ImageView点击可变暗的实例代码(android代码技巧)

import android.content.Context;
import android.graphics.ColorMatrixColorFilter;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
public class MyImageView extends ImageView{
  public MyImageView(Context context,AttributeSet attrs) {
    super(context,attrs);
    // TODO Auto-generated constructor stub
    this.setOnTouchListener(VIEW_TOUCH_DARK);
  }
  public static final OnTouchListener VIEW_TOUCH_DARK = new OnTouchListener() { 
    //变暗(三个-50，值越大则效果越深)
    public final float[] BT_@R_450_10288@CTED_DARK = new float[] { 1,-50,1,0 };
    /*
    //变亮
    public final float[] BT_@R_450_10288@CTED_LIGHT = new float[] { 1,50,0 };
    //恢复
    public final float[] BT_NOT_@R_450_10288@CTED = new float[] { 1,0 }; 
     */
    @Override 
    public Boolean onTouch(View v,MotionEvent event) { 
      if (event.getAction() == MotionEvent.ACTION_DOWN) {
        ImageView iv = (ImageView) v; 
        iv.setColorFilter(new ColorMatrixColorFilter(BT_@R_450_10288@CTED_DARK));
      } else if (event.getAction() == MotionEvent.ACTION_Up) {
        ImageView iv = (ImageView) v; 
        iv.clearColorFilter();
      } 
      return false; //如为false，执行ACTION_DOWN后不再往下执行
    } 
  }; 
}