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POMapActivity in TabHost Fragment disappearing after tab switch
 

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    <p>I'm trying to display a map in a set of tabs, using fragments. The problem I'm having is the map activity disappears if the user navigates to another fragment, then back. How can I display a MapActivity in fragments in a tabhost?</p> <p>The basis for this is from the numerous questions around how to integrate a MapActivity with fragments (see <a href="https://stackoverflow.com/questions/5109336/mapview-in-a-fragment-honeycomb">MapView in a Fragment (Honeycomb)</a>)</p> <p>MainTabActivity has a tabhost and uses FragmentManager to display Fragments in the tabs. MapFragment has a tabhost and uses it to display a MapActivity.<br> MapFragment does use LocalActivityManager to propogate lifecycle events to the the contained activity.</p> <p>So MapFragment:</p> <pre><code> public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.map_fragment, container, false); mTabHost = (TabHost) view.findViewById(android.R.id.tabhost); mTabHost.setup(getLocalActivityManager()); Intent intent = new Intent(getActivity(), MapActivityWrapper.class); // intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);//does nothing TabHost.TabSpec tab = mTabHost.newTabSpec("map") .setIndicator("map") .setContent(intent); mTabHost.addTab(tab); return view; } </code></pre> <p>MapFragment layout:</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"&gt; &lt;TabHost xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;TabWidget android:id="@android:id/tabs" android:visibility="gone" android:layout_width="fill_parent" android:layout_height="wrap_content"/&gt; &lt;FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent"/&gt; &lt;/LinearLayout&gt; &lt;/TabHost&gt; &lt;/LinearLayout&gt; </code></pre> <p>The code in MainTabActivity for changing the tab contents:</p> <pre><code>private void updateTab(String oldId, String tabId) { FragmentManager fm = getSupportFragmentManager(); Fragment old = fm.findFragmentByTag(oldId); Fragment selected = fm.findFragmentByTag(tabId); FragmentTransaction ft = fm.beginTransaction(); boolean added = false; if (selected == null) { selected = createFragment(tabId); } else { try { ft.remove(selected); } catch (Exception e) { ft.add(android.R.id.tabcontent, selected, tabId); added = true; //exception for removing an unadded fragment... why throw an exception? } } if (old != null) ft.remove(old); if (!added) ft.replace(android.R.id.tabcontent, selected, tabId); if (!creating &amp;&amp; !backStackProcessing) ft.addToBackStack(null);//member vars ft.commit(); } </code></pre> <p>MainTabActivity layout (deleted a bunch of unrelated layout):</p> <pre><code>&lt;TabHost xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#EFEFEF"&gt; &lt;RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;FrameLayout android:id="@android:id/tabcontent" android:layout_gravity="top" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="@color/app_default_bg" android:layout_above="@+id/ad_region" android:layout_below="@+id/quick_action_region"&gt; &lt;FrameLayout android:id="@+id/tab1" android:layout_width="fill_parent" android:layout_height="fill_parent"/&gt; &lt;FrameLayout android:id="@+id/tab2" android:layout_width="fill_parent" android:layout_height="fill_parent"/&gt; &lt;FrameLayout android:id="@+id/map_tab" android:layout_width="fill_parent" android:layout_height="fill_parent"/&gt; &lt;FrameLayout android:id="@+id/tab3" android:layout_width="fill_parent" android:layout_height="fill_parent"/&gt; &lt;/FrameLayout&gt; &lt;TabWidget android:layout_width="fill_parent" android:id="@android:id/tabs" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true"/&gt; &lt;/RelativeLayout&gt; &lt;/TabHost&gt; </code></pre> <p>Again - The problem I'm having is the map activity disappears if the user navigates to another fragment, then back. How can I display a MapActivity in fragments in a tabhost?</p> <p>Thanks much.</p>
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