My app consists of 1 fragment. This fragment contains a recyclerview with a large number of entries. 

The symptom was that after device rotation it seemed not possible to scroll the recyclerview to the saved position. Whatever I did, no scrolling was the result. So, strange things happened in the UI. 

**EDIT** (revealing the root cause) ... 

In my activity I had this code ... 

```
if (findViewById(R.id.fragment_container) != null) {
    FragmentCategoryChecklist f2 = new FragmentCategoryChecklist();
    Bundle b = new Bundle();
    b.putString("contents", "Category Fragment");
    f2.setArguments(b);        
    getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, f2).commit();
 }

```

This is wrong! See the below code.

When the device is rotated with this code, this creates each time a **new** fragment. This is wrong because Android ALREADY recreates the (saved) fragment. 

The result of this is that a fragment is created with instance data by the code, then immediately destroyed and then recreated without any instance-data. No saved instance data means no scrolling to a previously saved position. 

The correct code is shown below. Sorry, my question was only a symptom and not showing the root cause. 

```
Fragment f = getSupportFragmentManager().findFragmentById( R.id.fragment_container);
if( f == null) {
    if (findViewById(R.id.fragment_container) != null) {
        FragmentCategoryChecklist f2 = new FragmentCategoryChecklist();
        Bundle b = new Bundle();
        b.putString("contents", "Category Fragment");
        f2.setArguments(b); 
        getSupportFragmentManager().
            beginTransaction().
            replace(R.id.fragment_container, f2).
            commit();
    }
}

```