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I have two activities A and B.

I have a mapview inside a fragment in activity A and on button click ,activity B is launched. The lifecyle goes like this:

onPause() in fragment inside A
onPause() in activity A

onStop() in fragment inside A
onStop() in activity A

When I press the physical back button on the device from activity B, it returns to activity A and the flow goes like this.

onStart() in activity A
onStart() in fragment inside A

onResume() in activity A
onResume() in fragment inside A

Now I have a custom toolbar set as actionbar using setSupportActionBar(mToolbar) in ActivityB. I have also set getSupportActionBar().setDisplayHomeAsUpEnabled(true); for back navigation and it displays a left arrow. The problem is that on click of left arrow,the activity A is getting recreated again. The lifecycle goes like this:

onDestory() in fragment(in Activity A)
onCreate() in activity A
onCreate() in fragment
onCreateView() in fragment
onStart() in activity A
onStart() in fragment
onResume() in activity A
onResume() in fragment

And because of this, the map in activity A fragment is getting reloaded again.

Any can we prevent the fragment getting destryoed on back navigation?

Thanks in advance

Renjith
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1 Answers1

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Have you tried starting activity A using the singleTop launchMode? I ran into the same problem and specifying this launchMode for the calling activity solved my problem.

<activity
    android:name="A"
    android:label="..."
    android:launchMode="singleTop" />
Wolfgang
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