Android 保存地图标记引用

我想知道是否有人可以帮助我，我正在尝试在ConcurrentHashMap中保存对新创建的标记的引用，我似乎在存储引用时没有问题，但当我尝试检索它时，应用程序崩溃并抛出NullPointer异常，下面是我如何存储和检索我的标记

将其存储在

mMarkers

中，这是

私有映射mMarkers=new ConcurrentHashMap（）

在出现故障时将其删除

map.setOnMapLongClickListener(new OnMapLongClickListener() {

        @Override
        public void onMapLongClick(LatLng point) {

            Marker marker = mMarkers.get(point);

            marker.remove(); //fails here
            mMarkers.remove(point);             
        }
    });

我使用标记的位置作为存储它的键

04-06 16:52:05.535: E/AndroidRuntime(26601): FATAL EXCEPTION: main
04-06 16:52:05.535: E/AndroidRuntime(26601): java.lang.NullPointerException
04-06 16:52:05.535: E/AndroidRuntime(26601):    at com.grim.pipboid.FragmentMap$1.onMapLongClick(FragmentMap.java:154)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at com.google.android.gms.maps.GoogleMap$7.onMapLongClick(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at com.google.android.gms.maps.internal.j$a.onTransact(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at android.os.Binder.transact(Binder.java:310)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at euq.a(SourceFile:93)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.c.j.b(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.ay.an.c(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.ay.bc.onLongPress(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.bo.g.onLongPress(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.bo.h.c(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.bo.i.handleMessage(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at android.os.Looper.loop(Looper.java:137)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at android.app.ActivityThread.main(ActivityThread.java:5227)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at java.lang.reflect.Method.invokeNative(Native Method)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at java.lang.reflect.Method.invoke(Method.java:511)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at dalvik.system.NativeStart.main(Native Method)

感谢您阅读
用户可以长时间单击地图上的任何位置。它不必位于现有标记的精确纬度和经度。因此，您的
LatLng
在
HashMap
中不存在，但在这种情况下，用户不存在，因为我只是在测试并按下标记。你能提出一个更好的方法吗？没关系，我明白你的意思了，我已经把它添加到了OnMarkerClick的听众中，谢谢你。
04-06 16:52:05.535: E/AndroidRuntime(26601): FATAL EXCEPTION: main
04-06 16:52:05.535: E/AndroidRuntime(26601): java.lang.NullPointerException
04-06 16:52:05.535: E/AndroidRuntime(26601):    at com.grim.pipboid.FragmentMap$1.onMapLongClick(FragmentMap.java:154)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at com.google.android.gms.maps.GoogleMap$7.onMapLongClick(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at com.google.android.gms.maps.internal.j$a.onTransact(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at android.os.Binder.transact(Binder.java:310)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at euq.a(SourceFile:93)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.c.j.b(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.ay.an.c(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.ay.bc.onLongPress(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.bo.g.onLongPress(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.bo.h.c(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at maps.bo.i.handleMessage(Unknown Source)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at android.os.Looper.loop(Looper.java:137)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at android.app.ActivityThread.main(ActivityThread.java:5227)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at java.lang.reflect.Method.invokeNative(Native Method)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at java.lang.reflect.Method.invoke(Method.java:511)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
04-06 16:52:05.535: E/AndroidRuntime(26601):    at dalvik.system.NativeStart.main(Native Method)