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PONullPointerException with fragments
 

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  1. PONullPointerException with fragments
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    <p>My application contains ViewPager in MainActivity with two fragments. First fragment contains ListView. I never see this, but I see reports from users about RuntimeException in Google Play:</p> <pre><code>java.lang.RuntimeException: Unable to resume activity {com.my.project/com.my.project.MainActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { (has extras) }} to activity {com.my.project/com.my.project.MainActivity}: java.lang.NullPointerException at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2120) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2135) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1668) at android.app.ActivityThread.access$1500(ActivityThread.java:117) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:130) at android.app.ActivityThread.main(ActivityThread.java:3683) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:875) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:633) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { (has extras) }} to activity {com.my.project/com.my.project.MainActivity}: java.lang.NullPointerException at android.app.ActivityThread.deliverResults(ActivityThread.java:2532) at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2107) ... 12 more Caused by: java.lang.NullPointerException at com.my.project.FirstFragment.load(FirstFragment.java:551) at com.my.project.MainActivity.onActivityResult(MainActivity.java:132) at android.app.Activity.dispatchActivityResult(Activity.java:3908) at android.app.ActivityThread.deliverResults(ActivityThread.java:2528) ... 13 more </code></pre> <p>Here is code from FirstFragment.java:</p> <pre><code>public class FirstFragment extends Fragment { ArrayList&lt;ListItemObject&gt; listItems = null; ArrayAdapter&lt;ListItemObject&gt; mAdapter; void load() { mAdapter.clear(); // I get error here, that is FirstFragment.java:551 ... } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { super.onCreateView(inflater, container, savedInstanceState); listItems = new ArrayList&lt;ListItemObject&gt;(); mAdapter = new MyAdapter(getActivity(), listItems); listView.setAdapter(mAdapter); } } </code></pre> <p>That is all occuerences of mAdapter. And I can't understand, how it can cause NullPointerException. I think that sometimes Fragment1 destroying and recreating, but without onCreateView(). <strong>I talk with one of users which have this problem and he say me, that this bug run away after he uncheck "Don't keep activities" in "Developer options" in settings.</strong> I don't know, can I fix it? Or I need to say all my users "uncheck this option"?</p> <p>In my NainActivity:</p> <pre><code>public class MainActivity extends FragmentActivity { Vector&lt;Fragment&gt; fragments; ViewPager viewPager; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); viewPager = (ViewPager) findViewById(R.id.pager); fragments = new Vector&lt;Fragment&gt;(); fragments.add(Fragment.instantiate(this, Fragment1.class.getName())); fragments.add(Fragment.instantiate(this, Fragment2.class.getName())); viewPager.setOffscreenPageLimit(fragments.size()); PagerAdapter pagerAdapter = new PagerAdapter(super.getSupportFragmentManager(), fragments); viewPager.setAdapter(pagerAdapter); viewPager.setCurrentItem(0); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if(requestCode==1) { ((MainChat)fragments.get(0)).load(); } } class PagerAdapter extends FragmentPagerAdapter implements IconPagerAdapter { private List&lt;Fragment&gt; fragments; public PagerAdapter(FragmentManager fm, List&lt;Fragment&gt; fragments) { super(fm); this.fragments = fragments; } @Override public Fragment getItem(int position) { return this.fragments.get(position); } @Override public int getCount() { return this.fragments.size(); } } } </code></pre>
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    1. COAre you sure that's your `MainActivity`? The error clearly states there is something going on at `MainActivity::onActivityResult`, which you apparently do not have...
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    2. COWhen load() is called? Probably mAdapter is not persisting through config changes.
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      1. USJoão Melo
    3. COYou certainly do not need to have user change their device options, you have to **fix** this issue... Which is probably the result of a known issue in the _Support Package_, but without further information we can only guess.
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