public static boolean backupDatabase() {

    File dbFile = new File(Environment.getDataDirectory() + "/data/" + PKG + "/databases/" + DB_NAME);

    File exportDir = new File(Environment.getExternalStorageDirectory(), "pocket-voa");

    if (!exportDir.exists()) {

        exportDir.mkdirs();

    }

    File file = new File(exportDir, dbFile.getName());

    try {

        file.createNewFile();

        copyFile(dbFile, file);

        return true;

    } catch (IOException e) {

        Log.e(TAG, "[backupDatabase] error", e);

        return false;

    }

}

public static boolean restoreDatabase() {

    File dbFile = new File(Environment.getDataDirectory() + "/data/" + PKG + "/databases/" + DatabaseHelper.DB_NAME);

    File exportDbFile = new File(Environment.getExternalStorageDirectory() + "/pocket-voa/" + DatabaseHelper.DB_NAME);

    if (!exportDbFile.exists())

        return false;

    try {

        dbFile.createNewFile();

        copyFile(exportDbFile, dbFile);

        return true;

    } catch (IOException e) {

        Log.e(TAG, "[restoreDatabase] error", e);

        return false;

    }

}

private static void copyFile(File src, File dst) throws IOException {

    FileChannel inChannel = new FileInputStream(src).getChannel();

    FileChannel outChannel = new FileOutputStream(dst).getChannel();

    try {

        inChannel.transferTo(0, inChannel.size(), outChannel);

    } finally {

        if (inChannel != null)

            inChannel.close();

        if (outChannel != null)

            outChannel.close();

    }

}