Executing SQLite queries in background (example for article)

public class MyAsyncTask extends AsyncTask<Void, Void, Cursor> {

    @Override
    protected Cursor doInBackground(Void... params) {
        DatabaseHelper helper = new DatabaseHelper(MainActivity.this);

        return helper.getReadableDatabase().rawQuery("SELECT * FROM myTable", null);
    }

    @Override
    protected void onPostExecute(Cursor cursor) {
        super.onPostExecute(cursor);

        Toast.makeText(
                MainActivity.this,
                "Count: " + cursor.getCount(),
                Toast.LENGTH_SHORT
        ).show();
    }
}