无法获取Android设备上的GPS位置提供商的位置 [英] Unable to get location with gps location provider on android device

问题描述

我正在开发基于小型位置的android应用程序，其中我需要用户当前的位置。我的代码看起来像是：

  private final LocationListener locationListener = new LocationListener（）{
 public void onLocationChanged（Location location）{
 updateWithNewLocation（location）; 
 
 $ b public void onProviderDisabled（String provider）{} $ b $ public void onProviderEnabled（String provider）{} $ b $ public void onStatusChanged（String provider，int status，
 Bundle extras）{} 
}; 
 
 @Override 
 public void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.main）; 
 
 LocationManager locationManager; 
 String svcName = Context.LOCATION_SERVICE; 
 locationManager =（LocationManager）getSystemService（svcName）; 
 
 Criteria criteria = new Criteria（）; 
 criteria.setAccuracy（Criteria.ACCURACY_FINE）; 
 criteria.setPowerRequirement（Criteria.POWER_LOW）; 
 criteria.setAltitudeRequired（false）; 
 criteria.setBearingRequired（false）; 
 criteria.setSpeedRequired（false）; 
 criteria.setCostAllowed（true）; 
 String provider = locationManager.getBestProvider（criteria，true）; 
 
 //位置l = locationManager.getLastKnownLocation（locationManager.NETWORK_PROVIDER）; 
位置l = locationManager.getLastKnownLocation（provider）; 
 
 updateWithNewLocation（l）; 
 
 locationManager.requestLocationUpdates（provider，2000，10，locationListener）; 
 
 
 
 $ b private void updateWithNewLocation（Location location）
 {
 TextView myLocationText; 
 myLocationText =（TextView）findViewById（R.id.myLocationText）; 
字符串latLongString =找不到位置; 
 if（location！= null）{
 double lat = location.getLatitude（）; 
 double lng = location.getLongitude（）; 
 latLongString =Lat：+ lat +\\\
Long：+ lng; 
} 
 myLocationText.setText（您当前的位置是：\ n+ 
 latLongString）; 
 
 
 $ / code> 

我的问题是，当我使用提供者作为网络时，工作正常。但是，当它选择gps作为提供者时，它会给出空值。我第一次知道它给了我空值。我也使用onLocationChanged方法，但它仍然没有给我适当的输出。
当我打开我的应用程序时，它显示我输出空值，并且它也启动gps来处理我的位置。我等待一段时间才能获得更新的位置，但它没有给我有效的输出。
我的代码有什么问题吗？
我正在使用android设备。



需要帮助...谢谢...


解决方案

更改此行

 位置l = locationManager.getLastKnownLocation（provider）; 
 locationManager.requestLocationUpdates（provider，2000，10，locationListener）; 
  

至

  Location l = locationManager.getLastKnownLocation（LocationManager.GPS_PROVIDER）; 
 locationManager.requestLocationUpdates（LocationManager.GPS_PROVIDER，2000，10，locationListener）; 
  

然后我认为它会起作用。

或者您可以按照这个教程来获取使用gps的位置

I am developing small location based android application in which I need users current location. I am also updating users current location as soon as some change in location is occurred.My code looks like:

private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
updateWithNewLocation(location);

}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status,
Bundle extras) {}
}; 

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    LocationManager locationManager;
    String svcName = Context.LOCATION_SERVICE;
    locationManager = (LocationManager)getSystemService(svcName);

    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_FINE);
    criteria.setPowerRequirement(Criteria.POWER_LOW);
    criteria.setAltitudeRequired(false);
    criteria.setBearingRequired(false);
    criteria.setSpeedRequired(false);
    criteria.setCostAllowed(true);
    String provider = locationManager.getBestProvider(criteria, true);

    //Location l = locationManager.getLastKnownLocation(locationManager.NETWORK_PROVIDER);
    Location l = locationManager.getLastKnownLocation(provider);

    updateWithNewLocation(l);

    locationManager.requestLocationUpdates(provider, 2000, 10, locationListener);

}


private void updateWithNewLocation(Location location) 
{
    TextView myLocationText;
    myLocationText = (TextView)findViewById(R.id.myLocationText);
    String latLongString = "No location found";
    if (location != null) {
    double lat = location.getLatitude();
    double lng = location.getLongitude();
    latLongString = "Lat:" + lat + "\nLong:" + lng;
    }
myLocationText.setText("Your Current Position is:\n" +
latLongString);

}

My problem is that when I use provider as network then it's working fine. But when it select gps as provider then it's giving null value. I know for the first time it gives me null value. I also used onLocationChanged method but it's still not giving me proper output. When I open my application it shows me output null value and it also start gps for serching my location. I wait for some time to get updated location but it not giving me valid output. Is there any thing wrong with my code. I am using android device.

Need Help... Thank you...

解决方案

Change this line

Location l = locationManager.getLastKnownLocation(provider); 
locationManager.requestLocationUpdates(provider, 2000, 10, locationListener);

to

Location l = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
locationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 2000, 10, locationListener);

then i think it will work.

Or you can follow this tutorial to get the location using gps

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