Question

I have two activities. While switching to second activity by intent, it takes 3-4 seconds because it has lots of components with adapters fetching data from SQLite etc. Thus, I want to show a progress dialog while switching.

I have been digging topics for this purpose and tried many of them:

1-) Using AsyncTask on the second activity. It doesn’t show the progress dialog as soon as I click on a component to switch to the second activity. It waits for 3-4 seconds and then progress dialog shows up for less then a second which is not user-friendly way.

2-) Using AsyncTask on the first activity. It shows as soon as I click on that component but the progress wheel doesn’t spin. The progress dialog freezes.

3-) Using AsyncTask onStart() method on the second activity. This results as the first way.

The code below implements the second way above, using AsyncTask on the first activity.

public void toVisitRegister(Event event) { //Switching to the second activity
    new startingThread().execute();
    Intent toVisitRegister = new Intent(MainCalendar.this, VisitRegister.class);
    startActivity(toVisitRegister);
    finish();
}

And here is the AsyncTask

public class startingThread extends AsyncTask<String, String, String> { 
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        startingProgress = new ProgressDialog(MainCalendar.this);
        startingProgress.setTitle("Visit Register");
        startingProgress.setMessage("Initializing...");
        startingProgress.show();
        }

    @Override
    protected String doInBackground(String... params) {
        return null;
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        if(MainCalendar.this.startingProgress != null) {
            MainCalendar.this.startingProgress.dismiss();
        }
    }
}

I also tried to call startActivity in onPostExecute, but it didn’t work. Therefore, I am waiting for your opinions and suggessions about this issue. Any help will be appreciated.

Thanks.

Answer 1

I also tried to call startActivity in onPostExecute,

Pass the Activity context to startingThread AsyncTask and put your start activity code in onPostExecute() of AsyncTask.

@Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        if(MainCalendar.this.startingProgress != null) {
            MainCalendar.this.startingProgress.dismiss();
            Intent toVisitRegister = new Intent(MainCalendar.this, VisitRegister.class);
            mContext.startActivity(toVisitRegister);
            mContext.finish();
        }
    }

Here mContext is the Context of your current MainCalendar Activity.