android 百度地图 通过剪裁图片添加 Marker

1 private void initViews() {
2 4         mMapView = (MapView) findViewById(R.id.bmapView);
5         mBaiduMap = mMapView.getMap();
6         // 初始化地图范围级别
7         MapStatusUpdate msu = MapStatusUpdateFactory.zoomTo(14.0f);
8         mBaiduMap.setMapStatus(msu);
9     }

// 初始化bitmap 信息，不用时及时 recycle
BitmapDescriptor friend_1;

1 friend_1 = BitmapDescriptorFactory.fromBitmap(
2                     BMapUtil.createCircleImage(BitmapFactory.decodeResource(getResources(), R.drawable.friend_1), 90));

 1 /**
 2      * 根据原图和变长绘制圆形图片
 3      * @param source
 4      * @param min
 5      * @return
 6      */
 7     public static Bitmap createCircleImage(Bitmap source, int radius) {
 8         Bitmap scaledSrcBmp;
 9         int diameter = radius * 2;
10         // 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片
11         int bmpWidth = source.getWidth();
12         int bmpHeight = source.getHeight();
13         int squareWidth = 0, squareHeight = 0;
14         int x = 0, y = 0;
15         Bitmap squareBitmap;
16         if (bmpHeight > bmpWidth) {// 高大于宽
17             squareWidth = squareHeight = bmpWidth;
18             x = 0;
19             y = (bmpHeight - bmpWidth) / 2;
20             // 截取正方形图片
21             squareBitmap = Bitmap.createBitmap(source, x, y, squareWidth,
22                     squareHeight);
23         } else if (bmpHeight < bmpWidth) {// 宽大于高
24             squareWidth = squareHeight = bmpHeight;
25             x = (bmpWidth - bmpHeight) / 2;
26             y = 0;
27             squareBitmap = Bitmap.createBitmap(source, x, y, squareWidth,
28                     squareHeight);
29         } else {
30             squareBitmap = source;
31         }
32         if (squareBitmap.getWidth() != diameter
33                 || squareBitmap.getHeight() != diameter) {
34             scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
35                     diameter, true);
36         } else {
37             scaledSrcBmp = squareBitmap;
38         }
39         Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
40                 scaledSrcBmp.getHeight(), Config.ARGB_8888);
41         Canvas canvas = new Canvas(output);
42 
43         Paint paint = new Paint();
44         Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
45                 scaledSrcBmp.getHeight());
46 
47         paint.setAntiAlias(true);
48         paint.setFilterBitmap(true);
49         paint.setDither(true);
50         canvas.drawARGB(0, 0, 0, 0);
51         canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
52                 scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,
53                 paint);
54         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
55         canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
56         bmp = null;
57         squareBitmap = null;
58         scaledSrcBmp = null;
59         return output;
60     }

1 LatLng position_1 = new LatLng(39.963175, 116.400244);

1 OverlayOptions ooA = new MarkerOptions().position(position_1).icon(friend_1)
2                 .zIndex(9).draggable(true);

1 mMarkerA = (Marker) (mBaiduMap.addOverlay(ooA));

mBaiduMap.setOnMarkerClickListener(new OnMarkerClickListener() {
            public boolean onMarkerClick(final Marker marker) {
       // todo 判断mMarkerA 的点击事件    
   }
}

@Override
    protected void onPause() {
        // MapView的生命周期与Activity同步，当activity挂起时需调用MapView.onPause()
        mMapView.onPause();
        super.onPause();
    }

    @Override
    protected void onResume() {
        // MapView的生命周期与Activity同步，当activity恢复时需调用MapView.onResume()
        mMapView.onResume();
        super.onResume();
    }

    @Override
    protected void onDestroy() {
        // MapView的生命周期与Activity同步，当activity销毁时需调用MapView.destroy()
        mMapView.onDestroy();
        super.onDestroy();
        // 回收 bitmap 资源
        friend_1.recycle();
    }