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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. I'm using fragments in an Activity , with a ViewPager 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 ViewPager , so I tried to build an XML layout like that : <....> <LinearLayout android:id="@+id/fragmentsParent" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" > <fragment android:id="@+id/f1" android:class="com.test.Fragment1" android:layout_width="0dip" android:layout_height="match_parent" android:layout_weight="1" /> <fragment android:id="@+id/f2" android:name="com.test.Fragment2" android:layout_width="0dip" android:layout_height="match_parent" android:layout_weight="1" /> </LinearLayout> </....> 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 : 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 a

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