For creating a temporary backup of the database before we restore the database file.

backupDatabaseForRestore.java

public static void backupDatabaseForRestore(Activity activity, Context context) {
        File dbfile = activity.getDatabasePath(DATABASE_NAME);
        File sdir = new File(getFilePath(context, 0), "backup");
        String sfpath = sdir.getPath() + File.separator + BACKUP_RESTORE_ROLLBACK_FILE_NAME;
        if (!sdir.exists()) {
            sdir.mkdirs();
        }
        File savefile = new File(sfpath);
        if (savefile.exists()) {
            Log.d(LOGGER, "Backup Restore - File exists. Deleting it and then creating new file.");
            savefile.delete();
        }
        try {
            if (savefile.createNewFile()) {
                int buffersize = 8 * 1024;
                byte[] buffer = new byte[buffersize];
                int bytes_read = buffersize;
                OutputStream savedb = new FileOutputStream(sfpath);
                InputStream indb = new FileInputStream(dbfile);
                while ((bytes_read = indb.read(buffer, 0, buffersize)) > 0) {
                    savedb.write(buffer, 0, bytes_read);
                }
                savedb.flush();
                indb.close();
                savedb.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
            Log.d(LOGGER, "ex for restore file: " + e);
        }
    }