Android位置在模拟器上为null但在设备上正常工作

Question

按下按钮后，我上课了我的位置：

import android.app.ProgressDialog;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;

public class MyLocation {
    // Timer timer1;
    LocationManager lm;
    LocationResult locationResult;
    boolean gps_enabled=false;
    boolean network_enabled=false;
    AsyncTask<Context, Void, Void> mtask;

    public boolean getLocation(Context context, LocationResult result)
    {
       // context = MyApp.getContext();
        //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;

        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(), 20000);
        mtask= new GetLastLocation().execute();
        return true;
    }

    LocationListener locationListenerGps = new LocationListener() {
        public void onLocationChanged(Location location) {
            // timer1.cancel();
            mtask.cancel(true);
            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) {
            mtask.cancel(true);
            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) {}
    };

    private Context mContext;
    public MyLocation(Context c) { this.mContext = c; }


    class GetLastLocation extends AsyncTask<Context, Void, Void>
    {

        ProgressDialog dialog = new ProgressDialog(mContext);

        protected void onPreExecute()
        {
            dialog.setMessage("Searching....");
            dialog.show();
        }

        protected Void doInBackground(Context... params)
        {
            Handler mHandler = new Handler(Looper.getMainLooper());



            // ...
            mHandler.post(new Runnable() {
                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);
                }
            });
            // ...


            return null;
        }

        protected void onPostExecute(final Void unused)
        {
            dialog.dismiss();
        }
    }





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

我这样使用它：

（在创建方法中）：

myLocation = new MyLocation(MainActivity.this);

（在点击监听器中）：

MyLocation.LocationResult locationResult = new MyLocation.LocationResult(){
                    @Override
                    public void gotLocation(final Location location){
                        for(PhoneNumberContainer object: tel){
                            Log.v("lista",object.number);

                        }
                        if(location==null){ Log.v("lista1","przejebane");}
                        else {
                            Collections.sort(tel, new CustomComparator(location));
                        }
                        for(PhoneNumberContainer object: tel){
                            Log.v("lista1",object.number);

                        }
                        Intent intent = new Intent(Intent.ACTION_CALL);
                        int res = ctx.checkCallingOrSelfPermission("android.permission.CALL_PHONE");
                        if (res == PackageManager.PERMISSION_GRANTED) {

                            intent.setData(Uri.parse("tel:" + tel.get(0).number));
                            startActivity(intent);

                        }
                    }
                };
                myLocation.getLocation(MainActivity.this, locationResult);

我的问题是当我在设备上测试代码时效果很好，但是当我在模拟器上测试它时，我会得到null而不是位置。为什么会这样？我的运气是它在设备上工作（可能会破坏另一个）还是应该在所有情况下工作？

Answer 1

某些模拟器没有gps。如果你想用模拟器开发。我建议你使用Genymotion