Android开发经验之点击图片判断是否在图片范围之内

package xiaosi.grivaty;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.view.MotionEvent;
import android.view.View;

public class Rects extends View
{

    private Bitmap bitmap = null;
    private float x,y;
    public Rects(Context context)
    {
        super(context);
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);
        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.v);
        canvas.drawBitmap(bitmap, 0, 0, null);

        //创建和位图一样位置的Rect
        Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        if(rect.contains((int)x, (int)y)){
            System.out.println("范围之内");
        }
        else{
            System.out.println("范围之外");
        }
        System.out.println("图片宽度：" + bitmap.getWidth() + "图像高度：" + bitmap.getHeight());
        System.out.println("点击X：" + x + "点击Y：" + y);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event)
    {
        if (event.getAction() == MotionEvent.ACTION_DOWN)
        {
            x = event.getX();
            y = event.getY();
            // 重绘
            invalidate();
        }
        return true;
    }

}