以编程方式创建MapView和添加标记会导致片段中出现空指针异常

问题描述

我正在尝试以编程方式创建MapView并添加MarkerPosition，如下所示:

I am trying to create a MapView programmatically and add a MarkerPosition as shown below:

MapView mapView = new MapView(getActivity());
((ViewGroup) rootView).addView(mapView);

GoogleMap googleMap = mapView.getMap();
googleMap.addMarker(new MarkerOptions()
        .position(new LatLng(
                Double.parseDouble(
                        mEvent.getEventInfo().mEventData.mLat),
                Double.parseDouble(
                        mEvent.getEventInfo().mEventData.mLng)))
        .title("Marker"));

清单文件:

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />

<permission
    android:name="com.example.permission.MAPS_RECEIVE"
    android:protectionLevel="signature" />

<uses-permission android:name="com.example.permission.MAPS_RECEIVE" />

我遇到以下错误:

java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.model.Marker com.google.android.gms.maps.GoogleMap.addMarker(com.google.android.gms.maps.model.MarkerOptions)' on a null object reference

推荐答案

，因为您的googleMap尚未加载，但表示null，并且您要在其上添加标记，从而导致崩溃.最好使用mapView.getMapAsync(context);而不是mapView.getMap();并实现此方法

because your googleMap is not loaded yet means null and you are adding marker on it which is causing a crash. better to use mapView.getMapAsync(context); rather than mapView.getMap(); and implement this method

    @Override
    public void onMapReady(final GoogleMap map) {
        if(map != null){
        // you are ready to add marker here        
        }
    }

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