android 百度地图 通过剪裁图片添加 Marker

初始化百度地图：

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

--------------------华丽分割线-----------------------

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

初始化剪裁的图片（此处为生成圆形图片）：

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

圆形图片生成方法：

/**
     * 根据原图和变长绘制圆形图片
     * @param source
     * @param min
     * @return
     */
    public static Bitmap createCircleImage(Bitmap source, int radius) {
        Bitmap scaledSrcBmp;
        int diameter = radius * 2;
        // 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
        int bmpWidth = source.getWidth();
        int bmpHeight = source.getHeight();
        int squareWidth = 0, squareHeight = 0;
        int x = 0, y = 0;
        Bitmap squareBitmap;
        if (bmpHeight > bmpWidth) {// 高大于宽
            squareWidth = squareHeight = bmpWidth;
            x = 0;
            y = (bmpHeight - bmpWidth) / 2;
            // 截取正方形图片
            squareBitmap = Bitmap.createBitmap(source, x, y, squareWidth,
                    squareHeight);
        } else if (bmpHeight < bmpWidth) {// 宽大于高
            squareWidth = squareHeight = bmpHeight;
            x = (bmpWidth - bmpHeight) / 2;
            y = 0;
            squareBitmap = Bitmap.createBitmap(source, x, y, squareWidth,
                    squareHeight);
        } else {
            squareBitmap = source;
        }
        if (squareBitmap.getWidth() != diameter
                || squareBitmap.getHeight() != diameter) {
            scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
                    diameter, true);
        } else {
            scaledSrcBmp = squareBitmap;
        }
        Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
                scaledSrcBmp.getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        Paint paint = new Paint();
        Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
                scaledSrcBmp.getHeight());

        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        canvas.drawARGB(0, 0, 0, 0);
        canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
                scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,
                paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
        bmp = null;
        squareBitmap = null;
        scaledSrcBmp = null;
        return output;
    }

初始化位置信息：

LatLng position_1 = new LatLng(39.963175, 116.400244);

初始化OverlayOptions：

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

再通过addOverlay添加到地图：

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

注册setOnMarkerClickListener：

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

当退出时，释放资源：

@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();
    }