Aktivität kann nicht gewirkt werden, um android.Unterstützung.v4.app.Fragment

Ich versuche zu ändern meine App, die eine Reihe von einzelnen Tätigkeiten in eine swipe-tab-app.
ich möchte 3 Aktivitäten in der swipe tabs. Verwendet habe ich das google-Beispiel, welches eclipse für mich geschaffen. Ich weiß nicht scheinen, um die richtige Art, das zu tun.

Habe ich folgende (relevante) code (das andere Zeug ist in eclipse, es ist zu viel das hier zu posten):

Main.class die aufgerufen wird beim Start (der Letzte innere Klasse für sich):

public static class DummySectionFragment extends Fragment {


public static final String ARG_SECTION_NUMBER = "section_number";

        //public DummySectionFragment() {
        //}

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {

            View rootView = inflater.inflate(R.layout.activity_fragment,
                    container, false);

            return rootView;
        }
    }

activity_fragment.xml:

<fragment
    android:id="@+id/main"
    android:name="com.mikebdev.refuel.MainActivity"
    class="com.mikebdev.refuel.MainActivity"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1" />

<fragment
    android:id="@+id/stats"
    android:name="com.mikebdev.refuel.Statistics"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="2" />

<fragment
    android:id="@+id/refuel"
    android:name="com.mikebdev.refuel.ReFuel"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="3" />

Aktivitäten, an denen alle erweitern FragmentActivity aus android.support.v4.app.FragmentActivity

nun beim Start meiner app, bekomme ich die folgende Fehlermeldung:

04-27 12:08:11.244: E/AndroidRuntime(28728): FATAL EXCEPTION: main
04-27 12:08:11.244: E/AndroidRuntime(28728): android.view.InflateException: Binary XML file line #8: Error inflating class fragment
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at com.mikebdev.refuel.Main$DummySectionFragment.onCreateView(Main.java:184)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.view.ViewPager.populate(ViewPager.java:1011)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.view.ViewPager.populate(ViewPager.java:880)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1374)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.View.measure(View.java:15518)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.View.measure(View.java:15518)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.View.measure(View.java:15518)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.View.measure(View.java:15518)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.Choreographer.doCallbacks(Choreographer.java:562)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.Choreographer.doFrame(Choreographer.java:532)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.os.Handler.handleCallback(Handler.java:725)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.os.Handler.dispatchMessage(Handler.java:92)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.os.Looper.loop(Looper.java:137)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.app.ActivityThread.main(ActivityThread.java:5041)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at java.lang.reflect.Method.invokeNative(Native Method)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at java.lang.reflect.Method.invoke(Method.java:511)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at dalvik.system.NativeStart.main(Native Method)
04-27 12:08:11.244: E/AndroidRuntime(28728): Caused by: java.lang.ClassCastException: com.mikebdev.refuel.MainActivity cannot be cast to android.support.v4.app.Fragment
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.app.Fragment.instantiate(Fragment.java:394)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.app.Fragment.instantiate(Fragment.java:369)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
04-27 12:08:11.244: E/AndroidRuntime(28728):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
InformationsquelleAutor mike.b93 | 2013-04-27
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