将活动移到AsyncTask的最前面

Question

In an activity, I have created a AsyncTask after hiding the activity:

this.moveTaskToBack(true);
(new MyTask(this)).execute();

To show a dialog in the task (in onPostExcecute ), I want to bring the activity to front:

alertDialog.show();

Intent intent = new Intent(mainActivity, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mainActivity.getBaseContext().startActivity(intent);

But a new instance of the main activity is created and shown on top of the dialog, although the application was still running (the activity has also a dialog style Theme.Dialog). How should I fix this?

Edit: According to javadoc , this code always recreates the activity and doesn't bring its previous instance to front, since startActivity is called from outside of an Activity Context.

Answer 1

How about adding a new piece of information to that intent, and catching it in onCreate() ?

What I mean is something like this:

public class MainActivity extends Activity {

    public static final String WANT_DIALOG_EXTRA = "WANT_DIALOG_EXTRA";

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

        if (getIntent().hasExtra(WANT_DIALOG_EXTRA)) {
            // create and show dialog
        }
    }

}

Then when you create your intent, add one more line like this:

intent.putExtra(MainActivity.WANT_DIALOG_EXTRA, true);