Removing an activity from the stack

Question

When going from activity A to B, I want to clear A off the stack: so when the user is pressing the back button in activity B, the app exits.

Intent intent = new Intent(A.this, B.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);

These code lines do not work - the app goes back to activity A. I've also tried to OR with the flag Intent.FLAG_ACTIVITY_NEW_TASK, same result. I've actually also tried FLAG_ACTIVITY_NO_HISTORY.

I'm using Android 2.2 for my app.

it works!!! if app exits and if you have two activity. – Samir Mangroliya Jun 07 '12 at 14:34 — Samir Mangroliya, Jun 07 '12 at 14:34

score 1 · Accepted Answer · answered Jun 07 '12 at 15:06

1

Just call finish() after you call startActivity(). It should clear Activity A from the stack. In code it looks like this:

Intent intent = new Intent(A.this, B.class);
startActivity(intent);
finish();

answered Jun 07 '12 at 15:06

onit

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score 0 · Answer 2 · answered Jun 07 '12 at 14:36

0

Two solutions: in your B activity:

@Override
public void onBackPressed() {
    super.onBackPressed(); //not sure if this line is needed
    System.exit(0);
}

Or a much nicer: Start your activity with startActivityForResult, and implement your A activity's onActivityResult method:

public void onActivityResult(int requestCode, int resultCode, Intent intent) {
   finish();
}

answered Jun 07 '12 at 14:36

Antal Horváth

151
4

`System.exit(0)` is highly disregarded in Android development. – Kazekage Gaara Jun 07 '12 at 14:40
Could you provide an explanation please? – Antal Horváth Jun 07 '12 at 14:41
1

`finish()` is always the way to go, never `System.exit()`. Read [this](http://stackoverflow.com/questions/2042222/close-application) for a good discussion on the matter. – Kazekage Gaara Jun 07 '12 at 14:43

score 0 · Answer 3 · edited Jul 26 '22 at 03:00

0

FLAG_ACTIVITY_NO_HISTORY

If set, the new activity is not kept in the history stack. As soon as the user navigates away from it, the activity is finished. This may also be set with the noHistory attribute.

So, You can implement this from your

AndroidManifest.xml file,

android:noHistory="true"

edited Jul 26 '22 at 03:00

Ryan M

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answered Jun 07 '12 at 16:12

Mehul

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Removing an activity from the stack

3 Answers3