如何獲得當前的GPS位置而無需等待Android上的位置更改？

Question

我想使用gps提供程序獲取設備的當前位置，但實際上等待gps位置發生變化。

所以我有一個簡單的應用程序偵聽的位置變化。這適用於NETWORK_PROVIDER立即，但GPS_PROVIDER我等了15分鐘，並沒有發生任何行動。

我使用API​​級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(); 
     } 
    } 
} 

我沒有把清單中的權限，所以這不是問題。

Answer 1

你測試裏面？除非您身處室外，否則您可能根本無法獲得GPS鎖，這將意味着手機會盡可能頻繁地鎖定鎖（因爲您已在requestLocationUpdates調用中爲最小時間和距離指定了0和0） ）。

不幸的是，你只需要等待設備獲得GPS鎖定，如果確實如此，由於缺乏信號的不，你只要繼續等待。您可以做的第一件事是減輕這個負擔，即嘗試獲取GPS提供商的最後一個已知位置。這將返回一個位置，如果該設備最近有一個GPS鎖和存儲位置：

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

除此之外，你應該嘗試從網絡供應商的位置，因爲這很可能會回到一個位置就像你已經觀察到的那樣，它比GPS更快。這是因爲大量的位置數據源（手機信號塔和WIFI），無論何時都可以使用，包括室內，只要您有無線信號。

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); 

    }