Cannot save fragment state during rotation

Question

I have several fragments in activity, changed by bottombar. I tried to implement fragment state handling by using Once for all, how to correctly save instance state of Fragments in back stack? The problem is that

    mContent = getSupportFragmentManager().getFragment(savedInstanceState, TAG);

Returns the next error:

java.lang.NullPointerException: Attempt to invoke virtual method 'int java.util.ArrayList.size()' on a null object reference

While debugging I have the next savedInstanceSet:

ArrayMap@5665, size = 4
 value[0]=Bundle
 value[1]="FragmentName"
 value[2]=FragmentManagerState
 value[3]={Integer}"0"

Please dont paste solutions like

 setRetainInstance(true),
 android:configChanges="orientation|screenSize"

and so on, because I need to recreate fragment (different xml files for land and portrait).

score 1 · Answer 1 · answered Aug 08 '17 at 11:10

1

Use below code;

Add this line to menifest

android:configChanges="orientation|screenSize"

and add this function to your activity file,

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

answered Aug 08 '17 at 11:10

Vishal Vaishnav

3,346
3
26
57

I cannot use this one, because I need to recreate 2 fragments from land/layout file. So is there any other solutions? – Rakymzhan Zhomartov Aug 08 '17 at 12:13
Never ever manually call `Lifecycle` methods. They are supposed to be called only by the OS. That being said, please consider removing the answer. – Iulian Popescu Aug 09 '17 at 12:17

score 0 · Answer 2 · answered Aug 08 '17 at 11:15

0

Include this in your manifest if you dont want to override config change

<activity android:name=".MainActivity" android:configChanges="orientation|screenSize|screenLayout" >

This basically allows OS to handle orientation change for you if you dont want override onConfigChange this code should work fine

answered Aug 08 '17 at 11:15

akshay_shahane

4,423
2
17
30

I cannot use this one, because I need to recreate 2 fragments from land/layout file. So is there any other solutions? – Rakymzhan Zhomartov Aug 08 '17 at 12:13
@Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); } try using this in fragment's onCreate – akshay_shahane Aug 08 '17 at 13:04
This method didnt help – Rakymzhan Zhomartov Aug 09 '17 at 04:48

Cannot save fragment state during rotation

2 Answers2