Overlay 添加动态效果

public class MyLocationOverlay extends Overlay { 
 
    private Canvas canvas; 
    private final Handler handler = new Handler(); 
    private Runnable runnable; 
    private GeoPoint geoPoint; 
    private int xMarker, yMarker; 
    private int markerNumber = 0; 
    private Bitmap marker, marker0, marker1, marker2, marker3; 
 
    public MyLocationOverlay(Context context) { 
        Resources r = context.getResources(); = BitmapFactory.decodeResource(r, R.drawable.marker); 
        marker1 = BitmapFactory.decodeResource(r, R.drawable.marker1); 
        marker2 = BitmapFactory.decodeResource(r, R.drawable.marker2); 
        marker3 = BitmapFactory.decodeResource(r, R.drawable.marker3); 
        marker = marker0; 
    } 
 
    /** 设置 位置*/ 
    public void setLocation(GeoPoint geoPoint) { 
        this.geoPoint = geoPoint; 
    } 
 
    /** 设置标记是动态还是静态*/ 
    public void animateMarker(boolean on) { 
    if (on) {    // activate animation 
        if (runnable == null) runnable = new Runnable() { 
            public void run() { 
                if (canvas!=null) {                      switch (markerNumber) { 
                    case 0: marker = marker0; break; 
                    case 1: marker = marker1; break; 
                    case 2: marker = marker2; break; 
                    case 3: marker = marker3; break; 
                    } 
                    markerNumber = ++markerNumber % 4; 
                    canvas.drawBitmap(marker, xMarker, yMarker, null); 
                    mapView.invalidate(xMarker, yMarker,  
                                    xMarker+wMarker, yMarker+hMarker); 
                } 
                handler.postDelayed(this, 500); 
            } 
        }; 
        handler.postDelayed(runnable, 500); 
    } else {    // 静态         marker0 
        handler.removeCallbacks(runnable); 
        runnable = null; 
        marker = marker0; 
    } 
} 
 
    @Override 
    public void draw(Canvas canvas, MapView mapView, boolean shadow) { 
        if (shadow == false) { 
            Projection projection = mapView.getProjection(); 
 
            // 转换坐标到屏幕像素       
            Point point = projection.toPixels(geoPoint, null); 
 
            // 记录canvas 和 标记位置 
            this.canvas = canvas; 
            xMarker = point.x - marker.getWidth()/2; 
            yMarker = point.y - marker.getHeight()/2; 
 
            // 绘画标记 在位置的中心
            canvas.drawBitmap(marker, xMarker, yMarker, null); 
        } 
        super.draw(canvas, mapView, shadow); 
    } 
 
    @Override 
    public boolean onTap(GeoPoint point, MapView mapView) { return false; } 
}  
然后在
MapActivity.onResume() 中调用locationOverlay = MyLocationOverlay(this) 

GeoPoint point = new GeoPoint(latE6, lonE6); 
    locationOverlay.setLocation(point); 
    locationOverlay.animateMarker(true); 
    mapView.getController().animateTo(point);