Error inflating class錯誤

09-13 16:24:00.996: ERROR/AndroidRuntime(929): FATAL EXCEPTION: main
09-13 16:24:00.996: ERROR/AndroidRuntime(929): android.view.InflateException: Binary XML file line #2: Error inflating class com.android.launcher2.AllApps2D$BackHomeZone
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.view.LayoutInflater.createView(LayoutInflater.java:503)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:565)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.view.LayoutInflater.inflate(LayoutInflater.java:385)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at com.android.launcher2.AllApps2D.onItemLongClick(AllApps2D.java:264)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.widget.AbsListView.performLongPress(AbsListView.java:1753)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.widget.AbsListView.access$600(AbsListView.java:72)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.widget.AbsListView$CheckForLongPress.run(AbsListView.java:1711)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.os.Handler.handleCallback(Handler.java:587)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.os.Handler.dispatchMessage(Handler.java:92)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.os.Looper.loop(Looper.java:123)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.app.ActivityThread.main(ActivityThread.java:4627)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at java.lang.reflect.Method.invokeNative(Native Method)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at java.lang.reflect.Method.invoke(Method.java:521)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at dalvik.system.NativeStart.main(Native Method)
09-13 16:24:00.996: ERROR/AndroidRuntime(929): Caused by: java.lang.NoSuchMethodException: BackHomeZone(Context,AttributeSet)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at java.lang.Class.getMatchingConstructor(Class.java:660)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at java.lang.Class.getConstructor(Class.java:477)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     at android.view.LayoutInflater.createView(LayoutInflater.java:475)
09-13 16:24:00.996: ERROR/AndroidRuntime(929):     ... 17 more

我遇到這種錯誤有過兩種不同的原因：

1、沒有定義inflate需要的默認構造函數；

2、這是個內部類，需要聲明爲static才能inflate；

關於自定義組件，還需要注意的一點是，如果時內部類，這個類就不能作爲layout中的節點的名稱，而必須用view作爲節點名，然後加入一個class屬性，值爲該內部類的引用，比如launcher中又下面這樣一個例子：

<view
    class="com.android.launcher2.AllApps2D$HomeButton"
    android:id="@+id/all_apps_2d_home"
    android:tag="all_apps_2d_home"
    android:src="@drawable/home_button"
    android:background="#FF000000"
    android:layout_centerHorizontal="true"
    android:layout_alignParentBottom="true"
    android:layout_width="wrap_content"
    android:layout_height="@dimen/button_bar_height"
    android:nextFocusUp="@+id/all_apps_2d_grid"
    android:nextFocusDown="@null"
    android:nextFocusLeft="@null"
    android:nextFocusRight="@null"
    />