public LatLng getMapCenterPoint() {
int left = mMapView.getLeft();
int top = mMapView.getTop();
int right = mMapView.getRight();
int bottom = mMapView.getBottom();
// 获得屏幕点击的位置
int x = (int) (mMapView.getX() + (right - left) / 2);
int y = (int) (mMapView.getY() + (bottom - top) / 2);
Projection projection = mAMap.getProjection();
LatLng pt = projection.fromScreenLocation(new Point(x, y));
return pt;
}