熔合位置Api setSmallestDisplacement忽略/不工作

Question

我正在尝试创建一个服务，该服务将在每x秒和y距离后接收位置更新。我在x秒后收到更新，但在y距离后从未收到更新。我已经用不同的值多次测试过它，似乎setSmallestDisplace根本不起作用。关于这个问题有各种各样的帖子，但没有任何解决方案。如果有人能帮助我，甚至给我指出一个不同的方向，我将不胜感激。

我的服务

public class GPS_Service extends Service implements GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener, LocationListener {

private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private int timethresh;
private int distancethresh;
protected Location mCurrentLocation;

@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onCreate() {
    super.onCreate();

    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addApi(LocationServices.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
    mGoogleApiClient.connect();

}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    mLocationRequest = new LocationRequest();
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    //Set the desired interval for active location updates, in milliseconds.
    mLocationRequest.setInterval(60* 1000);
    //Explicitly set the fastest interval for location updates, in milliseconds.
    mLocationRequest.setFastestInterval(30* 1000);
    //Set the minimum displacement between location updates in meters
    mLocationRequest.setSmallestDisplacement(1); // float


    return super.onStartCommand(intent, flags, startId);

}

@Override
public void onConnected(Bundle bundle) {
    if (mCurrentLocation == null) {
        mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

    }
     //Requests location updates from the FusedLocationApi.      
    startLocationUpdates();

}

@Override
public void onLocationChanged(Location location) {
    mCurrentLocation = location;
    //Toast.makeText(this, ""+mCurrentLocation.getLatitude()+","+mCurrentLocation.getLongitude(), Toast.LENGTH_SHORT).show();
    System.out.println(""+mCurrentLocation.getLatitude()+","+mCurrentLocation.getLongitude());


}

@Override
public void onConnectionSuspended(int i) {
    // The connection to Google Play services was lost for some reason. We call connect() to
    // attempt to re-establish the connection.
    mGoogleApiClient.connect();
}


@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
    Toast.makeText(getApplicationContext(),"Location services connection failed with code " + connectionResult.getErrorCode(), Toast.LENGTH_LONG).show();

}

protected void startLocationUpdates() {
    LocationServices.FusedLocationApi.requestLocationUpdates(
            mGoogleApiClient, mLocationRequest, this);

}

}

Answer 1

试试这样的东西：

protected void createLocationRequest() {
    mLocationRequest = new LocationRequest();

    mLocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);

    mLocationRequest.setFastestInterval(FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS);

    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

    mLocationRequest.setSmallestDisplacement(100); //100 meters
}

Answer 2

根据这个SO问题特别是cgr的回答。

如果设备处于静止状态，则为LocationRequest设置的位移就不可能获得位置，因为位移在间隔（interval）和快速间隔（fastestInterval）内进行。正如我所猜测的，可能您已经向LocationServices传递了不同的LocationRequest对象（没有置换集）。FusedLocationApi。requestLocationUpdates（）。

LocationRequest setSmallestDisplace（浮点小位移计）

设置位置更新之间的最小位移，单位为米。默认情况下，该值为0。它返回相同的对象，以便可以链接setter。

注意：来自ACCESS_COARSE_LOCATION且不ACCESS_FINE_LOCATION的应用程序的位置请求将自动限制为较慢的间隔，并且位置对象将被混淆以仅显示粗略的准确性级别。

有关详细信息，请查看此页。