android - 根据可用性在 GPS 和网络提供商之间切换

Question

public void onCreate() {
 locationListener = new GeoUpdateHandler();
 locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

try {
   gps_enabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
   network_enabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
} catch (Exception ex) { 
}

if(gps_enabled) {
       locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, TIME_DURATION, 100, locationListener);
} else if(network_enabled) { // Checking for GSM
   locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, TIME_DURATION, DISTANCE, locationListener);
}   
}   
public class GeoUpdateHandler implements LocationListener {
private void getPresentLocation(Location location) {
    ... 
            //Fetch the locations
            ...
}

@Override
public void onProviderDisabled(String provider) { }

@Override
public void onProviderEnabled(String provider) { }

@Override
public void onStatusChanged(String provider, int status, Bundle extras) { }

@Override
public void onLocationChanged(Location location) {
    getPresentLocation(location);
}
}

这是我的代码 fragment ，我的问题是，一旦应用程序在 GPS 开启的情况下安装，一旦我们关闭 GPS，它就不会切换到 GSM 来获取位置，反之亦然。

所以请告诉我一种根据位置提供商的可用性在 GPS 和 GSM 之间高效切换的方法。

注意:我的应用是一项服务。

谢谢。

编辑:我有一个 BroadcastReceiver，这就是为什么我假设一旦 GPS 开启/关闭就会调用 onCreate()。

我还尝试在 onLocationChanged(Location location) 中检查提供商可用性。但这没有帮助。

编辑:我像这样修改了我的 onProviderDisabled 和 onProviderEnabled，请告诉我在这里做错了什么..

    public void onProviderDisabled(String provider) {
        locationManager.removeUpdates(locationListener);
        if (provider.toLowerCase().equals(LocationManager.GPS_PROVIDER)) {
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, TIME_DURATION, 1, locationListener);               
        } else {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, TIME_DURATION, 1, locationListener);
        }   
    }

    @Override
    public void onProviderEnabled(String provider) {
        locationManager.removeUpdates(locationListener);
        if (provider.toLowerCase().equals(LocationManager.GPS_PROVIDER)) {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, TIME_DURATION, 1, locationListener);
        } else {
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, TIME_DURATION, 1, locationListener);
        }

    }

Answer 1

有一个解决方案:

 public void onProviderDisabled(String provider) {
   locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
   if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,  locationListener);
   } else {
      locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
   } 
}

@Override
public void onProviderEnabled(String provider) {
  locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);   
  if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
  } else {
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
  }
}

我错过的是locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);在 onProviderEnabled() 和 onProviderDisabled() 中。

谢谢