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我從其他類調用繪製疊加方法,我無法繪製覆蓋圖。我得到如下異常。請檢查並給我一個解決方案。從非擴展mapview類調用mapview
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)