我們如何在不打開GPS的情況下獲取android中的位置

Question

我們如何在不打開GPS的情況下在android中檢索位置。 我能夠使用GPS，NETWORK Providers獲取位置。 禁用GPS后，無法獲取坐標。 誰能幫我。 提前致謝

Answer 1

閱讀本教程。 http://www.vogella.com/tutorials/AndroidLocationAPI/article.html

這是您可以用來從默認位置提供者檢索位置的示例代碼。

public class ShowLocation extends Activity implements LocationListener {
  private LocationManager locationManager;
  private String provider;


/** Called when the activity is first created. */

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

    // Get the location manager
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    // Define the criteria how to select the locatioin provider -> use
    // default
    Criteria criteria = new Criteria();
    provider = locationManager.getBestProvider(criteria, true);
    Location location = locationManager.getLastKnownLocation(provider);

    // Initialize the location fields
    if (location != null) {
      System.out.println("Provider " + provider + " has been selected.");
      onLocationChanged(location);
    }
  }

  /* Request updates at startup */
  @Override
  protected void onResume() {
    super.onResume();
    locationManager.requestLocationUpdates(provider, 400, 1, this);
  }

  /* Remove the locationlistener updates when Activity is paused */
  @Override
  protected void onPause() {
    super.onPause();
    locationManager.removeUpdates(this);
  }

  @Override
  public void onLocationChanged(Location location) {
    double lat = (double) (location.getLatitude());
    double lng = (double) (location.getLongitude());
  }

  @Override
  public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

  }

  @Override
  public void onProviderEnabled(String provider) {
    Toast.makeText(this, "Enabled new provider " + provider,
        Toast.LENGTH_SHORT).show();

  }

  @Override
  public void onProviderDisabled(String provider) {
    Toast.makeText(this, "Disabled provider " + provider,
        Toast.LENGTH_SHORT).show();
  }
} 

在您的AndroidManifest.xml文件中向您的應用程序添加以下權限

• 互聯網
• ACCESS_FINE_LOCATION
• ACCESS_COARSE_LOCATION

我希望這有幫助。

Answer 2

用於檢索當前位置。

public Location getLocation() {
    try {
        locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);

        // getting GPS status
        isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

        // getting network status
        isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        if (!isGPSEnabled && !isNetworkEnabled) {
            // no network provider is enabled
        } else {
            this.canGetLocation = true;
            if (isNetworkEnabled) {
                locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                Log.d("Network", "Network");
                if (locationManager != null) {
                    location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                    if (location != null) {
                        latitude = location.getLatitude();
                        longitude = location.getLongitude();
                    }
                }
            }
            // if GPS Enabled get lat/long using GPS Services
            if (isGPSEnabled) {
                if (location == null) {
                    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("GPS Enabled", "GPS Enabled");
                    if (locationManager != null) {
                        location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
            }
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
    return location;
}

所有位置API方法都需要ACCESS_COARSE_LOCATION或ACCESS_FINE_LOCATION權限。 如果您的應用程序僅具有粗略許可，則將無法訪問GPS或被動位置提供程序。 其他提供商仍將返回位置結果，

Answer 3

使用網絡提供商獲取位置：

boolean network_enabled = isNetworkAvailable();
Location location = null;
LocationManager locManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

if(network_enabled)
location = SLOC_locManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

isNetworkAvailabel（）函數：

private boolean isNetworkAvailable() {

    ConnectivityManager connectivityManager = (ConnectivityManager) SLOC_context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
    return activeNetworkInfo != null && activeNetworkInfo.isConnected();

}