请高手帮忙指点下 什么问题。logcat07-05 07:13:25.011: ERROR/AndroidRuntime(284): Uncaught handler: thread main exiting due to uncaught exception
07-05 07:13:25.021: ERROR/AndroidRuntime(284): java.lang.RuntimeException: Unable to start activity ComponentInfo{mars.activity02/mars.activity02.Activity02}: java.lang.ClassCastException: mars.activity02.Activity02$MyButtonListener
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.os.Handler.dispatchMessage(Handler.java:99)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.os.Looper.loop(Looper.java:123)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread.main(ActivityThread.java:4203)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at java.lang.reflect.Method.invokeNative(Native Method)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at java.lang.reflect.Method.invoke(Method.java:521)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at dalvik.system.NativeStart.main(Native Method)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): Caused by: java.lang.ClassCastException: mars.activity02.Activity02$MyButtonListener
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at mars.activity02.Activity02.onCreate(Activity02.java:18)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): ... 11 more
07-05 07:13:25.021: ERROR/AndroidRuntime(284): java.lang.RuntimeException: Unable to start activity ComponentInfo{mars.activity02/mars.activity02.Activity02}: java.lang.ClassCastException: mars.activity02.Activity02$MyButtonListener
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.os.Handler.dispatchMessage(Handler.java:99)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.os.Looper.loop(Looper.java:123)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread.main(ActivityThread.java:4203)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at java.lang.reflect.Method.invokeNative(Native Method)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at java.lang.reflect.Method.invoke(Method.java:521)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at dalvik.system.NativeStart.main(Native Method)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): Caused by: java.lang.ClassCastException: mars.activity02.Activity02$MyButtonListener
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at mars.activity02.Activity02.onCreate(Activity02.java:18)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
07-05 07:13:25.021: ERROR/AndroidRuntime(284): ... 11 more
是类型强制换异常
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;public class Activity02 extends Activity {
/** Called when the activity is first created. */
private Button myButton= null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton =(Button) findViewById(R.id.myButton);
myButton.setOnClickListener((android.view.View.OnClickListener) new MyButtonListener());
} class MyButtonListener implements OnClickListener{ @Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Intent intent =new Intent();
intent.setClass(Activity02.this,OtherActivity.class);
Activity02.this.startActivity(intent);
}
这句错了MyButtonListener不是View.OnClickListener类型的,要定义成下面的
class MyButtonListener implements View.OnClickListener{
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
}
button.setOnClickListener(new Button.OclickListener(){
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
});