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);
}
}

这是我的代码片段,我的问题是,一旦应用程序安装了GPS Switched ON,那么一旦我们关闭GPS,它就不会切换到GSM获取位置,反之亦然.

所以请告诉我根据位置提供商的可用性在GPS和GSM之间有效切换的方法.

注意:我的应用程序是一项服务.

谢谢.

编辑:我有一个BroadcastReceiver,这就是为什么我认为一旦GPS ON/OFF发生就会调用onCreate().

我还尝试在onLocationChanged(位置位置)检查提供程序可用性.但它没有帮助.

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

    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