从非扩展mapview类调用mapview

Question

我正在调用另一个类的draw overlay方法，我无法绘制覆盖图。我得到了如下异常。请检查并给我一个解决方案。

java.lang.NullPointerException
   at com.google.android.maps.ItemizedOverlay.boundCenter(ItemizedOverlay.java:173)
   at com.lifedots.mapoverlaydraw.MyItemizedOverlay.<init>(MyItemizedOverlay.java:34)
   at com.lifedots.BalloonItemizedOverlay.onTap(BalloonItemizedOverlay.java:124)
   at com.google.android.maps.ItemizedOverlay.onTap(ItemizedOverlay.java:453)
   at com.google.android.maps.OverlayBundle.onTap(OverlayBundle.java:83)
   at com.google.android.maps.MapView$1.onSingleTapUp(MapView.java:356)
   at com.google.android.maps.GestureDetector.onTouchEvent(GestureDetector.java:533)
   at com.google.android.maps.MapView.onTouchEvent(MapView.java:683)
   at android.view.View.dispatchTouchEvent(View.java:3885)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)

Answer 1

你能提供代码吗，看起来你用过BalloonItemizedOverlay，我用过这个也许我能帮上忙，没有代码我不能算出错误。(如果您提供了代码，将进行编辑)