android - 无法使用 Google 的融合位置 API 获取位置

Question

我正在尝试使用 Google 的融合位置 API 获取我的位置。为此，我创建了两个类。一个是 MainActivity，第二个是 FusedLocationService，其中 MainActivity 是主类。但我得到的经度和纬度为 0.0。所以请帮助我。

这是我的 MainActivity 代码:-

public class MainActivity extends AppCompatActivity {

TextView tvLocation;
FusedLocationService fusedLocationService;
double latitude;
double longitude;

String locationResult = "";
Location location;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    tvLocation = (TextView) findViewById(R.id.tvLocation);
    fusedLocationService = new FusedLocationService(this);
    location = fusedLocationService.getLocation();

    if (null != location) {
        latitude = location.getLatitude();
        longitude = location.getLongitude();
        locationResult = "Latitude: " + latitude + "\n" +
                "Longitude: " + longitude + "\n";
    } else {
        Timber.e("-error-%s", "Location Not Available!");
        locationResult = "Location Not Available!";
    }

    Log.e("Lati ", String.valueOf(latitude));
    Log.e("longi ", String.valueOf(longitude));
    tvLocation.setText(locationResult);
   }
 }

这是我的 FusedLocationService 类:-

public class FusedLocationService implements LocationListener, GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener {

private static final long INTERVAL = 1000 * 30; //30sec
private static final long FASTEST_INTERVAL = 1000 * 5; // 5sec

Activity mActivity;
public LocationRequest locationRequest;
public GoogleApiClient googleApiClient;
public Location location;
public FusedLocationProviderApi fusedLocationProviderApi = LocationServices.FusedLocationApi;

public FusedLocationService(Activity activity) {

    Timber.plant(new Timber.DebugTree());
    locationRequest = LocationRequest.create();
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    locationRequest.setInterval(INTERVAL);
    locationRequest.setFastestInterval(FASTEST_INTERVAL);
    mActivity = activity;
    googleApiClient = new GoogleApiClient.Builder(mActivity)
            .addApi(LocationServices.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();

    if (googleApiClient != null) {
        googleApiClient.connect();
    }

}

@Override
public void onConnected(Bundle connectionHint) {
    Log.e("-onConnected-", "connected now");
    location = fusedLocationProviderApi.getLastLocation(googleApiClient);
    fusedLocationProviderApi.requestLocationUpdates(googleApiClient, locationRequest, this);
}

@Override
public void onLocationChanged(Location location) {
}

public Location getLocation() {
    return location;
}

@Override
public void onConnectionSuspended(int i) {
}

@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
  }
}

我已在 gradle 文件夹中的 list 和库中包含权限。 所以请帮助。提前谢谢你

Answer 1

缺少对新位置的引用:

@Override
public void onLocationChanged(Location location) {
    this.location = location;
}

位置更新也是异步的。因此，您需要类似 Activity 的回调。

编辑:

同时检查 Google Play 服务是否可用。您可以创建这样的方法:

public boolean checkPlayServices() {
   return GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(context) == ConnectionResult.SUCCESS;
}

参见 Google documentation