2017-10-18 97 views
0

我正在使用Nexus 6p和Android 7.1.2。我将设备位置精确度设置为HIGH_ACCURACY。 在我的代码中,我有一个使用FusedLocation API的位置更新后台服务。如您所见,我还将位置请求优先级设置为HIGH_ACCURACY。 现在我已经测试了它,当设备在我的桌面上时没有任何移动,并且大部分时间我都有相同的LAT/LONG值,有时我看到LAT/LONG值有轻微变化,即使设备没有动。 因此,我使用getAccuracy方法打印了位置精度。 该文档说,如果getAccuracy方法返回值> = 68,这意味着设备(用户)位于此位置的可能性很高。 所以我尝试使用这种方法(下面的代码的另一个版本),并检查getAccuracy返回值> = 68,然后打印位置的详细信息。 猜猜看是什么?它并没有太多的帮助..错误位置纬度/经度

我试着下一件事是旋转设备,我看到,当设备在landsacpe模式与回到我的位置拉特/长变(即使我没有去任何地方),准确度明显增加,在某些情况下达到的180

值所以我不明白这一点:

为什么有时设备的纬度/长值是不同的,甚至虽然设备躺在桌子上,不动?

旋转如何影响位置精度?!

我的代码:

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

    private GoogleApiClient googleApiClient; 
    private LocationRequest locationRequest; 

    private boolean playsServiceAvailable; 

    private String TAG = getClass().getSimpleName(); 

    @Override 
    public void onCreate() 
    { 
     Log.d(TAG,"onCreate"); 
     super.onCreate(); 

     initRequestLocation(); 

     playsServiceAvailable = checkPlayServicesConnection(); 

     setupLocationApiClient(); 
    } 

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

    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) 
    { 
     Log.d(TAG, "onStartCommand"); 
     super.onStartCommand(intent,flags,startId); 

     if (!playsServiceAvailable || googleApiClient.isConnected())    
     { 

      return START_STICKY; 
     } 

     setupLocationApiClient(); 

     if (!googleApiClient.isConnected() || !googleApiClient.isConnecting()) 
     { 
      Log.d(TAG, "onStartCommand: googleApiclient.connect()"); 
      googleApiClient.connect(); 
     } 

     return START_STICKY; 
    } 

    @Override 
    public void onDestroy() 
    { 
     Log.d(TAG, "onDestroy"); 

     if (this.playsServiceAvailable && this.googleApiClient != null) 
     { 
      this.googleApiClient.unregisterConnectionCallbacks(this); 
      this.googleApiClient.unregisterConnectionFailedListener(this); 
      this.googleApiClient.disconnect(); 
      this.googleApiClient = null; 
     } 

     super.onDestroy(); 
    } 

    @Override 
    public void onConnected(@Nullable Bundle bundle) 
    { 
     try 
     { 
      LocationServices.FusedLocationApi.requestLocationUpdates(this.googleApiClient, locationRequest, this); 
     } 
     catch (SecurityException e) 
     { 
      e.printStackTrace(); 
     } 
    } 

    @Override 
    public void onConnectionSuspended(int i) 
    { 
     googleApiClient = null; 
    } 

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

    @Override 
    public void onLocationChanged(Location currentLocation) 
    { 
     Log.d(TAG, "onLocationChanged:\n\t\t\t" + 
       "CurrentLocation:\n\t\t\t\t" + 
       "ACCURACY: " + currentLocation.getAccuracy() + "\n\t\t\t\t" + 
       "LAT: " + currentLocation.getLatitude() + "\n\t\t\t\t" + 
       "LONG: " + currentLocation.getLongitude() + "\n\t\t\t\t" + 
       "TIME: " + currentLocation.getTime()); 

    } 

    private boolean checkPlayServicesConnection() 
    { 
     int resultCode = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(context); 

     if (resultCode != ConnectionResult.SUCCESS) 
     { 
      return false; 
     } 
     return true; 
    } 

    private void initRequestLocation() 
    { 
     locationRequest = LocationRequest.create(); 
     locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY) 
       .setInterval(5000) 
       .setFastestInterval(1000); 
    } 

    private void setupLocationApiClient() 
    { 
     Log.d(TAG,"setupLocationApiClient"); 
     if (googleApiClient == null) 
      initGoogleApiClient(); 
    } 

    private synchronized void initGoogleApiClient() 
    { 
     Log.d(TAG,"initGoogleApiClient"); 
     googleApiClient = new GoogleApiClient.Builder(this) 
       .addApi(LocationServices.API) 
       .addOnConnectionFailedListener(this) 
       .addConnectionCallbacks(this) 
       .build(); 
    } 
} 

回答

3

这是GPS在精度这不是设备的问题。它试图获取确切的位置,所以这就是为什么它在这里和那里试图提高GPS精度。尝试设置最小位移和间隔以获得更准确的结果。

mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); 
mLocationRequest.setSmallestDisplacement(27);//27 meter 
mLocationRequest.setInterval(5000); // Update location every 5 seconds 
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, 
mLocationRequest, this); 
+0

谢谢我会试试 – Elior

+0

我也为你编辑答案。 –

+0

好吧..它似乎工作.. 所以,如果我得到它的权利.. setSmallestDisplacement只会导致位置更新,如果有差异27米(在你的例子中) – Elior