Question

我创建了一个GPS跟踪应用程序。

不幸的是，应用程序没有显示实际位置（纬度，长度）。它始终显示lat：50.059644 long：19.9206669。但我想得到并显示用户（我）的实际位置。

这是我的主要活动：

Button btnShowLocation;
GPSTracker gps;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_about);

    btnShowLocation = (Button) findViewById(R.id.btn1);
    btnShowLocation.setOnClickListener(new View.OnClickListener() {

        public void onClick(View arg0) {        
            gps = new GPSTracker(About.this);

            if(gps.canGetLocation()){                   
                double latitude = gps.getLatitude();
                double longitude = gps.getLongitude();
                Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();    
            }else{

                gps.showSettingsAlert();
            }

        }
    });
}

这是我的GPS追踪器：

public class GPSTracker extends Service implements LocationListener{
     private final Context mContext;

        boolean isGPSEnabled = false;                
        boolean canGetLocation = false;      
        Location location;

        private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters                   
        private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute                 
        protected LocationManager locationManager;

        public GPSTracker(Context context) {
            this.mContext = context;
            getLocation();
        }

    public Location getLocation() {
        try{
            locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);            
            isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);


            if(!isGPSEnabled) {
                System.out.println("disabled");
                //no network provider is enabled
            } else {
                this.canGetLocation = true;

                if(isGPSEnabled){
                    System.out.println("gps wlaczony");
                    if (location == null){
                        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if(locationManager != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
            }
        } catch(Exception e){
            e.printStackTrace();
        }
        return location;
    }

Answer 1

您在此处请求位置更新：

locationManager.requestLocationUpdates

但不要等待更新到来。
您必须注册您的请求并为onLocationChanged方法提供监听器。当您拥有新位置时，将调用该方法。
除此之外，为了使过程正常工作，每次点击Btn时都无法初始化GPSTracker。做一次并等待更新。
试试这个：

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_about);

    btnShowLocation = (Button) findViewById(R.id.btn1);
    btnShowLocation.setOnClickListener(new View.OnClickListener() {

        public void onClick(View arg0) {        
            gps = new GPSTracker(About.this);
        }
    });
}

public class GPSTracker extends Service implements LocationListener{
    private final Context mContext;
    boolean isGPSEnabled = false;                
    boolean canGetLocation = false;      
    Location location;

    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters                   
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute                 
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);            
        isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);


        if(!isGPSEnabled) {
            System.out.println("disabled");
            //no network provider is enabled
        } else {
            this.canGetLocation = true;

            if(isGPSEnabled){
                System.out.println("gps wlaczony");
                if (location == null){
                    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("GPS Enabled", "GPS Enabled");
                    if(locationManager != null) {
                        latitude = location.getLatitude();
                        longitude = location.getLongitude();
                    }
                }
            }
        }
    }

    @Override
    public void onLocationChanged(Location location) {
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show()

    }
}

没有在android中的locationManager中显示实际位置

1 个答案: