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);