纬度和经度始终等于零

问题描述

我试图获取用户当前的经度,但是在实际设备上测试时纬度和经度始终等于0。这是我的GPStracker类代码:

公共类GPStracker实现了LocationListener {

Context context;

public GPStracker(Context context) {
    super();
    this.context = context;
}

public Location getLocation(){
    if (ContextCompat.checkSelfPermission( context,android.Manifest.permission.ACCESS_FINE_LOCATION ) != PackageManager.PERMISSION_GRANTED) {
        Log.e("fist","error");
        return null;
    }
    try {
        LocationManager lm = (LocationManager) context.getSystemService(LOCATION_SERVICE);
        boolean isGPSEnabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
        if (isGPSEnabled){
            lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,6000,this);
            Location loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            return loc;
        }else{
            Log.e("sec","error");
        }
    }catch (Exception e){
        e.printStackTrace();
    }
    return null;
}

这就是我在MainActivity中使用它的方式:

 ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION},123);
        GPStracker g = new GPStracker(getApplicationContext());
        Location l = g.getLocation();
        if (l != null){
            lat = l.getLatitude();
            lon = l.getLongitude();
        }

结果: 纬度= 0 lon = 0

解决方法

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