java - 谷歌地图在 Android 中的选项卡 fragment 上显示灰色

Question

我正在尝试使用谷歌地图创建一个选项卡，但它显示为灰色，并且角落里有谷歌 Logo 。我已将 API key 放入调试和发布 XML 中，尝试创建新的 API key 和与其他答案不同的解决方案。但没有一个起作用，logcat 没有给我任何错误，我怀疑它与 Activity 代码有关。如果有人可以帮助我，我将不胜感激。

这是我的 map Activity

import android.os.Bundle;

import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.hackathon.R;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
/**
 * A simple {@link Fragment} subclass.
 */
public class MapTab extends Fragment implements OnMapReadyCallback {

    SupportMapFragment mapFragment;

    public MapTab() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_map, container, false);
        mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);


        if(mapFragment == null){
            FragmentManager fm = getFragmentManager();
            FragmentTransaction ft = fm.beginTransaction();
            mapFragment = SupportMapFragment.newInstance();
            ft.replace(R.id.map, mapFragment).commit();
        }

        mapFragment.getMapAsync(this);
        return view;
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {

    }
}

这是我的 xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.main.MapTab" >
    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.MapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</FrameLayout>

我的 list

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.hackathon">
    <!--
         The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
         Google Maps Android API v2, but you must specify either coarse or fine
         location permissions for the 'MyLocation' functionality.
    -->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <!--
             The API key for Google Maps-based APIs is defined as a string resource.
             (See the file "res/values/google_maps_api.xml").
             Note that the API key is linked to the encryption key used to sign the APK.
             You need a different API key for each encryption key, including the release key that is used to
             sign the APK for publishing.
             You can define the keys for the debug and release targets in src/debug/ and src/release/.
        -->
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />

        <activity
            android:name=".ui.main.MapsActivity"
            android:label="@string/title_activity_maps" />
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Answer 1

您没有在异步方法中声明 map 回调。

在 fragment 中尝试这个

更新

这是我的工作代码

public class MapFragment extends Fragment {


        public MapFragment() {
            // Required empty public constructor
        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            // Inflate the layout for this fragment
            View rootView = inflater.inflate(R.layout.fragment_map, container, false);

            SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.frg);  //use SuppoprtMapFragment for using in fragment instead of activity  MapFragment = activity   SupportMapFragment = fragment
            mapFragment.getMapAsync(new OnMapReadyCallback() {
                @Override
                public void onMapReady(GoogleMap mMap) {
                    mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

                    mMap.clear(); //clear old markers

                    CameraPosition googlePlex = CameraPosition.builder()
                            .target(new LatLng(37.4219999,-122.0862462))
                            .zoom(10)
                            .bearing(0)
                            .tilt(45)
                            .build();

                    mMap.animateCamera(CameraUpdateFactory.newCameraPosition(googlePlex), 10000, null);


                    mMap.addMarker(new MarkerOptions()
                            .position(new LatLng(37.4629101,-122.2449094))
                            .title("Iron Man")
                            .snippet("His Talent : Plenty of money"));

                    mMap.addMarker(new MarkerOptions()
                            .position(new LatLng(37.3092293,-122.1136845))
                            .title("Captain America"));
                }
            });


            return rootView;
        }
       }

XML 代码

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MapFragment">

    <fragment
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:id="@+id/frg"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</FrameLayout>