Question

我在framelayout中动态添加了我的谷歌地图片段。现在我想把标记和谷歌地图做其他的东西。但我无法通过get片段管理器访问它。代码显示没有错误，但是当它执行时，它返回空指针异常。

我认为它的逻辑错误。与类型铸造有关。请帮忙

这是我的＆＃34; nearby_places.xml＆＃34;布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/map_area"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <com.localiteproximus.CustomAutoCompleteTextView
    android:id="@+id/atv_places"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"        
    android:layout_alignParentTop="true"
    android:hint="@string/str_atv_places"
    android:singleLine="true" />

    <FrameLayout
    android:id="@+id/mapView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    class="com.google.android.gms.maps.SupportMapFragment"
    android:layout_below="@id/atv_places">

</FrameLayout>
</RelativeLayout>

这是我的班级

public class NearByPlaceFragment extends Fragment {

public NearByPlaceFragment(){}

View rootView;
GoogleMap googleMap;

public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        MapFragment fragment = new MapFragment();
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
        transaction.add(R.id.mapView, fragment).commit();
 rootView = inflater.inflate(R.layout.nearby_places, container, false);

  googleMap = ((MapFragment) getFragmentManager().findFragmentById(
                    R.id.map)).getMap();
 return rootView

}

和LogCat显示此

58.608: E/AndroidRuntime(12654): FATAL EXCEPTION: main
03-22 03:00:58.608: E/AndroidRuntime(12654): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.localiteproximus/com.localiteproximus.NearbyPlaces}: android.view.InflateException: Binary XML file line #21: Class is not a View com.google.android.gms.maps.MapFragment
03-22 03:00:58.608: E/AndroidRuntime(12654):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2294)
03-22 03:00:58.608: E/AndroidRuntime(12654): Caused by: java.lang.ClassCastException: com.google.android.gms.maps.MapFragment cannot be cast to android.view.View
03-22 03:00:58.608: E/AndroidRuntime(12654):    at java.lang.Class.asSubclass(Class.java:1182)
03-22 03:00:58.608: E/AndroidRuntime(12654):    at android.view.LayoutInflater.createView(LayoutInflater.java:565)
03-22 03:00:58.608: E/AndroidRuntime(12654):    ... 23 more

Answer 1

我自己得到了答案。

所以这真是一个愚蠢的错误.6小时后我发现错误就在这条线上

googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.mapView)).getMap();

获取其父视图而不是子视图，因此将其替换为此行

googleMap = ((MapFragment) getChildFragmentManager().findFragmentById(R.id.mapView)).getMap();

一切都很好:)。

在framelayout中访问动态添加的谷歌地图片段

1 个答案: