.Intent;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteException;
 import android.os.Bundle;
+import android.os.Environment;
 import android.view.View;
 import android.widget.Button;
+import android.widget.TextView;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 
 import eu.siacs.conversations.R;
+import eu.siacs.conversations.persistance.DatabaseBackend;
 
 public class WelcomeActivity extends Activity {
 
@@ -14,6 +28,62 @@ public class WelcomeActivity extends Activity {
 	protected void onCreate(final Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.welcome);
+        boolean dbExist = checkDatabase();
+        boolean backup_existing = false;
+
+        //check if there is a backed up database --
+        if (dbExist) {
+            //copy db from public storage to private storage
+            backup_existing = true;
+        } else {
+            //if copy fails, show dialog
+            AlertDialog.Builder builder = new AlertDialog.Builder(this);
+            builder.setMessage(R.string.import_failed)
+                    .setCancelable(false)
+                    .setPositiveButton(R.string.create_account, new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int id) {
+                            Intent intent = new Intent(WelcomeActivity.this, MagicCreateActivity.class);
+                            intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
+                            startActivity(intent);
+                        }
+                    })
+                    .setNegativeButton(R.string.use_existing_accout, new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int id) {
+                            startActivity(new Intent(WelcomeActivity.this, EditAccountActivity.class));
+                        }
+                    });
+            AlertDialog alert = builder.create();
+            alert.show();
+            //throw new Error("Error copying database");
+        }
+
+        final Button ImportDatabase = (Button) findViewById(R.id.import_database);
+        final TextView ImportText = (TextView) findViewById(R.id.import_text);
+
+        if (backup_existing) {
+            ImportDatabase.setVisibility(View.VISIBLE);
+            ImportText.setVisibility(View.VISIBLE);
+        }
+
+        ImportDatabase.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                //ToDo add import DB from local storage to system storage and wait until copy is complete
+                try {
+                    ImportDatabase();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+                //ask user to uninstall old eu.siacs.conversations before restart
+
+                //restart app
+                Intent intent = getBaseContext().getPackageManager().getLaunchIntentForPackage(getBaseContext().getPackageName());
+                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                startActivity(intent);
+            }
+        });
+
 		final Button createAccount = (Button) findViewById(R.id.create_account);
 		createAccount.setOnClickListener(new View.OnClickListener() {
 			@Override
@@ -33,4 +103,48 @@ public class WelcomeActivity extends Activity {
 
 	}
 
+    private boolean checkDatabase() {
+
+        SQLiteDatabase checkDB = null;
+        String DB_PATH = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Pix-Art Messenger/.Database/";
+        String DB_NAME = "Database.bak";
+
+        try {
+            String myPath = DB_PATH + DB_NAME;
+            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
+        } catch (SQLiteException e) {
+            //database does't exist yet.
+        }
+
+        if (checkDB != null) {
+            checkDB.close();
+        }
+        return checkDB != null ? true : false;
+    }
+
+    private void ImportDatabase() throws IOException {
+
+        // Set location for the db:
+        OutputStream myOutput = new FileOutputStream(this.getDatabasePath(DatabaseBackend.DATABASE_NAME));
+
+        // Set the folder on the SDcard
+        File directory = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Pix-Art Messenger/.Database/");
+
+        // Set the input file stream up:
+        InputStream myInput = new FileInputStream(directory.getPath() + "/Database.bak");
+
+        // Transfer bytes from the input file to the output file
+        byte[] buffer = new byte[1024];
+        int length;
+        while ((length = myInput.read(buffer)) > 0) {
+            myOutput.write(buffer, 0, length);
+        }
+
+        // Close and clear the streams
+        myOutput.flush();
+        myOutput.close();
+        myInput.close();
+    }
+
+
 }
diff --git a/src/main/res/layout/welcome.xml b/src/main/res/layout/welcome.xml
index 813570759..2fb9667a5 100644
--- a/src/main/res/layout/welcome.xml
+++ b/src/main/res/layout/welcome.xml
@@ -43,6 +43,26 @@
                 android:textColor="@color/black87"
                 android:textSize="?attr/TextSizeBody" />
 
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="8dp"
+                android:text="@string/import_text"
+                android:textColor="@color/black87"
+                android:textSize="?attr/TextSizeBody"
+                android:visibility="gone"
+                android:id="@id/import_text" />
+
+            <Button
+                android:id="@+id/import_database"
+                style="?android:attr/borderlessButtonStyle"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="right"
+                android:text="@string/import_database"
+                android:textColor="@color/accent"
+                android:visibility="gone" />
+
             <Button
                 android:id="@+id/create_account"
                 style="?android:attr/borderlessButtonStyle"
diff --git a/src/main/res/values/ids.xml b/src/main/res/values/ids.xml
index 75f75673b..0786006cf 100644
--- a/src/main/res/values/ids.xml
+++ b/src/main/res/values/ids.xml
@@ -3,4 +3,5 @@
     <item name="snackbar_location_message" type="id" />
     <item name="message_image_view" type="id" />
     <item name="message_video_view" type="id" />
+    <item name="import_text" type="id" />
 </resources>
\ No newline at end of file
diff --git a/src/main/res/values/strings.xml b/src/main/res/values/strings.xml
index f25918008..b71122003 100644
--- a/src/main/res/values/strings.xml
+++ b/src/main/res/values/strings.xml
@@ -642,5 +642,8 @@
 	<string name="conference_subject">Subject</string>
 	<string name="choose_participants">Choose participants</string>
 	<string name="creating_conference">Creating conference…</string>
+	<string name="import_text">There is a backup on your device. Shall the backup be imported?</string>
+	<string name="import_database">import backup</string>
+	<string name="import_failed">The import has failed</string>
 
 </resources>