title: java.lang.ClassCastException:fragment cannot be cast to android.support.v4.app.Fragment
body: <p>I am trying to implement Tab Navigation, I have a Container Activity that extends Fragment Activity, and this Activity creates a TabView using an ActionBar. The app will try to create three tabs and add them to the ActionBar, and I want to change the fragment depending on the TabSelection..But occured an error <code>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</code>.</p>
  
  <p><strong>TruckActivity.java</strong></p>
  
  <pre><code>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 &lt; 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;
          }
      }
  
  }
  </code></pre>
  
  <p><strong>fragment_truck_dummy.xml</strong></p>
  
  <pre><code>&lt;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" &gt;
  
      &lt;!-- &lt;TextView
          android:id="@+id/section_label"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:textColor="#FFF" /&gt; --&gt;
     &lt;fragment
          android:id="@+id/sub_frag"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          class="com.freight.fragments.TruckStatus"       /&gt;   
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p><strong>TruckStatus.java</strong></p>
  
  <pre><code>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;
      }
  
  }
  </code></pre>
  
  <p><strong>My LogCat</strong></p>
  
  <pre><code>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
  </code></pre>
  
  <p>Am using Android 4.2.2 APIs 17..Does anybody have any idea about it?</p>