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POFragment onCreateView and onActivityCreated called twice
 

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    <p>I'm developing an app using Android 4.0 ICS and fragments.</p> <p>Consider this modified example from the ICS 4.0.3 (API level 15) API's demo example app:</p> <pre><code>public class FragmentTabs extends Activity { private static final String TAG = FragmentTabs.class.getSimpleName(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); final ActionBar bar = getActionBar(); bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE); bar.addTab(bar.newTab() .setText("Simple") .setTabListener(new TabListener&lt;SimpleFragment&gt;( this, "mysimple", SimpleFragment.class))); if (savedInstanceState != null) { bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0)); Log.d(TAG, "FragmentTabs.onCreate tab: " + savedInstanceState.getInt("tab")); Log.d(TAG, "FragmentTabs.onCreate number: " + savedInstanceState.getInt("number")); } } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt("tab", getActionBar().getSelectedNavigationIndex()); } public static class TabListener&lt;T extends Fragment&gt; implements ActionBar.TabListener { private final Activity mActivity; private final String mTag; private final Class&lt;T&gt; mClass; private final Bundle mArgs; private Fragment mFragment; public TabListener(Activity activity, String tag, Class&lt;T&gt; clz) { this(activity, tag, clz, null); } public TabListener(Activity activity, String tag, Class&lt;T&gt; clz, Bundle args) { mActivity = activity; mTag = tag; mClass = clz; mArgs = args; // Check to see if we already have a fragment for this tab, probably // from a previously saved state. If so, deactivate it, because our // initial state is that a tab isn't shown. mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag); if (mFragment != null &amp;&amp; !mFragment.isDetached()) { Log.d(TAG, "constructor: detaching fragment " + mTag); FragmentTransaction ft = mActivity.getFragmentManager().beginTransaction(); ft.detach(mFragment); ft.commit(); } } public void onTabSelected(Tab tab, FragmentTransaction ft) { if (mFragment == null) { mFragment = Fragment.instantiate(mActivity, mClass.getName(), mArgs); Log.d(TAG, "onTabSelected adding fragment " + mTag); ft.add(android.R.id.content, mFragment, mTag); } else { Log.d(TAG, "onTabSelected attaching fragment " + mTag); ft.attach(mFragment); } } public void onTabUnselected(Tab tab, FragmentTransaction ft) { if (mFragment != null) { Log.d(TAG, "onTabUnselected detaching fragment " + mTag); ft.detach(mFragment); } } public void onTabReselected(Tab tab, FragmentTransaction ft) { Toast.makeText(mActivity, "Reselected!", Toast.LENGTH_SHORT).show(); } } public static class SimpleFragment extends Fragment { TextView textView; int mNum; /** * When creating, retrieve this instance's number from its arguments. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.d(FragmentTabs.TAG, "onCreate " + (savedInstanceState != null ? ("state " + savedInstanceState.getInt("number")) : "no state")); if(savedInstanceState != null) { mNum = savedInstanceState.getInt("number"); } else { mNum = 25; } } @Override public void onActivityCreated(Bundle savedInstanceState) { Log.d(TAG, "onActivityCreated"); if(savedInstanceState != null) { Log.d(TAG, "saved variable number: " + savedInstanceState.getInt("number")); } super.onActivityCreated(savedInstanceState); } @Override public void onSaveInstanceState(Bundle outState) { Log.d(TAG, "onSaveInstanceState saving: " + mNum); outState.putInt("number", mNum); super.onSaveInstanceState(outState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { Log.d(FragmentTabs.TAG, "onCreateView " + (savedInstanceState != null ? ("state: " + savedInstanceState.getInt("number")) : "no state")); textView = new TextView(getActivity()); textView.setText("Hello world: " + mNum); textView.setBackgroundDrawable(getResources().getDrawable(android.R.drawable.gallery_thumb)); return textView; } } </code></pre> <p>}</p> <p>Here is the output retrieved from running this example and then rotating the phone:</p> <pre><code>06-11 11:31:42.559: D/FragmentTabs(10726): onTabSelected adding fragment mysimple 06-11 11:31:42.559: D/FragmentTabs(10726): onCreate no state 06-11 11:31:42.559: D/FragmentTabs(10726): onCreateView no state 06-11 11:31:42.567: D/FragmentTabs(10726): onActivityCreated 06-11 11:31:45.286: D/FragmentTabs(10726): onSaveInstanceState saving: 25 06-11 11:31:45.325: D/FragmentTabs(10726): onCreate state 25 06-11 11:31:45.340: D/FragmentTabs(10726): constructor: detaching fragment mysimple 06-11 11:31:45.340: D/FragmentTabs(10726): onTabSelected attaching fragment mysimple 06-11 11:31:45.348: D/FragmentTabs(10726): FragmentTabs.onCreate tab: 0 06-11 11:31:45.348: D/FragmentTabs(10726): FragmentTabs.onCreate number: 0 06-11 11:31:45.348: D/FragmentTabs(10726): onCreateView state: 25 06-11 11:31:45.348: D/FragmentTabs(10726): onActivityCreated 06-11 11:31:45.348: D/FragmentTabs(10726): saved variable number: 25 06-11 11:31:45.348: D/FragmentTabs(10726): onCreateView no state 06-11 11:31:45.348: D/FragmentTabs(10726): onActivityCreated </code></pre> <p>My question is, why is the onCreateView and onActivityCreated called twice? The first time with a Bundle with the saved state and the second time with a null savedInstanceState? </p> <p>This is causing problems with retaining the state of the fragment on rotation.</p>
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