title: Error inflating class android.view.ViewGroup
body: <p>I am trying to write a custom view for checkboxPreferences. I have:</p>
  
  <pre><code>&lt;CheckBoxPreference
   android:key="@string/pref_acceptableads"
   android:summaryOff="@string/pref_acceptableads_summary_off"
   android:summaryOn="@string/pref_acceptableads_summary_on"
   android:title="@string/pref_acceptableads_title"
   android:widgetLayout="@layout/helpfulcheckbox_layout" /&gt;
  </code></pre>
  
  <p>and:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;ViewGroup xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+android:id/widget_frame"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"&gt;
    &lt;ImageView
      android:id="@+id/image"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:src="@drawable/image" /&gt;
    &lt;CheckBox
      android:id="@+id/checkbox"
      android:layout_width="0dp"
      android:layout_height="wrap_content" /&gt;
  &lt;/ViewGroup&gt;
  </code></pre>
  
  <p>Problem is with my viewgroup. I receive an exception:</p>
  
  <blockquote>
    <p>03-11 13:49:11.520: E/AndroidRuntime(12286): FATAL EXCEPTION: main
    03-11 13:49:11.520: E/AndroidRuntime(12286): Process:
    org.adblockplus.android, PID: 12286 03-11 13:49:11.520:
    E/AndroidRuntime(12286): android.view.InflateException: Binary XML
    file line #2: Error inflating class android.view.ViewGroup 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.LayoutInflater.createView(LayoutInflater.java:620) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.LayoutInflater.onCreateView(LayoutInflater.java:652)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.view.LayoutInflater.inflate(LayoutInflater.java:469) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.LayoutInflater.inflate(LayoutInflater.java:397) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.LayoutInflater.inflate(LayoutInflater.java:353) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.preference.Preference.onCreateView(Preference.java:489) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.preference.Preference.getView(Preference.java:460) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.preference.PreferenceGroupAdapter.getView(PreferenceGroupAdapter.java:221)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.widget.AbsListView.obtainView(AbsListView.java:2255) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.widget.ListView.makeAndAddView(ListView.java:1790) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.widget.ListView.fillDown(ListView.java:691) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.widget.ListView.fillFromTop(ListView.java:752) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.widget.ListView.layoutChildren(ListView.java:1616) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.widget.AbsListView.onLayout(AbsListView.java:2087) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.View.layout(View.java:14841) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    android.view.ViewGroup.layout(ViewGroup.java:4631) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.widget.LinearLayout.onLayout(LinearLayout.java:1434) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.View.layout(View.java:14841) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    android.view.ViewGroup.layout(ViewGroup.java:4631) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.widget.FrameLayout.onLayout(FrameLayout.java:388) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.View.layout(View.java:14841) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    android.view.ViewGroup.layout(ViewGroup.java:4631) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:374)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.view.View.layout(View.java:14841) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    android.view.ViewGroup.layout(ViewGroup.java:4631) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.widget.FrameLayout.onLayout(FrameLayout.java:388) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.View.layout(View.java:14841) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    android.view.ViewGroup.layout(ViewGroup.java:4631) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1983) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1740)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.view.Choreographer.doCallbacks(Choreographer.java:574) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.Choreographer.doFrame(Choreographer.java:544) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    android.os.Handler.handleCallback(Handler.java:733) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.os.Handler.dispatchMessage(Handler.java:95) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.os.Looper.loop(Looper.java:136) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    android.app.ActivityThread.main(ActivityThread.java:5139) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    java.lang.reflect.Method.invokeNative(Native Method) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    java.lang.reflect.Method.invoke(Method.java:515) 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
    03-11 13:49:11.520: E/AndroidRuntime(12286):  at
    com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    dalvik.system.NativeStart.main(Native Method) 03-11 13:49:11.520:
    E/AndroidRuntime(12286): Caused by: java.lang.InstantiationException:
    can't instantiate class android.view.ViewGroup 03-11 13:49:11.520:
    E/AndroidRuntime(12286):  at
    java.lang.reflect.Constructor.constructNative(Native Method) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    java.lang.reflect.Constructor.newInstance(Constructor.java:423) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    at
    android.view.LayoutInflater.createView(LayoutInflater.java:594) 03-11
    13:49:11.520: E/AndroidRuntime(12286):    ... 51 more</p>
  </blockquote>
  
  <p>Can you give me a hit what is going on?</p>