我正在使用大约2年前编写的代码库（因此，我想知道API端的某些内容是否发生了更改而导致此问题）。还知道它已经工作了两年，所以我无法想象这是代码本身的问题...我想我只是没有正确设置API。
无论如何，我有Google Maps API在Fragment内创建地图。我创建了一个新的API密钥，并相信已按照这些说明正确设置了新密钥。每当我运行该应用程序时，Google徽标就会加载到该片段的左下角。这向我表明，与API进行了一些通信。但是，没有地图显示。只有米色的屏幕。
我尝试过几次API设置过程，但运气不佳。阅读了其他文章，指出AndroidManifest.xml中的某些更改后，我尝试更改存储在标记中的信息，但没有任何改变。
MapViewFragment.java
public class MapViewFragment extends Fragment {
MapView mMapView;
private GoogleMap googleMap;
final int MY_MAPS_REQUEST = 31415;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.map_view, container, false);
mMapView = (MapView) rootView.findViewById(R.id.mapView);
//final ImageButton returnButton = (ImageButton) rootView.findViewById(R.id.returnLocationButton);
mMapView.onCreate(savedInstanceState);
mMapView.onResume(); // needed to get the map to display immediately
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
mMapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
// For showing a move to my location button
/*String[] permissionRequests = new String[1];
permissionRequests[0] = Manifest.permission.ACCESS_FINE_LOCATION;
ActivityCompat.requestPermissions(getActivity(),permissionRequests,0);*/
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
Manifest.permission.ACCESS_FINE_LOCATION) || ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
Manifest.permission.ACCESS_COARSE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION},
MY_MAPS_REQUEST);
// MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
// app-defined int constant. The callback method gets the
// result of the request.
}
}
else{
googleMap.setMyLocationEnabled(true);
}
/* some points dropped here, but removed because its not relevant */
// For zooming automatically to the location of the marker
final CameraPosition cameraPositionWetlands = new CameraPosition.Builder().target(centerPoint).zoom(15).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPositionWetlands));
}
});
return rootView;
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_MAPS_REQUEST: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay!
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED || ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
googleMap.setMyLocationEnabled(true);
}
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
@Override
public void onResume() {
super.onResume();
if(mMapView != null) {
mMapView.onResume();
}
}
@Override
public void onPause() {
super.onPause();
if(mMapView != null) {
mMapView.onPause();
}
}
@Override
public void onDestroy() {
super.onDestroy();
if(mMapView != null) {
mMapView.onDestroy();
}
}
@Override
public void onLowMemory() {
super.onLowMemory();
if(mMapView != null) {
mMapView.onLowMemory();
}
}
}
map_view.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.gms.maps.MapView
android:id="@+id/mapView"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".MapViewFragment"
android:name="com.google.android.gms.maps.SupportMapFragment" />
<ImageButton
android:id="@+id/returnLocationButton"
android:layout_width="38dp"
android:layout_height="38dp"
android:layout_marginTop="60dp"
android:layout_marginRight="12dp"
android:layout_alignParentRight="true"
android:background="@drawable/rounded_rectangle"
android:scaleType="fitCenter"
app:srcCompat="@drawable/ic_action_return_location" />
</RelativeLayout>
google_maps_api.xml
<resources>
<!--
TODO: Before you run your application, you need a Google Maps API key.
To get one, follow this link, follow the directions and press "Create" at the end:
You can also add your credentials to an existing key, using these values:
Package name:
***
SHA-1 certificate fingerprint:
***
Alternatively, follow the directions here:
https://developers.google.com/maps/documentation/android/start#get-key
Once you have your key (it starts with "AIza"), replace the "google_maps_key"
string in this file.
-->
<string name="google_maps_key" translatable="false">AIza************************************</string>
</resources>
更新：刚刚发现此堆栈跟踪隐藏在我的运行时控制台中。
E/Google Maps Android API: Authorization failure. Please see https://developers.google.com/maps/documentation/android-api/start for how to correctly set up the map.
E/Google Maps Android API: In the Google Developer Console (https://console.developers.google.com)
Ensure that the "Google Maps Android API v2" is enabled.
Ensure that the following Android Key exists:
API Key: AIza***********************************
Android Application (<cert_fingerprint>;<package_name>): cert:finger:print;com.project.name