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; } }

           

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