从MainActivity中关闭AsyncTask中的对话框

Question

In the MainActivity , I have an AsyncTask in which a ProgressDialog is displayed, starting in onPreExecute() . If the processing in the doInBackground() crashes, then I get this exception:
Activity us.nm.state.mmd.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView

I believe it is occurring because the dialog is still being displayed while the activity is going down. The examples of AsyncTask/Progress dialog I see all have the dialog within the AsyncTask class. I would like to try dismissing the dialog in the Activity.onPause() method (as below), but since the dialog in declared in AsyncTask class, MainActivity does have access to it.

I moved the instantiation of the dialog to MainActivity . So onPause() does get the called and the call to dismiss() happens, but this is long after the message "Unfortunately MyApp has stopped" appears on the device.

How do I do this?

public class MainActivity extends AppCompatActivity  implements ActionBar.TabListener {

    private ProgressDialog nDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

         nDialog = new ProgressDialog(mainActivity);
        nDialog.setMessage(resources.getString(R.string.loading));
         nDialog.setTitle(resources.getString(R.string.loading));
         nDialog.setIndeterminate(false);
         nDialog.setCancelable(false);

         String url = "http://----------------------------------------";
        Fragment myFragment = mTabsPageAdapter.getItem(TabsPagerAdapter.MY_TAB);
        new LoadAndStoreDataTask((OnLoadAndStoreCompleteListener)permitsFragment, nDialog).execute(url);
    }

    @Override
    public void onPause(){
        super.onPause();
        if(nDialog != null)
            nDialog.dismiss();
    }
}

private class LoadAndStoreDataTask extends AsyncTask   <String,  Integer, String> {

    private ProgressDialog nDialog;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        Resources resources = getResources();

         nDialog.show();
    }

    protected String doInBackground(String... urls) {
        ....
    }

    @Override
    protected void onPostExecute(String result) {
       if (nDialog != null) {
            nDialog.dismiss();
        }
    }

    @Override
    protected void onCancelled() {
    if (nDialog != null) {
        nDialog.dismiss();
    }

 }

Answer 1

change

private class LoadAndStoreDataTask extends AsyncTask   <String,  Integer, String> {

    private ProgressDialog nDialog;

to

private class LoadAndStoreDataTask extends AsyncTask   <String,  Integer, String> {

so the task will used the MainActivity nDialog field instead of the one in the LoadAndStoreDataTask class