Delete old activity instance when starting a new activity

Question

I'm looking to delete/remove an old activity instance when a new instance (of same activity) is created, however I need to maintain all other activities in back-stack (therefore FLAG_ACTIVITY_CLEAR_TOP won't suffice).

E.g. say I have activities A, B & C. I start: A -> B -> C -> B. On the start of the second B activity I need to remove the existing B activity. Therefore I now have: A -> C -> B running...

Any help appreciated.

Answer 1

You could use the Intent flags to remove the earlier task. Hopefully this helps.

Intent intent = new Intent(this, Activity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);

This flag will cause any existing task that would be associated with the activity to be cleared before the activity is started. That is, the activity becomes the new root of an otherwise empty task, and any old activities are finished.

Answer 2

I am able to do that by overriding onNewIntent

    @Override
protected void onNewIntent(Intent intent) {


        Bundle extras = intent.getExtras();
        Intent msgIntent = new Intent(this, MyActivity.class);
        msgIntent.putExtras(extras);
        startActivity(msgIntent);
        finish();
        return;

    super.onNewIntent(intent);
}

make activity single task

 <activity
        android:name=".MyActivity"
        android:launchMode="singleTask" >
    </activity>