谷歌地图获取（可视）边界区域，东北角和西南角的坐标

try {
            LatLngBounds curScreen = gmap.getProjection()
                    .getVisibleRegion().latLngBounds;
            System.out.println(curScreen.toString());

            //top-left corner
            double topleftlatitude=curScreen.northeast.latitude;
            double topleftlongitude=curScreen.southwest.longitude;
            System.out.println("top left==>"+topleftlatitude+"" +topleftlongitude);


            //bottom-right corner
            double bottomrightlatitude=curScreen.southwest.latitude;
            double bottomrightlongitude=curScreen.northeast.longitude;
            System.out.println("bottom right==>"+bottomrightlatitude+"" +bottomrightlongitude);
        } catch (Exception e) {
            e.printStackTrace();
        }