Change orientation change my fragment in DrawerLayout

Question

I have three fragments in my DrawerLayolut:

Fragment A
Fragment B
Fragment C

By default (in the init of the app) I load the FragmentA : and, if I go to the, for instance, FragmentB works well.

Problem: when I rotate my screen in the FragmentB, I come back to the FragmentA.

I don't know how to avoid this. I tried with the next code in the onCreate of the AppCompatActivity:

Fragment mFragment = null;

if(getSupportFragmentManager().findFragmentById(R.id.myframe) == null) {

   mFragment = new CalendarioFragment();
   getSupportFragmentManager().beginTransaction().add(R.id.myframe, mFragment ).commit();

} else {

   if(mFragment instanceof FragmentA){
       mFragment = (FragmentA) getSupportFragmentManager().findFragmentById(R.id.myframe);

   }else if(mFragment instanceof FragmentB){
       mFragment = (FragmentB) getSupportFragmentManager().findFragmentById(R.id.myframe);

   }else if(mFragment instanceof FragmentC){
       mFragment = (FragmentC) getSupportFragmentManager().findFragmentById(R.id.myframe);

   }
}

But doesn't work as I expected... Could, please, somebody help me with my problem? Please, any help is welcome

I read about this other solution:

<activity android:name="CalActivity" android:configChanges="orientation|keyboardHidden"/>

But I think this isn't recomendable... (and doesn't work for me)

score 1 · Accepted Answer · edited May 23 '17 at 12:29

Along with <activity android:name="CalActivity" android:configChanges="orientation|keyboardHidden"/> you need to call onConfigurationChanged() in your Activity. It should look something like this:

@Override
public void onConfigurationChanged(Configuration config) {
    super.onConfigurationChanged(config);
    // Your code here to replace fragments correctly
}

This is the Android API guide on the subject: Handling Runtime Changes

Though, as you said this is not recommended, a better solution would be using onSavedInstanceState and onRestoreInstanceState, like so:

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);
    savedInstanceState.putInt("currentFragment", 2);
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    int fragmentNum = savedInstanceState.getInt("currentFragment");
    // Restore fragment based on fragmentNum
}

See this question for more: Saving Activity State on Android

I don't understand "Your code here to replace fragments" Why I need to replace my Fragments? +1 :) — MartaGom, Oct 02 '15 at 17:01
@MartaGom Because the fragments should be reset to their original state. You will need to use your code to remember which fragment is currently active, and switch back to it in `onConfigurationChanged()` or `onRestoreInstanceState()`. — Bryan, Oct 02 '15 at 17:04
Now I cant test your answer. I try it tomorrow and if it works I will mark it as a correct answer :) dont worries — MartaGom, Oct 02 '15 at 17:07

Change orientation change my fragment in DrawerLayout

1 Answers1