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POViewPager fragments disappear when change screen rotation
 

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  1. POViewPager fragments disappear when change screen rotation
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    <p>I'm working on android application that contains <code>ViewPager</code> with <code>Fragment</code>s, like this:</p> <p><code>MainActivity</code>(<code>MainActivityFragment</code>(<code>screenSlideViewPager</code>(<code>Fragment</code>s))), which means:</p> <p><code>Activity</code> <strong>contains</strong> <code>Fragment</code> <strong>contains</strong> <code>ViewPager</code> <strong>contains</strong> <code>Fragment</code>s</p> <p>Now my problem is when rotate device or change screen rotation all Fragments in ViewPager are disappear.</p> <p>any ideas to solve this issue?</p> <p><strong>EDIT 1</strong></p> <p>MainActivity.java:</p> <pre><code>@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getSupportFragmentManager().findFragmentByTag(TAG) == null) { final FragmentTransaction ft = getSupportFragmentManager() .beginTransaction(); ft.add(android.R.id.content, new MainActivityFragment(), TAG); ft.commit(); } } </code></pre> <p>MainActivityFragment.java:</p> <pre><code>public class MainActivityFragment extends Fragment { private ViewPager mPager = null; private PagerAdapter mPageAdapter = null; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View reVal = inflater.inflate(R.layout.activity_main, container, false); mPager = (ViewPager) reVal.findViewById(R.id.pagerMainContent); mPageAdapter = new ScreenSlidePagerAdapter(getActivity().getFragmentManager()); mPager.setAdapter(mPageAdapter); return reVal; } private MainGridViewFragment mainGridFragment; private AlphabetGridViewFragment alphabetGridFragment; private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter { public ScreenSlidePagerAdapter(FragmentManager fm) { super(fm); } @Override public android.app.Fragment getItem(int position) { switch (position) { case 1: mainGridFragment = new MainGridViewFragment(); return mainGridFragment; case 0: alphabetGridFragment = new AlphabetGridViewFragment(); return alphabetGridFragment; default: return null; } } @Override public int getCount() { return 2; } } } </code></pre> <p><strong>EDIT 2</strong> <img src="https://i.stack.imgur.com/MCWOg.png" alt="The Activity After Screen Rotation"></p> <p>Obviously <code>MainActivity</code> and <code>MainActivityFragment</code> are loaded, and the proof is The <code>ActionBar</code>, notice also that <code>ViewPager</code> is loaded too, because you still can navigate between pages (the blue light means that the pager reached to last page) but you can't see its content.</p>
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    1. COGood question, but we need more code to help you!
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    2. COWhen there is a screen rotation in Android, your activity is destroyed and recreated. Therefore, you need to save the state of your variables and such so that you can "continue where you left off". This may help http://developer.android.com/training/basics/activity-lifecycle/recreating.html
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    3. COI know, i have already saved activity state, but this is not destroy issue, Everything is disappearing even the views, i mean i am facing white screen when device rotation changed (without exceptions)
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