CODEWITHSUNDEEP
androidandroid-intentbackonbackpressed
Zander B
Zander B

Reputation: 247

Android back stack with multiple Activities

I have a few activities and can't figure out a way to make it work with the backstack.

Is there a way to do this:

MainActivity ->(intent) subActivity ->(intent)subsubActivity->(back press)subActivity->*(back press)MainActivity

*This is where I am having problems. Since I am coming from my subsubActivity, even thought I used android:noHistory="true" in the manifest, it doesn't go back to main activity.

Thanks for any help!

Upvotes: 1

Views: 1294

Answers (2)

Cruceo
Cruceo

Reputation: 6834

This is a perfect candidate for using a combination of startActivityForResult and overriding onActivityResult in the calling Activity.

Assuming you have Activity A, which starts Activity B (which we cannot move back to), which starts Activity C:

Activity A will call Activity B the way you are now. Activity B, however, will call startActivityForResult(Intent, int) instead of just startActivity(Intent). This way, when we return from Activity C, we can call finish() on Activity B and return to Activity A, like so:

public class ActivityB extends Activity {

    private static final int REQUEST_CODE_ACTIVITY_C = 1001; 

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data){
        if(requestCode == REQUEST_CODE_ACTIVITY_C) finish(); // If coming back from Activity C, finish()
    }

    private void openActivityC(){
        Intent intent = new Intent(this, ActivityC.class);
        startActivityForResult(intent, REQUEST_CODE_ACTIVITY_C);
    }

}

Now when you call openActivityC(), you're ensuring that onActivityResult() will be called when returning from Activity C, thus allowing you to end the Activity and return back to Activity A.

You can provide even more specific actions (such as setting/checking the result code (e.g. if it canceled (Activity.RESULT_CANCELED) or successful (Activity.RESULT_OK)) for statuses, to better determine what that calling Activity should do.

Hopefully that helps explain it a bit.

Edit: Also an afterthought, if there's no chance you'll ever want to go back to Activity B, then @Kay 's solution of just calling finish() after firing the Intent for Activity C would be the simplest approach.

Upvotes: 1

Karol Żygłowicz
Karol Żygłowicz

Reputation: 2452

If i get what you want You can use startActivities with an array of intents which will be fired one after another activity1->activity2->activity3 -back-activity2 -back-acitivty1

Upvotes: 0

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