如何使用按钮单击停止 onLocationChanged() 方法？

Question

我是初学者 android development.I 使用 Gps 服务实现 LocationListener.I 想停止使用按钮单击的 onLocationChanged() 方法。我尝试这样做，将空值分配给 locationManager 变量，但它不起作用。

public class TabFragment1 extends Fragment implements LocationListener {
    ImageButton btnRUN;
    ImageButton btnSTOP;
    private LocationManager locationManager;
    Context ctx;
    private double lat_new, lon_new = 0.0;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        ctx = container.getContext();
        View view = inflater.inflate(R.layout.tab_fragment_1, container, false);

        initializeApp(view);
        return view;
    }


    private void initializeApp(View view) {
        btnRUN = (ImageButton) view.findViewById(R.id.btnRun);
        btnSTOP= (ImageButton) view.findViewById(R.id.btnStop);


        btnRUN.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                runOnClick();
            }
        });

        btnSTOP.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                stopOnClick();

            }
        });

    }
    public void stopOnClick(){
          locationManager =null;
    }

    public void runOnClick() {



        locationManager = (LocationManager) ctx.getSystemService(Context.LOCATION_SERVICE);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 10, this);


    }


    @Override
    public void onLocationChanged(Location location) {
        lat_new=location.getLatitude();
        lon_new=location.getLongitude();



        String str="Lat :"+lat_new +"Lon :"+lon_new;
        Toast.makeText(ctx,str,Toast.LENGTH_LONG).show();
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {
        Toast.makeText(ctx, "Gps turned on ", Toast.LENGTH_LONG).show();
    }

    @Override
    public void onProviderDisabled(String provider) {
        Toast.makeText(ctx, "Gps turned off ", Toast.LENGTH_LONG).show();
    }


}

Answer 1

mlocManager.removeUpdates(mlocListener);

Answer 2

 public void stopOnClick(){
        locationManager.removeUpdates(this);
    }

应该可以工作，因为您的 LocationListener 是由 Fragment 实现的

注意：不要忘记在片段的 onPause 中取消注册位置侦听器，以避免当服务尝试在 'onLocationChanged' 上查找 TabFragment1 时发生崩溃（想象一下用户在您的应用程序的另一个 fragment/activity 上导航而不按'stopOnClick' 按钮):

    @Override
    public void onPause() {
        locationManager.removeUpdates(this);
        super.onPause();
    }

如何使用按钮单击停止 onLocationChanged() 方法？

How can stop onLocationChanged() method using button click?

gps

android

locationlistener