java - Android - 实时位置共享

Question

我想开发一个应用程序，通过它我们可以与使用同一应用程序的其他用户共享我们的实时位置。我设计了 GUI，在每个 friend 面前显示了 friend 列表和分享按钮。当我们单击共享按钮时，我们的位置将与该 friend 的设备共享。这个项目是否需要数据库或者是否有任何谷歌服务可以更轻松地做到这一点？我只需要有关该项目的指导。谢谢。

Answer 1

这是您的解决方案:

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();
}
}}