如何获得当前的GPS位置而无需等待Android上的位置更改？

Question

我想使用gps提供程序获取设备的当前位置，但实际上等待gps位置发生变化。

所以我有一个简单的应用程序侦听的位置变化。这适用于NETWORK_PROVIDER立即，但GPS_PROVIDER我等了15分钟，并没有发生任何行动。

我使用API​​级8

public class MainActivity extends Activity { 
    TextView tv; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     tv = (TextView) this.findViewById(R.id.textView1); 
     LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
     LocationListener ll = new mylocationlistener(); 

     //lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, ll); // this works fine 
     lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll); 
    } 

    private class mylocationlistener implements LocationListener { 
     public void onLocationChanged(Location location) { 
      Date today = new Date(); 
      Timestamp currentTimeStamp = new Timestamp(today.getTime()); 
      if (location != null) { 
       Log.d("LOCATION CHANGED", location.getLatitude() + ""); 
       Log.d("LOCATION CHANGED", location.getLongitude() + ""); 
       String str = "\n CurrentLocation: " + "\n Latitude: " 
         + location.getLatitude() + "\n Longitude: " 
         + location.getLongitude() + "\n Accuracy: " 
         + location.getAccuracy() + "\n CurrentTimeStamp " 
         + currentTimeStamp + "\n Altitude: " 
         + location.getAltitude() + "\n Bearing" 
         + location.getBearing() + "\n Speed" 
         + location.getSpeed() + "\n "; 
       Toast.makeText(MainActivity.this, str, Toast.LENGTH_LONG) 
         .show(); 
       tv.append(str); 
      } 
     } 

     public void onProviderDisabled(String provider) { 
      Toast.makeText(MainActivity.this, "Error onProviderDisabled", 
        Toast.LENGTH_LONG).show(); 
     } 

     public void onProviderEnabled(String provider) { 
      Toast.makeText(MainActivity.this, "onProviderEnabled", 
        Toast.LENGTH_LONG).show(); 
     } 

     public void onStatusChanged(String provider, int status, Bundle extras) { 
      Toast.makeText(MainActivity.this, "onStatusChanged", 
        Toast.LENGTH_LONG).show(); 
     } 
    } 
} 

我没有把清单中的权限，所以这不是问题。

Answer 1

你测试里面？除非您身处室外，否则您可能根本无法获得GPS锁，这将意味着手机会尽可能频繁地锁定锁（因为您已在requestLocationUpdates调用中为最小时间和距离指定了0和0） ）。

不幸的是，你只需要等待设备获得GPS锁定，如果确实如此，由于缺乏信号的不，你只要继续等待。您可以做的第一件事是减轻这个负担，即尝试获取GPS提供商的最后一个已知位置。这将返回一个位置，如果该设备最近有一个GPS锁和存储位置：

Location lastLocation = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER); 

除此之外，你应该尝试从网络供应商的位置，因为这很可能会回到一个位置就像你已经观察到的那样，它比GPS更快。这是因为大量的位置数据源（手机信号塔和WIFI），无论何时都可以使用，包括室内，只要您有无线信号。

Answer 2

try{ 
       LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 


       //Location location = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER); 
       Location location = manager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 

       double longitude = location.getLongitude(); 
       double latitude = location.getLatitude(); 
       String stlongitude = Double.toString(longitude); 
       String stlatitude = Double.toString(latitude); 

       TextView celllocation = (TextView) findViewById(R.id.txtCellLocation); 
       celllocation.setText(stlatitude + " , " + stlongitude); 


       //String uri = String.format(Locale.ENGLISH, "geo:%f,%f", latitude, longitude); 
       //Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri)); 
       //startActivity(intent); 
    } 

    catch (Exception a) { 
     LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
     Location location = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER); 

     double longitude = location.getLongitude(); 
     double latitude = location.getLatitude(); 
     String stlongitude = Double.toString(longitude); 
     String stlatitude = Double.toString(latitude); 

     TextView celllocation = (TextView) findViewById(R.id.txtCellLocation); 
     celllocation.setText(stlatitude + " , " + stlongitude); 

    }