Clear Activity back stack [duplicate]

问题:

This question already has an answer here:

• Android: Clear the back stack 31 answers

I start from activity A->B->C->D->E ..when i go from D->E there should be no activity in stack but, the user can use back button from D and go to C (without refreshing Activity C, like normal back function)

回答1:

You could add a BroadcastReceiver in all activities you want to close (A, B, C, D):

public class MyActivity extends Activity {
    private FinishReceiver finishReceiver;
    private static final String ACTION_FINISH = 
           "com.mypackage.MyActivity.ACTION_FINISH";

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

        finishReceiver= new FinishReceiver();
        registerReceiver(finishReceiver, new IntentFilter(ACTION_FINISH));
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        unregisterReceiver(finishReceiver);
    }

    private final class FinishReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(ACTION_FINISH)) 
                finish();
        }
    }
}

... and close them by calling ...

sendBroadcast(new Intent(ACTION_FINISH));

... in activity E. Check this nice example too.

回答2:

Add flag FLAG_ACTIVITY_CLEAR_TOP to your intent to clear your other Activities form Back stack when you are starting your E Activity like :

intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

then start your Activity :

startActivity(intent)

More Information on : Task and BackStack

回答3:

Add flags to your itent it will clear all activities in a stack

Intent intent = new Intent(getApplicationContext(),MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |  Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

this is the right wat to clear back activities already in a stack

Hope this helps..