android自定义旋钮按下效果

import android.content.Context;import android.graphics.Color;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.RelativeLayout;public class HCButton extends RelativeLayout{	private Button mButton;	private ImageView mImage; 	public HCButton(Context context, AttributeSet attrs){	    super(context,attrs);   	    mButton = new Button(context, attrs);	    mImage = new ImageView(context);	    setBackgroundDrawable(null);	    	    OnTouchListener onTouchListener = new OnTouchListener() {					public boolean onTouch(View arg0, MotionEvent arg1) {				// TODO Auto-generated method stub				if(arg1.getAction() == MotionEvent.ACTION_DOWN){ 				    mImage.setLayoutParams(new LayoutParams(mButton.getWidth(),mButton.getHeight()));				    mImage.setBackgroundColor(Color.BLACK);				    mImage.getBackground().setAlpha(100);                }else if(arg1.getAction() == MotionEvent.ACTION_UP){  				    mImage.setBackgroundColor(Color.TRANSPARENT);                }				return false;			}		};				mImage.setClickable(false);		mButton.setClickable(false);		setOnTouchListener(onTouchListener);	    	    addView(mButton);	    addView(mImage); 	}	public void changeBg(int resid){		mButton.setBackgroundResource(resid);	}		public void changeValue(String val){		mButton.setText(val);	}}