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POClassCastException: CustomFragment cannot be cast to android.app.Fragment / Using android.support.v4.app.Fragment
 

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  1. POClassCastException: CustomFragment cannot be cast to android.app.Fragment / Using android.support.v4.app.Fragment
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    <p>I am developing an application divided in one library and two applications : 1 for phones, the other for tablets. A lot of code and layout is defined in the library, and only a few parts are defined in the applications.</p> <p>I'm using fragments in an <code>Activity</code>, with a <code>ViewPager</code> for the phone version (layout and activity defined in the library, used with no change in the phone application). For the tablet version, I want to show my fragments (2) side by side, and not in a <code>ViewPager</code>, so I tried to build an XML layout like that :</p> <pre><code>&lt;....&gt; &lt;LinearLayout android:id="@+id/fragmentsParent" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" &gt; &lt;fragment android:id="@+id/f1" android:class="com.test.Fragment1" android:layout_width="0dip" android:layout_height="match_parent" android:layout_weight="1" /&gt; &lt;fragment android:id="@+id/f2" android:name="com.test.Fragment2" android:layout_width="0dip" android:layout_height="match_parent" android:layout_weight="1" /&gt; &lt;/LinearLayout&gt; &lt;/....&gt; </code></pre> <p>My problem is that the code is working on my phone application, but not on my tablet application. On this one, I get this exception stack :</p> <pre><code>07-11 17:41:14.032: E/AndroidRuntime(14754): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1050) 07-11 17:41:14.032: E/AndroidRuntime(14754): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1782) 07-11 17:41:14.032: E/AndroidRuntime(14754): ... 11 more 07-11 17:41:14.032: E/AndroidRuntime(14754): Caused by: java.lang.ClassCastException: com.test.Fragment1 cannot be cast to android.app.Fragment 07-11 17:41:14.032: E/AndroidRuntime(14754): at android.app.Fragment.instantiate(Fragment.java:560) 07-11 17:41:14.032: E/AndroidRuntime(14754): at android.app.Fragment.instantiate(Fragment.java:535) 07-11 17:41:14.032: E/AndroidRuntime(14754): at android.app.Activity.onCreateView(Activity.java:4168) 07-11 17:41:14.032: E/AndroidRuntime(14754): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:664) </code></pre> <p>The error messages talk about <code>android.app.Fragment</code> where I Would expect <code>android.support.v4.app.Fragment</code>.</p> <p>After searching the web, I checked these points :</p> <ul> <li>My activity extends <code>android.support.v4.app.FragmentActivity</code>,</li> <li>My fragments extend <code>android.support.v4.app.Fragment</code>,</li> <li>My application uses the support.v4 library.</li> </ul>
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    1. USelbaquero
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    1. COHave you tried using thr full support library package name in your XML insrtead of just `Fragment`?
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    2. COI can't have access to my code at this moment, but this is something I've tried and, if I remember correctly, a crash occurred too. I'll try again tomorrow and I'll post the exception raised.
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    3. COI've tried again, and had this result : 07-12 09:40:25.760: E/AndroidRuntime(4503): Caused by: java.lang.ClassCastException: android.support.v4.app.Fragment cannot be cast to android.view.View
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