what does onBackPress call in a Fragment

Question

In a Fragment i have this:

onPause(){

super.onPause();
if(flag){
getActivity.finish();
}else{
}
}

onResume(){

flag = true;
super.onResume();
}

and there is a Button, on click i set this flag to false:

Button.onClick{
flag = false;
}

The idea is:

when the button is clicked don't finish this Activity. But when device BackButton is pressed finish().

But this logic isn't working. The reason is, when i press BackButton of the device, onPause is not being called.

This is the 4th Fragment in the Activty. So when i press BackButton i can see the 3rd Fragment. Which i don't want to.

I am using this on a API 10 device, But my application uses support library v4.

Thank You.

Nermeen · Accepted Answer · 2013-11-14T08:48:59.523

5

If you want to close the activity on the back press, then Override the onBackPressed inside the activity as following:

public void onBackPressed() {
   Fragment fragment = getSupportFragmentManager().findFragmentByTag("yourfragment");
   if (fragment instanceOf YourFragmet) {
          finish();
          return;
   }
   super.onBackPressed();
}

If you want to close the activity on the button click, then you can call

Button.onClick{
  getActivity().onBackPressed();
}

OR

Button.onClick{
  getActivity().finish();
}

If When you are transitioning between Fragments, you call addToBackStack() as part of your FragmentTransaction, then the back button will take you to the fragment on the top of the back stack

edited Nov 14 '13 at 08:48

answered Dec 07 '12 at 07:23

Nermeen

15,883
5
59
72

No. I **don't** want to close the Activity **onButtonClicked**. I want to close the Activity only when **BackIsPressed** – Archie.bpgc Dec 07 '12 at 07:28
Should i use this in **onViewCreated()**?? with **fragment.getView** replaced with the **view** parameter of **onViewCreated** – Archie.bpgc Dec 07 '12 at 07:53
No its not reaching this code when backPressed.Is there any specific block i must use this in. Like **onCreateView** or something else; – Archie.bpgc Dec 07 '12 at 08:01
There is nothing like **onBackPressed** to override. May be because i am using targerAPI = 15; But when device back is pressed, Fragment's onPause() must be triggered right? – Archie.bpgc Dec 07 '12 at 08:12
onBackPressed in the activity not the fragment – Nermeen Dec 07 '12 at 08:14

score -1 · Answer 2 · answered Feb 03 '13 at 01:10

-1

Why can't you use onDetach() of Fragment? On Back key pressed, there will be onDetach() called on the fragment to remove that.

@Override
public void onDetach() {
   super.onDetach();
   if(flag){
     getActivity.finish();
   }else{
        }
}

answered Feb 03 '13 at 01:10

Thiru

341
1
4
7

When is `onDetach()` called? on backstack popup?? – Archie.bpgc Feb 03 '13 at 18:38
yes, when you press backkey the foreground fragment will get detached and the previously attached fragment will get displayed. – Thiru Feb 05 '13 at 04:31

what does onBackPress call in a Fragment

2 Answers2

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