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POFragment's onCreateView() causes my app to crash
 

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    <p>I'm having a strange problem. I'm using Fragments in an app that has a host FragmentActivity in which I implemented an internal <code>class FragmentPagerAdapater</code> that constructs the Fragments and puts them into my activity's tabs.</p> <p>In the app, I need to pass on an Object from my Activity to the Fragments. I'm not really sure what the proper way to do this is, so I improvised, and went for a static Fragment <code>newInstance(Object obj)</code> in my Fragments. This method just calls the default Fragment's constructor and sets a instance variable to hold the Object within the Fragment. </p> <p>Now in the Fragment's <code>createView()</code> method, I use the instance's Object informations to fill the layout. This works fine when the app launches, but the app crashes when I change the screen orientation from portrait to landscape (or the opposite). The logs indicates a NullPointerException on the instance Object in <code>createView()</code>. I feel like I missed something in the lifecycle but I can't find the answer. Is there somethign special to do so my Fragments will save their instance variable no matter what ?</p> <p>Here's a code sample to help you understand what the issue is:</p> <pre><code>public class MyFragment extends Fragment { private Object obj; public static MyFragment newInstance(Object obj) { MyFragment fragment = new MyFragment(); fragment.setObject(obj); return fragment; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.layout_fragment, container, false); MyType res = ((Type) (obj)).getSomething(); // This line causes the crash because obj is null when I switch to another orientation // I Do something with res to fill rootView return rootView; } private void setObject(Object obj) { this.obj = obj; } } // In the Activity I simply create the Fragment using MyFragment fragment = MyFragment.newInstance(myObjectToPass); </code></pre> <p>Thanks for your help !</p>
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    1. COwe need to see teh code!
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      1. USMarko Niciforovic
    2. COcrash => post stack trace.
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