Android 中的 Google Maps API 显示空白屏幕

Question

I've been trying to get Google maps to work in Android Studios.

When creating a new project using the Google maps template, it works fine. However when I implement the map in my existing project, all it displays is a grey screen with the logo in the bottom left.

The existing project uses a fragment navigation system with a single activity that hosts all the other fragments classes. But this shouldn't be the cause of the issue because I implemented the map the same way as in the template, and it didn't work either.

I've checked the Logcat output, and there isn't an error for key validation. If I change the key then the error appears.

Here's the code for the fragment class that contains the map:

    public class MapFragment extends Fragment implements OnMapReadyCallback {

    private MapViewModel dashboardViewModel;

    private GoogleMap mMap;

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        dashboardViewModel =
                ViewModelProviders.of(this).get(MapViewModel.class);
        View root = inflater.inflate(R.layout.fragment_map, container, false);

        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) this.getChildFragmentManager().findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        return root;
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        LatLng testLocation = new LatLng(50, -2);
        mMap.moveCamera(CameraUpdateFactory.newLatLng(testLocation));
    }

}

This is my manifest file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.backintyne">

    <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">

        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />

        <activity
            android:name=".MainActivity"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Thanks in advance

Answer 1

The error usually could be caused by any of the following:

• using an API key but from a project without a valid billing account
• using an invalid/incorrect/malformed API key
• using an API key which is restricted to other applications aside from your own
• Maps SDK for Android is not enabled on your project

Make sure you are using an API key from a project that has a valid billing account since it is stated in Maps SDK for Android documentation that before you can start using the Google Maps Platform APIs and SDKs, you must sign up and create a billing account.

If your API key has restrictions, make sure that it is properly restricted according to the API key best practices . Make sure that you have enabled Maps SDK for Android for your maps project in the GCP console.

Lastly, if you are still having issues, feel free to file a support case to open a personalized communication channel.