如何在棉花糖及更高版本中获取当前位置的纬度和经度？

Question

1. 首先我要检查 Internet 连接是否已连接。如果未连接，则显示对话框以启动 Internet 连接。

2. 然后我想检查 GPS 是否打开，然后获取经纬度位置，并在文本或 Toast 中显示经纬度。

3. 在我的代码中，我使用 GPS 追踪器来获取位置。

   public class GPSTracker extends Service implements LocationListener {
       private final Context mContext;
       // flag for GPS status
       boolean isGPSEnabled = false;
       // flag for network status
       boolean isNetworkEnabled = false;
       // flag for GPS status
       boolean canGetLocation = false;
       Location location; // location
       double latitude; // latitude
       double longitude; // longitude
       // The minimum distance to change Updates in meters
       private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
       // The minimum time between updates in milliseconds
       private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
       // Declaring a Location Manager
       protected LocationManager locationManager;
       public GPSTracker(Context context) {
           this.mContext = context;
           getLocation();
       }
       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;
                   // First get location from Network Provider
                   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;
       }
       /**
        * Stop using GPS listener
        * Calling this function will stop using GPS in your app
        */
       public void stopUsingGPS() {
           if (locationManager != null) {
               locationManager.removeUpdates(GPSTracker.this);
           }
       }
       /**
        * Function to get latitude
        */
       public double getLatitude() {
           if (location != null) {
               latitude = location.getLatitude();
           }
           // return latitude
           return latitude;
       }
       /**
        * Function to get longitude
        */
       public double getLongitude() {
           if (location != null) {
               longitude = location.getLongitude();
           }
           // return longitude
           return longitude;
       }
       /**
        * Function to check GPS/wifi enabled
        *
        * @return boolean
        */
       public boolean canGetLocation() {
           return this.canGetLocation;
       }
       /**
        * Function to show settings alert dialog
        * On pressing Settings button will lauch Settings Options
        */
       public void showSettingsAlert() {
           AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
           // Setting Dialog Title
           alertDialog.setTitle("GPS Setting");
           // Setting Dialog Message
           alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
           // On pressing Settings button
           alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int which) {
                   Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                   mContext.startActivity(intent);
               }
           });
           // on pressing cancel button
           alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int which) {
                   dialog.cancel();
               }
           });
           // Showing Alert Message
           alertDialog.show();
       }
       @Override
       public void onLocationChanged(Location location) {
       }
       @Override
       public void onProviderDisabled(String provider) {
       }
       @Override
       public void onProviderEnabled(String provider) {
       }
       @Override
       public void onStatusChanged(String provider, int status, Bundle extras) {
       }
       @Override
       public IBinder onBind(Intent arg0) {
           return null;
       }
   }
   

4. Main ActivityonCreate我使用下面的代码来获取纬度和经度的位置

   GPSTracker gpsTracker = new GPSTracker(this);
   if (gpsTracker.canGetLocation()) {
       CurrentLattitude = gpsTracker.getLatitude();
       CurrentLongitude = gpsTracker.getLongitude();
       Log.e(TAG, String.valueOf(CurrentLattitude));
       Log.e(TAG, String.valueOf(CurrentLongitude));
   } else {
       gpsTracker.showSettingsAlert();
   }
   

5. 在 kitkat 上运行时，我在 Logcat 中获取位置并能够看到，但是当我在棉花糖中使用相同的代码时，它会给出以下信息：

   E/latlang: 0.0
   E/latlang: 0.0
   

如何获取棉花糖中的经纬度？

Answer 1

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

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

Answer 2

检查互联网连接：

private void setMobileDataEnabled(Context context, boolean enabled) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {
    final ConnectivityManager conman = (ConnectivityManager)  context.getSystemService(Context.CONNECTIVITY_SERVICE);
    final Class conmanClass = Class.forName(conman.getClass().getName());
    final Field connectivityManagerField = conmanClass.getDeclaredField("mService");
    connectivityManagerField.setAccessible(true);
    final Object connectivityManager = connectivityManagerField.get(conman);
    final Class connectivityManagerClass =  Class.forName(connectivityManager.getClass().getName());
    final Method setMobileDataEnabledMethod = connectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
    setMobileDataEnabledMethod.setAccessible(true);

    setMobileDataEnabledMethod.invoke(connectivityManager, enabled);
}