MapView Overlay Drawable 的使用

package org.yexing.mapdemos; 


GraphicOverlay.java 


import android.graphics.Canvas; 
//import android.graphics.Paint; 
//import android.graphics.RectF; 
import android.graphics.drawable.BitmapDrawable; 
import android.graphics.drawable.Drawable; 
import android.view.MotionEvent; 


import com.google.android.maps.Overlay; 
import com.google.android.maps.Point; 


public class GraphicOverlay extends Overlay { 
        BitmapDrawable bmp; 
        static int w, h; 
        Point p; 


        public GraphicOverlay(Drawable d, Point p) { 
                bmp = (BitmapDrawable) d; 
                this.p = p; 
                w = bmp.getIntrinsicWidth(); 
                h = bmp.getIntrinsicHeight(); 
        } 


        public void draw(Canvas canvas, PixelCalculator calculator, boolean 
shadow) { 
                calculator.getPointXY(p, sXYCoords); 
                bmp.setBounds(sXYCoords[0] - w / 2, sXYCoords[1] - h, 
                                sXYCoords[0] + w / 2, sXYCoords[1]); 
                bmp.setAlpha(70); 
                bmp.draw(canvas); 


                /* 
                RectF oval = new RectF(xyCoords[0], xyCoords[1], 
                                xyCoords[0] + 5, xyCoords[1] + 5); 


                Paint paint = new Paint(); 
                paint.setARGB(200, 255, 0, 0); 
                canvas.drawOval(oval, paint); 
                */ 
        } 


        public Point getCenter() { 
                return p; 
        } 


        public boolean dispatchMotionEvent(MotionEvent ev) { 
                return false; 
        } 



}

 在引用的时候把一个activity作为参数传进

public GraphicOverlay(Activity map) 
{ 
    mMap = map; 
    ... 

}

 bmp = mMap.getIcon("name")

Point p = mMap.getCurrentLocation()

或者

nMap = map; 
fav_icon = (BitmapDrawable) 
mMap.getResources().getDrawable(R.drawable.cake);