How To Show Progress Dialog (in Separate Thread?) While Processing Some Code In Main Thread

I need to do the following: when app is started it runs an activity (splashActivity) which tries to create an DBHelper (SQLiteDatabase) instance which at creation time checks if d

Solution 1:

Try to declare AsyncTask as an inner class for the activity, instantiate and execute it there. I think the problem is in context given to ProgressDialog when you are creating it, your logic for doing this is too complicated. Declaring AsyncTask in activity is more common practice.

Then, AsyncTask must do all you need with DB in doInBackground method

public class SplashActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.splash);

        new RestoreDBTask().execute();
    }

}

private class RestoreDBTask extends AsyncTask <Void, Void, String>
{
    private ProgressDialog dialog;

    @Override
    protected void onPreExecute()
    {
        dialog = ProgressDialog.show(
            SplashActivity.this,
            getString(R.string.progress_wait),
            getString(R.string.progress_db_installing), 
            true);
    }

    @Override
    protected String doInBackground(Void... params)
    {
        // do all the things with DB
        DBHelper dbHelper = new DBHelper(SplashActivity.this);
        dbHelper.close();
        return "";
    }

    @Override
    protected void onPostExecute(String result)
    {
        dialog.dismiss();
    }
}