我正在尝试构建一个使用 GoogleClientApi 和 LocationServices 请求当前位置的应用程序，但即使我启用了 WiFi、Mobile Data 和 GPS，位置始终为空，并在多个设备上进行了相同的测试
manifest.xml 的权限：
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
活动：
public class FindStation extends Fragment implements GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener,com.google.android.gms.location.LocationListener
{
public static FragmentManager fragmentManager;
Button goButton;
Spinner spinner;
SupportMapFragment mapFragment;
GoogleMap map;
List<Stations> stationsList;
ArrayList<String> stationsAddresses;
private static View view;
ArrayList<MarkerOptions> markers;
GoogleApiClient mGoogleApiClient;
LocationServices locationServices;
Location location;
private static String TAG="FIND_STATION";
Context context;
LocationRequest mLocationRequest;
LocationListener locationListener;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
context= getActivity();
locationListener=this;
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(10000);
mLocationRequest.setFastestInterval(5000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setSmallestDisplacement(10);
/*mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();*/
buildGoogleApiClient();
if (view != null) {
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null)
parent.removeView(view);
}
try {
view = inflater.inflate(R.layout.activity_find_station, container, false);
} catch (InflateException e) {
}
inflater.inflate(R.layout.activity_find_station,container,false);
stationsAddresses = new ArrayList<>();
goButton= (Button) view.findViewById(R.id.button);
//goButton.setVisibility(View.INVISIBLE);
spinner= (Spinner) view.findViewById(R.id.spinner);
stationsList = Stations.listAll(Stations.class);
markers = new ArrayList<>();
for (int i = 0; i <stationsList.size() ; i++) {
stationsAddresses.add(stationsList.get(i).getStationLocation());
markers.add(new MarkerOptions().position(new LatLng(stationsList.get(i).getStationLat(), stationsList.get(i).getStationLong())).title(stationsList.get(i).getStationName()));
}
goButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//location= LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
}
});
try {
initialize();
} catch (Exception e) {
e.printStackTrace();
}
try {
// map.setMyLocationEnabled(true);
} catch (Exception e) {
e.printStackTrace();
}
/*thread = new Thread(new MyThread());
thread.start();*/
return view;
}
private void initialize() {
if (map==null) {
Fragment fragment= getChildFragmentManager().findFragmentById(R.id.map);
mapFragment= (SupportMapFragment) fragment;
map=mapFragment.getMap();
for (int i = 0; i <markers.size() ; i++) {
map.addMarker(markers.get(i));
}
// check if map is created successfully or not
if (map==null) {
Toast.makeText(super.getActivity(),
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
}
}
}
public void onDestroyView() {
super.onDestroyView();
android.support.v4.app.FragmentManager fm = getActivity().getSupportFragmentManager();
SupportMapFragment fragment = (SupportMapFragment) fm.findFragmentById(R.id.map);
if (fragment!=null) {
android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
ft.remove(fragment);
ft.commit();
}
}
@Override
public void onConnected(Bundle bundle) {
location= LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (location!=null){
Log.d(TAG,location.toString());
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(),location.getLongitude()),3f);
map.animateCamera(update);
}
Log.d(TAG,"connected");
}
@Override
public void onConnectionSuspended(int i) {
Log.d(TAG,"connection suspended "+String.valueOf(i));
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.d(TAG,"connection failed");
}
@Override
public void onLocationChanged(Location location) {`enter code here`
Log.d(TAG,location.toString());
this.location=location;
if (location!=null) {
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(), location.getLongitude()), 3f);
map.animateCamera(update);
Log.d(TAG, "camera updated to new position");
goButton.setVisibility(View.VISIBLE);
}
}
@Override
public void onStart() {
super.onStart();
mGoogleApiClient.connect();
Log.d(TAG,"connect() was called");
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(context)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
}
奇怪的是调用了 onConnect() 方法，但之后 Location 始终为 null 并且永远不会调用 onLocationChanged()
使用地图，我尝试启用我的位置，当您在右上角有按钮时，它可以返回位置并为相机设置动画。
更新 1
更新了 onConnected() 方法并使其请求位置更新，
public void onConnected(Bundle bundle) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, locationListener);
if (location!=null){
Log.d(TAG,location.toString());
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(),location.getLongitude()),3f);
map.animateCamera(update);
}
Log.d(TAG,"connected");}
然后我用一个按钮调用 lastKnownLocation() 因为 onLocationChanged() 仍然没有被调用，并且返回的 Location 仍然是 null
更新 2：
完全相同的代码在 Android 5.0.1 上运行，并且在所有其他设备上运行良好，在 android 2.3.7、4.0.1 上都没有工作，
知道关于位置的 Android API 有什么不同吗？