ClassCastException异常初始化CustomView

时，我有一个自定义的TextView看起来像这样：ClassCastException异常初始化CustomView

public class ClickTextView extends TextView { 

    public ClickTextView(Context context, AttributeSet attrs) { 
     super(context, attrs);  

    } 
    // and so on... 
}

为什么下面给我一个ClassCastException的代码？

@Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     // CLASS CAST EXCEPTION HERE, this is line 69 
     ClickTextView tvClicks = (ClickTextView) findViewById(R.id.tvClicks); 
    }

而下面是我的main.xml，其中我声明了包名称的ClickTextView。 main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/rlMain" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 

    <com.xxmassdeveloper.click.gui.ClickTextView 
    android:id="@+id/tvClicks" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_centerHorizontal="true" 
    android:layout_marginTop="4dp" 
    android:gravity="center" 
    android:text="1,000,000,000" 
    android:textSize="45dp" /> 

</RelativeLayout>

这里的错误日志：

04-07 19:52:44.536: E/AndroidRuntime(15589): FATAL EXCEPTION: main 
04-07 19:52:44.536: E/AndroidRuntime(15589): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xxmassdeveloper.click/com.xxmassdeveloper.click.ClickMain}: java.lang.ClassCastException: android.widget.TextView cannot be cast to com.xxmassdeveloper.click.gui.ClickTextView 
04-07 19:52:44.536: E/AndroidRuntime(15589): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2185) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2210) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at android.app.ActivityThread.access$600(ActivityThread.java:142) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1208) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at android.os.Looper.loop(Looper.java:137) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at android.app.ActivityThread.main(ActivityThread.java:4931) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at java.lang.reflect.Method.invokeNative(Native Method) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at java.lang.reflect.Method.invoke(Method.java:511) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at dalvik.system.NativeStart.main(Native Method) 
04-07 19:52:44.536: E/AndroidRuntime(15589): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to com.xxmassdeveloper.click.gui.ClickTextView 
04-07 19:52:44.536: E/AndroidRuntime(15589): at com.xxmassdeveloper.click.ClickMain.onCreate(ClickMain.java:69) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at android.app.Activity.performCreate(Activity.java:5008) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
04-07 19:52:44.536: E/AndroidRuntime(15589): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2139) 
04-07 19:52:44.536: E/AndroidRuntime(15589): ... 11 more

我已经做了重启Eclipse，和类似的东西项目的清洁。我也完全删除了设备上的应用程序并重新安装。

来源

2013-04-07 Philipp Jahoda

解决了，我在导致异常的.xml文件中犯了一个愚蠢的错误。

来源

2013-08-27 13:54:25

ClassCastException异常初始化CustomView

回答

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