java.lang.RuntimeException：无法启动活动ComponentInfo无法转换为android.widget.ZoomControls

我是新来的android开发人员，希望大家能帮助我。我从互联网上获得了这个androidVNC查看器源代码。当我在模拟器中运行androidVNC应用程序时，它会自动退出，然后在LogCat中出现以下错误。任何人都可以帮助我吗？谢谢。java.lang.RuntimeException：无法启动活动ComponentInfo无法转换为android.widget.ZoomControls

FATAL EXCEPTION: main 
java.lang.RuntimeException: Unable to start activity ComponentInfo{android.androidVNC/android.androidVNC.VncCanvasActivity}:  java.lang.ClassCastException: com.antlersoft.android.zoomer.ZoomControls cannot be cast to  android.widget.ZoomControls 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) 
at android.app.ActivityThread.access$600(ActivityThread.java:122) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:137) 
at android.app.ActivityThread.main(ActivityThread.java:4340) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:511) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
at dalvik.system.NativeStart.main(Native Method) 
Caused by: java.lang.ClassCastException: com.antlersoft.android.zoomer.ZoomControls  cannot be cast to android.widget.ZoomControls 
at android.androidVNC.VncCanvasActivity.onCreate(VncCanvasActivity.java:585) 
at android.app.Activity.performCreate(Activity.java:4465) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919) 
... 11 more

这是了ZoomControls的java文件：

package com.antlersoft.android.zoomer; 

import android.content.Context; 
import android.util.AttributeSet; 
import android.view.LayoutInflater; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.animation.AlphaAnimation; 
import android.widget.ImageButton; 
import android.widget.LinearLayout; 
import android.widget.ZoomButton; 


public class ZoomControls extends LinearLayout { 

private final ZoomButton mZoomIn; 
private final ZoomButton mZoomOut; 
private final ImageButton mZoomKeyboard; 

public ZoomControls(Context context) { 
    this(context, null); 
} 

public ZoomControls(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    setFocusable(false); 

    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    inflater.inflate(R.layout.zoom_controls, this, // we are the parent 
      true); 

    mZoomIn = (ZoomButton) findViewById(R.id.zoomIn); 
    mZoomOut = (ZoomButton) findViewById(R.id.zoomOut); 
    mZoomKeyboard = (ImageButton) findViewById(R.id.zoomKeys); 
} 

public void setOnZoomInClickListener(OnClickListener listener) { 
    mZoomIn.setOnClickListener(listener); 
} 

public void setOnZoomOutClickListener(OnClickListener listener) { 
    mZoomOut.setOnClickListener(listener); 
} 

public void setOnZoomKeyboardClickListener(OnClickListener listener) { 
    mZoomKeyboard.setOnClickListener(listener); 
} 

/* 
* Sets how fast you get zoom events when the user holds down the 
* zoom in/out buttons. 
*/ 
public void setZoomSpeed(long speed) { 
    mZoomIn.setZoomSpeed(speed); 
    mZoomOut.setZoomSpeed(speed); 
} 

@Override 
public boolean onTouchEvent(MotionEvent event) { 

    /* Consume all touch events so they don't get dispatched to the view 
    * beneath this view. 
    */ 
    return true; 
} 

public void show() { 
    fade(View.VISIBLE, 0.0f, 1.0f); 
} 

public void hide() { 
    fade(View.GONE, 1.0f, 0.0f); 
} 

private void fade(int visibility, float startAlpha, float endAlpha) { 
    AlphaAnimation anim = new AlphaAnimation(startAlpha, endAlpha); 
    anim.setDuration(500); 
    startAnimation(anim); 
    setVisibility(visibility); 
} 

public void setIsZoomInEnabled(boolean isEnabled) { 
    mZoomIn.setEnabled(isEnabled); 
} 

public void setIsZoomOutEnabled(boolean isEnabled) { 
    mZoomOut.setEnabled(isEnabled); 
} 

@Override 
public boolean hasFocus() { 
    return mZoomIn.hasFocus() || mZoomOut.hasFocus(); 
}

}

这是zoom_controls XML文件：

<merge xmlns:android="http://schemas.android.com/apk/res/android"> 
<ZoomButton android:id="@+id/zoomOut" 
    android:background="@drawable/btn_zoom_down" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    /> 
<ImageButton android:id="@+id/zoomKeys" 
    android:background="@android:drawable/ic_dialog_dialer" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    /> 
<ZoomButton android:id="@+id/zoomIn" 
    android:background="@drawable/btn_zoom_up" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    /> 
</merge>

来源

2012-12-07 Hwl

可能有些代码可以帮助我们找到问题。但错误很明显，你正在将'com.antlersoft.android.zoomer.ZoomControls'转换为'android.widget.ZoomControls' –

@MMohsinNaeem检查我的答案。 –

@AliImran为什么？这与我在评论中写的一样！ –

您正在使用错误的import使用这种com.antlersoft.android.zoomer.ZoomControls代替android.widget.ZoomControls

来源

2012-12-07 16:31:27

java.lang.RuntimeException：无法启动活动ComponentInfo无法转换为android.widget.ZoomControls

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