Android code Baidu map screenshot can not show content?

Use Baidu own screenshot method can, and inevitably will be more novices stepped pit.

mBaiduMap.snapshot(new BaiduMap.SnapshotReadyCallback() {
                        @Override
                        public void onSnapshotReady(Bitmap bitmap) {
                            image.setImageBitmap(bitmap);
                        }
                    });

Original image portion, the lower portion is a screenshot Nianshang Qu