初始化百度地图：

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     }

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

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

初始化剪裁的图片（此处为生成圆形图片）：

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

圆形图片生成方法：

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() != diameter33                 || 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     }

初始化位置信息：

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

初始化OverlayOptions：

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

再通过addOverlay添加到地图：

1 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();    }