public void backUp() {
    try {
        File sd = Environment.getExternalStorageDirectory();
        File data = Environment.getDataDirectory();

        if (sd.canWrite()) {
            String currentDBPath = "//data//your package     name//databases//dbname.db";
            String backupDBPath = "dbname.db";

            File currentDB = new File(data, currentDBPath);
            File backupDB = new File(sd, backupDBPath);

            Log.d("backupDB path", "" + backupDB.getAbsolutePath());

            if (currentDB.exists()) {
                FileChannel src = new     FileInputStream(currentDB).getChannel();
                FileChannel dst = new FileOutputStream(backupDB).getChannel();
                dst.transferFrom(src, 0, src.size());
                src.close();
                dst.close();
                Toast.makeText(getApplicationContext(), "Backup is successful to SD card", Toast.LENGTH_SHORT).show();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public void restore() {
    try {
        File sd = Environment.getExternalStorageDirectory();
        File data = Environment.getDataDirectory();

        if (sd.canWrite()) {
            String currentDBPath = "//data//your package name//databases//dbname.db";;
            String backupDBPath = "dbname.db";
            File currentDB = new File(data, currentDBPath);
            File backupDB = new File(sd, backupDBPath);

            if (currentDB.exists()) {
                FileChannel src = new FileInputStream(backupDB).getChannel();
                FileChannel dst = new FileOutputStream(currentDB).getChannel();
                dst.transferFrom(src, 0, src.size());
                src.close();
                dst.close();
                Toast.makeText(getApplicationContext(), "Database Restored successfully", Toast.LENGTH_SHORT).show();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}