服务未提供位置更新

问题描述

我正在尝试让一个应用在后台运行时提供位置更新。打开应用程序后，服务运行正常。当应用程序在后台运行时，服务将继续运行，但位置更新将停止。我曾尝试使用前台服务，但这无济于事。

我正在使用Google的fusedLocationProviderClient

public int onStartCommand(Intent intent,int flags,int startId) {
      client.requestLocationUpdates(locationRequest,locationCallback,Looper.myLooper());
}

使用在onCreate（）中定义的位置请求

locationRequest = LocationRequest.create();
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setInterval(500);
locationRequest.setFastestInterval(500);

并将回调定义为：

private final LocationCallback locationCallback = new LocationCallback() {
    @Override
    public void onLocationResult(LocationResult locationResult) {
        List<Location> locationList = locationResult.getLocations();
        if (locationList.size() != 0) {
            Location location = locationList.get(0);
            Log.e("AppLocationService","Latitude  - " +location.getLatitude()+",longitude  - " +location.getLongitude() );
        }
    }

我真的是android studio的新手，所以非常感谢您的帮助！

更新：

通过startService（）启动服务

public class BackgroundService2 extends Service {
private FusedLocationProviderClient client;
private LocationRequest locationRequest;

@Override
public void onCreate() {
    super.onCreate();
    client = LocationServices.getFusedLocationProviderClient(this);
    locationRequest = LocationRequest.create();
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    locationRequest.setInterval(500);
    locationRequest.setFastestInterval(500);
}

@Override
public int onStartCommand(Intent intent,int startId) {
    super.onStartCommand(intent,flags,startId);
    try {
        if ( Build.VERSION.SDK_INT >= 23 &&
                ContextCompat.checkSelfPermission( getBaseContext(),android.Manifest.permission.ACCESS_FINE_LOCATION ) == PackageManager.PERMISSION_GRANTED &&
                ContextCompat.checkSelfPermission( getBaseContext(),android.Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            client.requestLocationUpdates(locationRequest,Looper.myLooper());
        }

    } catch (SecurityException ignore) {
        Log.e("AppLocationService","SecurityException - " + ignore.toString(),ignore);
    }
    return START_STICKY;
}


private final LocationCallback locationCallback = new LocationCallback() {
    @Override
    public void onLocationResult(LocationResult locationResult) {
        List<Location> locationList = locationResult.getLocations();
        if (locationList.size() != 0) {
            Location location = locationList.get(0);
            Log.e("AppLocationService",longitude  - " +location.getLongitude() );
        }
    }

};


@Override
public IBinder onBind(Intent intent) {
    // Todo: Return the communication channel to the service.
    return null;
}

}

解决方法

原来是我的清单有问题。不仅必须声明服务，还必须声明其类型。

<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

以及

<service
        android:name=".BackgroundService"
        android:enabled="true"
        android:exported="true"
        android:foregroundServiceType="location" />