java.lang.ClassCastException:fragment ne peut être lancé pour android.de soutien.v4.app.Fragment

Je suis en train de mettre en œuvre la Navigation par onglets, j'ai un Conteneur d'Activité qui s'étend Fragment de l'Activité, et cette Activité crée un TabView à l'aide d'une ActionBar. L'application va essayer de créer trois onglets et les ajouter à l'ActionBar, et je veux changer le fragment selon la TabSelection..Mais s'est produite une erreur 07-04 12:17:33.534: E/AndroidRuntime(795): Caused by: java.lang.ClassCastException: com.freight.fragments.TruckStatus cannot be cast to android.support.v4.app.Fragment.

TruckActivity.java

package com.freight.activities;
import java.util.Locale;
import com.clacion.freightexchange.R;
import com.clacion.freightexchange.R.drawable;
import com.clacion.freightexchange.R.id;
import com.clacion.freightexchange.R.layout;
import com.clacion.freightexchange.R.menu;
import com.clacion.freightexchange.R.string;
import com.freight.fragments.TruckStatus;
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class TruckActivity extends FragmentActivity implements
ActionBar.TabListener {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_truck);
//Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//Create the adapter that will return a fragment for each of the three
//primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
//Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
//When swiping between different sections, select the corresponding
//tab. We can also use ActionBar.Tab#select() to do this if we have
//a reference to the Tab.
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
//For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
//Create a tab with text corresponding to the page title defined by
//the adapter. Also specify this Activity object, which implements
//the TabListener interface, as the callback (listener) for when
//this tab is selected.
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setIcon(R.drawable.item_menu_config)                   
.setTabListener(this));
}
actionBar.setSelectedNavigationItem(0);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.truck, menu);
return true;
}
@Override
public void onTabSelected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
//When the given tab is selected, switch to the corresponding page in
//the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabReselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
//getItem is called to instantiate the fragment for the given page.
//Return a DummySectionFragment (defined as a static inner class
//below) with the page number as its lone argument.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
//Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_menu_truck1).toUpperCase(l);
case 1:
return getString(R.string.title_menu_truck2).toUpperCase(l);
case 2:
return getString(R.string.title_menu_truck3).toUpperCase(l);
}
return null;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* 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.fragment_truck_dummy,
container, false);
//         TextView dummyTextView = (TextView) rootView
//                 .findViewById(R.id.section_label);
//         dummyTextView.setText(Integer.toString(getArguments().getInt(
//                 ARG_SECTION_NUMBER)));
int pos=getArguments().getInt(ARG_SECTION_NUMBER);
if(pos==1){
//             dummyTextView.setText("Selected Truck");
}else if(pos==2){
//             dummyTextView.setText("Selected Tripsheet");
}else if(pos==3){
//             dummyTextView.setText("Selected Alerts");
}
return rootView;
}
}
}

fragment_truck_dummy.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="#000"
tools:context=".TruckActivity$DummySectionFragment" >
<!-- <TextView
android:id="@+id/section_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF" /> -->
<fragment
android:id="@+id/sub_frag"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.freight.fragments.TruckStatus"       />   
</RelativeLayout>

TruckStatus.java

package com.freight.fragments;
import com.clacion.freightexchange.R;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class TruckStatus extends Fragment {
@Override
public void onActivityCreated(Bundle savedInstanceState) {
//TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//TODO Auto-generated method stub
View v =inflater.inflate(R.layout.truck_status_fragment,
container, false);
return v;
}
}

Mon LogCat

07-04 12:17:33.534: E/AndroidRuntime(795): FATAL EXCEPTION: main
07-04 12:17:33.534: E/AndroidRuntime(795): android.view.InflateException: Binary XML file line #17: Error inflating class fragment
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
07-04 12:17:33.534: E/AndroidRuntime(795):  at com.freight.activities.TruckActivity$DummySectionFragment.onCreateView(TruckActivity.java:177)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.view.ViewPager.populate(ViewPager.java:1064)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.view.ViewPager.populate(ViewPager.java:911)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1432)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.View.measure(View.java:15518)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.View.measure(View.java:15518)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.View.measure(View.java:15518)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
07-04 12:17:33.534: E/AndroidRuntime(795):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.View.measure(View.java:15518)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.Choreographer.doCallbacks(Choreographer.java:562)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.Choreographer.doFrame(Choreographer.java:532)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.os.Handler.handleCallback(Handler.java:725)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.os.Handler.dispatchMessage(Handler.java:92)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.os.Looper.loop(Looper.java:137)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.app.ActivityThread.main(ActivityThread.java:5041)
07-04 12:17:33.534: E/AndroidRuntime(795):  at java.lang.reflect.Method.invokeNative(Native Method)
07-04 12:17:33.534: E/AndroidRuntime(795):  at java.lang.reflect.Method.invoke(Method.java:511)
07-04 12:17:33.534: E/AndroidRuntime(795):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-04 12:17:33.534: E/AndroidRuntime(795):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-04 12:17:33.534: E/AndroidRuntime(795):  at dalvik.system.NativeStart.main(Native Method)
07-04 12:17:33.534: E/AndroidRuntime(795): Caused by: java.lang.ClassCastException: com.freight.fragments.TruckStatus cannot be cast to android.support.v4.app.Fragment
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.app.Fragment.instantiate(Fragment.java:394)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.app.Fragment.instantiate(Fragment.java:369)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
07-04 12:17:33.534: E/AndroidRuntime(795):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
07-04 12:17:33.534: E/AndroidRuntime(795):  ... 43 more

Suis en utilisant Android 4.2.2 Api 17..est-ce que quelqu'un a une idée à ce sujet?