如何同时使用 GPS 和网络提供商在 Android 中获取当前位置的纬度和经度值

【问题标题】：How to use both GPS and Network Provider to get current location Latitude and Longitude values in Android如何同时使用 GPS 和网络提供商在 Android 中获取当前位置的纬度和经度值
【发布时间】：2012-04-24 17:27:14
【问题描述】：

在我的 Android 应用程序中，我想使用 GPS 提供程序和网络提供程序进行 5 秒的位置更新。首先，我想使用 GPS 提供者（因为它给出了准确的结果），如果 GPS 提供者返回纬度和经度为 0.0 和 0.0，那么我想使用网络提供者，但我不想同时使用这两个提供者同时地。有什么建议吗？

【问题讨论】：

    标签： android networking gps location-provider


    【解决方案1】： 
    package loca.loca;

import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;


public class LocationActivity extends Activity {

    double x,y;

    Timer timer;
    LocationManager lm;
    boolean gps_enabled = false;
    boolean network_enabled = false;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


            lm = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);



            gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
            network_enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);



        if (!gps_enabled && !network_enabled) {  Context context = getApplicationContext();
            int duration = Toast.LENGTH_SHORT;
            Toast toast = Toast.makeText(context, "nothing is enabled", duration);
            toast.show();

        }




        if (gps_enabled)
            lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
                    locationListenerGps);
        if (network_enabled)
            lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,
                    locationListenerNetwork);
         timer=new Timer();
         timer.schedule(new GetLastLocation(), 20000);

    }

    LocationListener locationListenerGps = new LocationListener() {
        public void onLocationChanged(Location location) {
            timer.cancel();
            x =location.getLatitude();
            y = location.getLongitude();
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerNetwork);

            Context context = getApplicationContext();
            int duration = Toast.LENGTH_SHORT;
            Toast toast = Toast.makeText(context, "gps enabled "+x + "\n" + y, duration);
            toast.show();
        }

        public void onProviderDisabled(String provider) {
        }

        public void onProviderEnabled(String provider) {
        }

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

    LocationListener locationListenerNetwork = new LocationListener() {
        public void onLocationChanged(Location location) {
            timer.cancel();
            x = location.getLatitude();
            y = location.getLongitude();
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerGps);

            Context context = getApplicationContext();
            int duration = Toast.LENGTH_SHORT;
            Toast toast = Toast.makeText(context, "network enabled"+x + "\n" + y, duration);
            toast.show();
        }

        public void onProviderDisabled(String provider) {
        }

        public void onProviderEnabled(String provider) {
        }

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

    class GetLastLocation extends TimerTask {
        @Override
        public void run() {
             lm.removeUpdates(locationListenerGps);
             lm.removeUpdates(locationListenerNetwork);

             Location net_loc=null, gps_loc=null;
             if(gps_enabled)
                 gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
             if(network_enabled)
                 net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

             //if there are both values use the latest one
             if(gps_loc!=null && net_loc!=null){
                 if(gps_loc.getTime()>net_loc.getTime())
                {x = gps_loc.getLatitude();
                y = gps_loc.getLongitude();
                  Context context = getApplicationContext();
                    int duration = Toast.LENGTH_SHORT;
                    Toast toast = Toast.makeText(context, "gps lastknown "+x + "\n" + y, duration);
                    toast.show();
                }
                 else
                {x = net_loc.getLatitude();
                y = net_loc.getLongitude();
                Context context = getApplicationContext();
                int duration = Toast.LENGTH_SHORT;
                Toast toast = Toast.makeText(context, "network lastknown "+x + "\n" + y, duration);
                toast.show();

                }

             }

             if(gps_loc!=null){
                  {x = gps_loc.getLatitude();
                y = gps_loc.getLongitude();
                  Context context = getApplicationContext();
                    int duration = Toast.LENGTH_SHORT;
                    Toast toast = Toast.makeText(context, "gps lastknown "+x + "\n" + y, duration);
                    toast.show();
                  }

             }
             if(net_loc!=null){
                {x = net_loc.getLatitude();
                y = net_loc.getLongitude();
              Context context = getApplicationContext();
              int duration = Toast.LENGTH_SHORT;
              Toast toast = Toast.makeText(context, "network lastknown "+x + "\n" + y, duration);
                toast.show();

                }
             }
            Context context = getApplicationContext();
            int duration = Toast.LENGTH_SHORT;
            Toast toast = Toast.makeText(context, "no last know avilable", duration);
            toast.show();

}
}}

    【讨论】：

    • 您有什么理由为两者使用不同的 LocationListener 吗？我可以只使用一个，然后检查 onLocationChange() 它正在使用哪个提供商吗？
    • 应该为每个位置提供者使用不同的 LocationListener 对象。否则将使用最后分配的提供者。
    【解决方案2】： 
      public class MyLocation {
    Timer timer1;
    LocationManager lm;
    LocationResult locationResult;
    boolean gps_enabled=false;
    boolean network_enabled=false;`

    public boolean getLocation(Context context, LocationResult result)
    {
        //I use LocationResult callback class to pass location value from MyLocation to user code.
        locationResult=result;
        if(lm==null)
            lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

        //exceptions will be thrown if provider is not permitted.
        try{gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){}
        try{network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){}

        //don't start listeners if no provider is enabled
        if(!gps_enabled && !network_enabled)
            return false;
        try{
            if(gps_enabled)
                lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
            if(network_enabled)
                lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
            timer1=new Timer();
            timer1.schedule(new GetLastLocation(), 30000);
        }catch(Exception x){
            return false;
        }
        return true;
    }

    LocationListener locationListenerGps = new LocationListener() {
        public void onLocationChanged(Location location) {
            timer1.cancel();
            locationResult.gotLocation(location);
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerNetwork);
        }
        public void onProviderDisabled(String provider) {}
        public void onProviderEnabled(String provider) {}
        public void onStatusChanged(String provider, int status, Bundle extras) {}
    };

    LocationListener locationListenerNetwork = new LocationListener() {
        public void onLocationChanged(Location location) {
            timer1.cancel();
            locationResult.gotLocation(location);
            lm.removeUpdates(this);
            lm.removeUpdates(locationListenerGps);
        }
        public void onProviderDisabled(String provider) {}
        public void onProviderEnabled(String provider) {}
        public void onStatusChanged(String provider, int status, Bundle extras) {}
    };

    class GetLastLocation extends TimerTask {
        @Override
        public void run() {
            lm.removeUpdates(locationListenerGps);
            lm.removeUpdates(locationListenerNetwork);

            Location net_loc=null, gps_loc=null;
            if(gps_enabled)
                gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            if(network_enabled)
                net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

            //if there are both values use the latest one
            if(gps_loc!=null && net_loc!=null){
                if(gps_loc.getTime()>net_loc.getTime())
                    locationResult.gotLocation(gps_loc);
                else
                    locationResult.gotLocation(net_loc);
                return;
            }

            if(gps_loc!=null){
                locationResult.gotLocation(gps_loc);
                return;
            }
            if(net_loc!=null){
                locationResult.gotLocation(net_loc);
                return;
            }
            locationResult.gotLocation(null);
        }
    }

    public static abstract class LocationResult{
        public abstract void gotLocation(Location location);
    }
}

    然后在您的活动中使用这些：

    final MyLocation myLocation = new MyLocation();

                Handler mHandler = new Handler(Looper.getMainLooper());
                mHandler.post(new Runnable() {
                    public void run() {
                        locationResult = new LocationResult(){
                            @Override
                            public void gotLocation(final Location location){
                                //Got the location!
                                try{
                                    Methods.savePre(context, ""+location.getLatitude(), "LATITUDE");
                                    Methods.savePre(context, ""+location.getLongitude(), "LONGITUDE");
                                }catch(Exception x){
                                    x.getMessage();
                                }
                                Got_loc= true;
                                //                              String geoAddress  = "geo:" + location.getLatitude() + ","+ location.getLongitude() + "?z=15";
                                //                              Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(geoAddress));
                                //                              context.startActivity(intent);
                            }
                        };
                        myLocation.getLocation(context, locationResult);
                    }
                });
                while(!Got_loc){
                    Thread.sleep(150);
                }

                Loc = Methods.getPref(context, "LATITUDE") + "%%" + Methods.getPref

    【讨论】：

      【解决方案3】：

      最简单的方法是为 gps 和网络创建两个不同的LocationListener 和两个请求位置。

      【讨论】：

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