Question

我正在尝试将google map导入到我的xamarin.android应用程序中。我将密钥和编写的代码设置如下`

 protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            SetContentView(Resource.Layout.Maps);

            SetUpMap();

            FindViewElements();
        }

      private void SetUpMap()
        {
            if (mMap == null)
            {
                    var _mapFragment = FragmentManager.FindFragmentByTag("maptag") as MapFragment;//null

                    var mapFragment = (MapFragment)FragmentManager.FindFragmentById(Resource.Id.map);//null

                    // var mapFragment = FragmentManager.FindFragmentById<MapFragment>(Resource.Id.map);//Here are also null

                   // var _mapFragment = SupportFragmentManager.FindFragmentById(Resource.Id.map) as SupportMapFragment; /null           
}
        }
     protected override async void FindViewElements()
        {
            _mapsModel = new MapsModel
                {
                    MapsFragment = FragmentManager.FindFragmentById<MapFragment>(Resource.Id.map),
                    MapTypeSpinner = FindViewById<Spinner>(Resource.Id.spinner),
                    Toolbar = FindViewById<Toolbar>(Resource.Id.mapToolbar),
                };

                SetSupportActionBar(_mapsModel.Toolbar);

                SupportActionBar.Title = "Maps";

                SupportActionBar.SetHomeButtonEnabled(true);

                SupportActionBar.SetDisplayHomeAsUpEnabled(true);

                _mapsModel.MapsFragment.GetMapAsync(this);

                _mapsModel.MapTypeSpinner.ItemSelected += MapTypeSpinner_ItemSelected;
        }

我的axml如下

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:id="@+id/header">
        <include
            android:id="@+id/mapToolbar"
            layout="@layout/toolbar" />
    </RelativeLayout>
    <Spinner
        android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:entries="@array/maptype_arrays" />
    <fragment
        android.id="@+id/map"
        android:tag="maptag"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:name="com.google.android.gms.maps.SupportMapFragment"/>
</LinearLayout>

我尝试了所有可能的方法，例如将Fragment替换为suppportFragment，但没有任何帮助。谁能建议我实现这一目标。

预先感谢

Answer 1

我尝试您的axml，并且得到的结果作为您，因此我建议您可以在FrameLayout中添加片段，以便可以通过ID获得该片段。像这样：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
    android:id="@+id/zoomInButton"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Zoom In" />
<Button
    android:id="@+id/zoomOutButton"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Zoom Out" />
<Button
    android:id="@+id/animateButton"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Animate to Location" />
<FrameLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <fragment
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.MapFragment" />
</FrameLayout>

 var mapFragment = (MapFragment)FragmentManager.FindFragmentById(Resource.Id.map);

var mapFragment =（MapFragment）FragmentManager.FindFragmentById（Resource.Id.map）;

您还可以查看有关在项目中导入Google地图的MSDN文档： https://docs.microsoft.com/en-us/xamarin/android/platform/maps-and-location/maps/maps-api

（MapFragment）FragmentManager.FindFragmentById（Resource.Id.map）始终将null调整为null

1 个答案: