扩展类android.view.ViewGroup时出错

Question

我正在尝试为checkboxPreferences编写自定义视图.我有:

<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" />

和:

<?xml version="1.0" encoding="UTF-8"?>
<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">
  <ImageView
    android:id="@+id/image"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:src="@drawable/image" />
  <CheckBox
    android:id="@+id/checkbox"
    android:layout_width="0dp"
    android:layout_height="wrap_content" />
</ViewGroup>

问题在于我的viewgroup.我收到一个例外:

03-11 13:49:11.520:E/AndroidRuntime(12286):FATAL EXCEPTION:main 03-11 13:49:11.520:E/AndroidRuntime(12286):进程:org.adblockplus.android,PID:12286 03-11 13:49:11.520:E/AndroidRuntime(12286):android.view.InflateException:二进制XML文件行#2:错误膨胀类android.view.ViewGroup 03-11 13:49:11.520:E/AndroidRuntime(12286):在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):在android.view.LayoutInflater.inflate(LayoutInfla)ter.java:469)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.view.LayoutInflater.inflate(LayoutInflater.java:397)03-11 13:49:11.520:E/AndroidRuntime( 12286):在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):在android.preference.Preference.getView(Preference.java:460)03-11 13:49:11.520:E/AndroidRuntime(12286):在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):在android.widget.ListView.makeAndAddView(ListView.java:1790)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.ListView.fillDown(ListView. java:691)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.ListView.fillFromTop(ListView.java:752)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.ListView.layoutChildren(ListView.java:1616)03-11 13:49:11.520:E/AndroidRuntime(12286):在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):在android.view.ViewGroup.layout(ViewGroup.java:4631)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.LinearLayout.setChildFrame(LinearLayout) .java:1671)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)03-11 13:49:11.520:E/AndroidRuntime(12286) ):在android.widget.LinearLayout.onLayout(LinearLayout.java:1434)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.view.View.layout(View.java:14841)03- 11 13:49:11.520:E/AndroidRuntime(12286):在android.view.ViewGroup.layout(ViewGroup.java:4631)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget. FrameL ayout.layoutChildren(FrameLayout.java:453)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.widget.FrameLayout.onLayout(FrameLayout.java:388)03-11 13:49:11.520: E/AndroidRuntime(12286):在android.view.View.layout(View.java:14841)03-11 13:49:11.520:E/AndroidRuntime(12286):在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):在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):在android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)03-11 13:49:11.520:E/AndroidRuntime(12286):在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/An droidRuntime(12286):在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):在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):在android.view.Choreographer $ CallbackRecord.run(Choreographer.java:761)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.view. Choreographer.doCallbacks(Choreographer.java:574)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.view.Choreographer.doFrame(Choreographer.java:544)03-11 13:49:11.520: E/AndroidRuntime(12286):在android.view.Choreographer $ FrameDisplayEventReceiver.run(Choreographer.java:747)03- 11 13:49:11.520:E/AndroidRuntime(12286):在android.os.Handler.handleCallback(Handler.java:733)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.os. Handler.dispatchMessage(Handler.java:95)03-11 13:49:11.520:E/AndroidRuntime(12286):在android.os.Looper.loop(Looper.java:136)03-11 13:49:11.520: E/AndroidRuntime(12286):在android.app.ActivityThread.main(ActivityThread.java:5139)03-11 13:49:11.520:E/AndroidRuntime(12286):at java.lang.reflect.Method.invokeNative(Native方法)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) :引起:java.lang.InstantiationE xception:无法实例化类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更多

你能告诉我发生了什么吗？

Answer 1

ViewGroup是一个抽象类.

使用另一个布局作为RelativeLayout或LinearLayout

在LogCat中你有:

E/AndroidRuntime(12286): Caused by: java.lang.InstantiationException: can't instantiate class android.view.ViewGroup