title: Android - class is not a view android.support.v4.fragment
body: <p>I have to use fragment, with v4 support, but I've got an error crashing the App.
  I can't find the solution!</p>
  
  <p>This is my code :</p>
  
  <p><strong>activity_advert_list.xml :</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="horizontal" &gt;
  
  &lt;android.support.v4.app.Fragment
      android:id="@+id/advertListFragment"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:name="com.myapp.fragment.AdvertListFragment"/&gt;
  </code></pre>
  
  <p> </p>
  
  <p><strong>AdvertListActivity.java</strong></p>
  
  <pre><code>package com.myapp.app;
  import java.util.ArrayList;
  import com.myapp.R;
  import com.myapp.classmodel.Advert;
  import com.myapp.fragment.AdvertDetailFragment;
  import com.myapp.interf.OnAdvertSelectedListener;
  import com.google.analytics.tracking.android.EasyTracker;
  import android.os.Bundle;
  import android.support.v4.app.FragmentActivity;
  
  public class AdvertListActivity extends FragmentActivity implements     OnAdvertSelectedListener {
  private AdvertListActivity activity = this;
  
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_advert_list);
  }
  
  @Override
  public void onStart() {
      super.onStart();
      // Google Analytics
      EasyTracker.getInstance().activityStart(this);
  }
  
  @Override
  public void onStop() {
      super.onStop();
      // Google Analytics
      EasyTracker.getInstance().activityStop(this);
  }
  
  
  /**
   * Called by fragment
   * Used to pass advertList &amp; current position to detail fragment
   */
  @Override
  public void onAdvertItemSelected(ArrayList&lt;Advert&gt; advertList, int currentPosition) {
      AdvertDetailFragment fragment = (AdvertDetailFragment) activity.getSupportFragmentManager().findFragmentById(R.id.advertDetailFragment);
      if (fragment != null &amp;&amp; fragment.isInLayout()) {
          fragment.setData(advertList, currentPosition);
      } 
  }
  
  }
  </code></pre>
  
  <p><strong>EDIT</strong></p>
  
  <p><strong>Logcat with android.support.v4.app.Fragment :</strong></p>
  
  <pre><code>04-22 11:09:48.223: E/AndroidRuntime(30349): FATAL EXCEPTION: main
  04-22 11:09:48.223: E/AndroidRuntime(30349): java.lang.RuntimeException: Unable to start    activity ComponentInfo{com.myapp/com.myapp.app.AdvertListActivity}:    android.view.InflateException: Binary XML file line #7: Class is not a View android.support.v4.app.Fragment
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.os.Handler.dispatchMessage(Handler.java:99)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at    android.os.Looper.loop(Looper.java:137)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.app.ActivityThread.main(ActivityThread.java:5041)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at java.lang.reflect.Method.invokeNative(Native Method)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at java.lang.reflect.Method.invoke(Method.java:511)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at dalvik.system.NativeStart.main(Native Method)
  04-22 11:09:48.223: E/AndroidRuntime(30349): Caused by: android.view.InflateException: Binary XML file line #7: Class is not a View android.support.v4.app.Fragment
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.view.LayoutInflater.createView(LayoutInflater.java:604)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.app.Activity.setContentView(Activity.java:1881)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at com.myapp.app.AdvertListActivity.onCreate(AdvertListActivity.java:19)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.app.Activity.performCreate(Activity.java:5104)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    ... 11 more
  04-22 11:09:48.223: E/AndroidRuntime(30349): Caused by: java.lang.ClassCastException: android.support.v4.app.Fragment cannot be cast to android.view.View
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at java.lang.Class.asSubclass(Class.java:1380)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    at android.view.LayoutInflater.createView(LayoutInflater.java:552)
  04-22 11:09:48.223: E/AndroidRuntime(30349):    ... 22 more
  </code></pre>
  
  <p><strong>Logcat with fragment</strong></p>
  
  <pre><code>04-22 11:07:39.950: E/AndroidRuntime(30107): FATAL EXCEPTION: main
  04-22 11:07:39.950: E/AndroidRuntime(30107): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp/com.myapp.app.AdvertListActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.os.Handler.dispatchMessage(Handler.java:99)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.os.Looper.loop(Looper.java:137)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.app.ActivityThread.main(ActivityThread.java:5041)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at java.lang.reflect.Method.invokeNative(Native Method)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at java.lang.reflect.Method.invoke(Method.java:511)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at dalvik.system.NativeStart.main(Native Method)
  04-22 11:07:39.950: E/AndroidRuntime(30107): Caused by: android.view.InflateException:  Binary XML file line #7: Error inflating class fragment
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.app.Activity.setContentView(Activity.java:1881)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at  com.myapp.app.AdvertListActivity.onCreate(AdvertListActivity.java:19)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at  android.app.Activity.performCreate(Activity.java:5104)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    ... 11 more
  04-22 11:07:39.950: E/AndroidRuntime(30107): Caused by: java.lang.NullPointerException
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at com.myapp.fragment.AdvertListFragment.onCreateView(AdvertListFragment.java:63)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:846)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1061)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1160)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
  04-22 11:07:39.950: E/AndroidRuntime(30107):    ... 21 more
  </code></pre>