在android中，使用handler出现空指针异常

Question

public class Floating_windowActivity extends Activity {
private SliderRelativeLayout sliderLayout = null;
private Handler mHandler =new Handler (){
public void handleMessage(Message msg){
Log.i(TAG, "handleMessage : #### " );
if(MSG_LOCK_SUCESS == msg.what){
closeLig();
android.os.Process.killProcess(android.os.Process.myPid());
}
super.handleMessage(msg);
}
};

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    sliderLayout = (SliderRelativeLayout)findViewById(R.id.slider_layout);
    sliderLayout.setMainHandler(mHandler); // 运行到这里报空指针异常，求大神解释。。。
}

}

public class SliderRelativeLayout extends RelativeLayout {
public Handler mainHandler = null;
public void setMainHandler(Handler handler){
mainHandler = handler;//activity所在的Handler对象
}

private void handleActionUpEvent(MotionEvent event){
    Message message = new Message();  

    message.what = 1;   
    mainHandler.sendMessage(message);
}

}

Answer 1

你把super.handleMessage(msg); 移到上边试试。