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POOrientation change from dual-pane to single-pane
 

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  1. POOrientation change from dual-pane to single-pane
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    <p>orientation change between different layouts for landscape and portrait seems to be easy, however I cannot find a solution for my current situation.</p> <p>I want to use a dual-pane layout with two fragments in landscape mode</p> <p>res\layout-land\dashboard_activity.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" &gt; &lt;fragment class="xxx.DashboardFragment" android:id="@+id/master_frag" android:layout_width="@dimen/timeline_size" android:layout_height="match_parent"/&gt; &lt;fragment class="xxx.TaskInstanceFragment" android:id="@+id/details_frag" android:layout_width="match_parent" android:layout_height="match_parent" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>and a single-pane layout in portrait mode</p> <p>res\layout\dashboard_activity.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" &gt; &lt;fragment class="xxx.DashboardFragment" android:id="@+id/master_frag" android:layout_width="match_parent" android:layout_height="match_parent" /&gt; &lt;/FrameLayout&gt; </code></pre> <p>I want to note that the DashboardFragment consists of a ViewPager. Do not know if it is of importance.</p> <p>Now, when I change the orientation from landscape (dual) to portrait (single) the app crashes, because it wants to update the <code>details_frag</code>. When I start the activity in portrait, it works, only switching from landscape to portrait makes problems.</p> <p>In the activity there is the following code:</p> <pre><code>@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.dashboard_activity); Fragment frag = getSupportFragmentManager().findFragmentById(R.id.details_frag); mDualFragments = frag != null; /* .. */ } </code></pre> <p>Now the <code>FragmentManager</code> still finds the details fragment when I switch to portrait mode and thus <code>mDualFragments</code> is still true but should be false, which leads to a later call to a method in the details fragment.</p> <p>So, why is this? :)</p> <p>Regards, Konsumierer</p>
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