更新地图时Android谷歌地图上的NullPointer异常

Question

我最近在我的应用程序中包含了ACRA,其中包括一个GoogleMapSupportFragment.我现在得到一些崩溃报告,我无法在我的设备上重现.如果我想在地图上放置新的标记,应用程序会崩溃.每个标记都与一个位置连接,该位置还有其他信息(地址,名称,......).

这是我的班级管理 GoogleMap

public SignManager(MainActivity activity, GoogleMap map) {
    mActivity = activity;
    this.mMap = map;

    initMap();
}


private void initMap() {
    mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    mMap.setMyLocationEnabled(true);
    //...
}

这是函数,它(有时)会抛出NullPointerException.该功能updateSignsInView是由一个称为LocalBroadcast从AsyncTasks,其接收与新的更新Markers从服务器.

public void updateSignsInView(LocationWO[] mSignArray) {

    if(mSignArray == null){
        Log.e(DEBUG_TAG,"updateSignsInView() -> mSignArray null");
        return;
    }

    resetMap();  //delete some unneeded data and do mMap.clear()

    mMarkerLocationMap = new HashMap<Marker, LocationWO>();

    for (int i = 0; i < mSignArray.length; i++) {

        //!!! this is the bad line: SignManager.java:101  
        Marker marker = mMap.addMarker(createMapMarker(mSignArray[i])); 

        mMarkerLocationMap.put(marker, mSignArray[i]);
    }

}


 //create a new Marker with given information
 private MarkerOptions createMapMarker(LocationWO mLocation) {

    MarkerOptions mMarker = new MarkerOptions()
    .position(
        new LatLng(mLocation.getmLatitude(), mLocation
            .getmLongitude()))
    .title(mLocation.getmName()
            .icon(BitmapDescriptorFactory.fromBitmap(icon));

    return mMarker;
}

这是我收到的LogCat:

USER_COMMENT=null
ANDROID_VERSION=4.1.1
APP_VERSION_NAME=0.9
BRAND=htc_europe
PHONE_MODEL=HTC One X
CUSTOM_DATA=
STACK_TRACE=java.lang.NullPointerException
at maps.aj.bk.a(Unknown Source)
at maps.aj.bk.a(Unknown Source)
at maps.aj.al.a(Unknown Source)
at bcn.onTransact(SourceFile:167)
at android.os.Binder.transact(Binder.java:326)
at com.google.android.gms.maps.internal.IGoogleMapDelegate$a$a.addMarker(Unknown Source)
at com.google.android.gms.maps.GoogleMap.addMarker(Unknown Source)
at MYAPP.SignManager.updateSignsInView(SignManager.java:101)
at MYAPP.MainActivity$1.onReceive(MainActivity.java:389)
at android.support.v4.content.LocalBroadcastManager.executePendingBroadcasts(LocalBroadcastManager.java:297)
at android.support.v4.content.LocalBroadcastManager.access$000(LocalBroadcastManager.java:46)
at android.support.v4.content.LocalBroadcastManager$1.handleMessage(LocalBroadcastManager.java:116)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5493)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795)
at dalvik.system.NativeStart.main(Native Method)

我99.99%肯定,这mMap不可能null.在onCreate()方法中设置mMap.

任何想法？

编辑:setupMap功能

private void setUpMapIfNeeded() {

    if (mMap == null) {
        mMap = ((SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map_screen)).getMap();

        if (mMap != null) {
            setUpMap();
        }
    }
}

Answer 1

这里的问题是icon通过的null.

但是如果Bitmap-Icon为null,那么它不应该在createMarker()方法中崩溃吗？或者它会在以后崩溃,因为地图上没有图标tp位置？

是的,它会更好,如果它抛出NPE里面直接GoogleMap.addMarker或BitmapDescriptorFactory.fromBitmap,但它不会发生在您的里面createMapMarker,除非你调用一个方法icon.

这是不可能的null,因为问题中没有相关的代码,但我怀疑当用户离开应用程序并在以后重新创建时,进程被终止.