解决方法
您可以将GeoPoint投影到Point,并检查是否为(0,屏幕宽度)(0,屏幕高度)
见：https://developer.android.com/reference/com/google/android/gms/maps/Projection.html
见：https://developer.android.com/reference/com/google/android/gms/maps/Projection.html
