Android Button 的按下和抬起事件监听

public class AppMain extends Activity{  
      
    private Button mButton;  
      
    /** Called when the activity is first created. */  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        ButtonListener b = new ButtonListener();         
        mButton = (Button)findViewById(R.id.button1);  
        mButton.setOnClickListener(b);  
        mButton.setOnTouchListener(b);  
        mButton.setBackgroundResource(R.drawable.green);  
          
    }  
      
    class ButtonListener implements OnClickListener, OnTouchListener{  
  
        public void onClick(View v) {  
            if(v.getId() == R.id.button1){  
                Log.d("test", "cansal button ---> click");  
            }  
        }  
  
        public boolean onTouch(View v, MotionEvent event) {  
            if(v.getId() == R.id.button1){  
                if(event.getAction() == MotionEvent.ACTION_UP){  
                    Log.d("test", "cansal button ---> cancel");  
                    mButton.setBackgroundResource(R.drawable.green);  
                }   
                if(event.getAction() == MotionEvent.ACTION_DOWN){  
                    Log.d("test", "cansal button ---> down");  
                    mButton.setBackgroundResource(R.drawable.yellow);  
                }  
            }  
            return false;  
        }  
          
    }  
}