CODEWITHSUNDEEP
androidandroid-activity
UMAR-MOBITSOLUTIONS
UMAR-MOBITSOLUTIONS

Reputation: 77984

How to clear previous activity stack and Exit Application on back button?

I have three activities:

A,B,C

A is home screen.

Activities are launched as follow A->B->C

If I come to home screen using backbutton, I want to clear activity stack/previous activities history and it should exit the application.

Can anyone guide me how to achieve this?

Upvotes: 10

Views: 12215

Answers (4)

Arseniy
Arseniy

Reputation: 1778

You can do following:
1. Set clearTaskOnLaunch = "true" in AndroidManifest, in declaration of activity A
2. In activity C:

@Override
public void onBackPressed(){
    moveTaskToBack(true);
}

So if user presses back - it comes back to homescreen.
If user launches application again - task stack clears and he comes to root activity (A)

Upvotes: 4

Axel M. Garcia
Axel M. Garcia

Reputation: 5146

I think compostus is true, but if not, from A you can launch B with startActivityForResult() and in onActivityResult() handle the received "message". Activity B will send a "CLOSE_ACTIVITY" message if back button has been pressed.

Upvotes: 0

Femi
Femi

Reputation: 64700

In Activity A try this:

@Override
    public boolean onKeyDown(int keyCode, KeyEvent event)
    {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0){
                finish();
        }

        return super.onKeyDown(keyCode, event);
    }

This should ensure that if you hit the back button the activity is finish()ed. If this activity is at the bottom of the stack finish should exit the activity.

Upvotes: 0

compostus
compostus

Reputation: 1228

Very simple: use intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); on an intent used to start the activity A.

Upvotes: 15

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