How to perform database operations using Async Task

Question

My application is getting stuck while performing database operation after googling for solutions it was suggested that I use AsyncTask so that main thread doesn\'t get block

Answer 1

In your Actvity add the following code, do the required changes,

private class GetContacts extends AsyncTask<Object, Object, Cursor> {
    DatabaseConnector dbConnector = new DatabaseConnector(
            getApplicationContext());

    @Override
    protected Cursor doInBackground(Object... params) {
        dbConnector.open();
        if (dbConnector.getAllValues() != null) {
            return dbConnector.getAllValues();
        } else
            return null;
    }

    @Override
    protected void onPostExecute(Cursor result) {
        if (result != null) {
            conAdapter.changeCursor(result); // set the adapter's Cursor
            dbConnector.close();
        }
    }
}

execute this by new GetContacts().execute((Object[]) null);

Answer 2

No, you can't extend a class from multiple classes as it violates the property of java because java doesn't support multiple inheritence so for your case you have to create a new class which will extend ASyncTask and override the abstract methods to perform all the database related operations. Thank you