Function for fetch sqlite database file from data/data/ folder and copy it to device internal memory

DatabaseHelper.java

public class DatabaseHelper extends SQLiteOpenHelper {    
    /**
     * create a copy of database file from data/data to sdcard
     */
    public static void dbBackup(@NonNull Context context) {
        try {
            String databaseName="myDb.db";
            String outFileName="myDb" + Calendar.getInstance().getTimeInMillis() + ".db";
            //Open your local db as the input stream
            InputStream myInput = new FileInputStream(context.getDatabasePath(databaseName));
            //Open the empty db as the output stream
            OutputStream myOutput = new FileOutputStream(new File(Environment.getExternalStorageDirectory(), outFileName));

            //transfer bytes from the inputfile to the outputfile
            byte[] buffer = new byte[1024];
            int length;
            while ((length = myInput.read(buffer)) > 0) {
                myOutput.write(buffer, 0, length);
            }

            //Close the streams
            myOutput.flush();
            myOutput.close();
            myInput.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}