Question

我有用户报告我的GPS并不是最准确的。我想知道somone是否可以仔细查看我的代码并让我知道我是否遗漏了一些东西：

public class FindBrewery extends Fragment implements LocationListener, GetNearbyBreweries.OnArticleSelectedListener {

    private TextView latituteField;
    private TextView longitudeField;
    LocationManager locationManager;
    private String provider;


    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        Context c = getActivity().getApplicationContext();
        locationManager =(LocationManager)activity.getSystemService(Context.LOCATION_SERVICE);

    }



    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        //todo change view
        View rootView = inflater.inflate(R.layout.beer_location_list,container, false);

        // Get the location manager
        // Define the criteria how to select the locatioin provider -> use
        // default
        Criteria criteria = new Criteria();
        provider = locationManager.getBestProvider(criteria, false);
        Location location = locationManager.getLastKnownLocation(provider);

        // Initialize the location fields
        if (location != null) {
            System.out.println("Provider " + provider + " has been selected.");
            onLocationChanged(location);
        } else {

        }


        return rootView;
    }




    /* Request updates at startup */
    @Override
    public void onResume() {
        super.onResume();
        locationManager.requestLocationUpdates(provider, 400, 1, this);
    }

    /* Remove the locationlistener updates when Activity is paused */
    @Override
    public void onPause() {
        super.onPause();
        locationManager.removeUpdates(this);
    }

    @Override
    public void onLocationChanged(Location location) {
        int lat = (int) (location.getLatitude());
        int lng = (int) (location.getLongitude());
        //latituteField.setText(String.valueOf(lat));
        //longitudeField.setText(String.valueOf(lng));

        //Toast.makeText(this, "Finding your loaction",Toast.LENGTH_SHORT).show();

        //call asycn task for location
        String url = "myURLWithLatAndLng";

        Log.d("urlTest", url);

        //async task goes here
        new GetNearbyBreweries(this.getActivity()).execute(url);

        locationManager.removeUpdates(this);

        //todo: get json
        GetNearbyBreweries task = new GetNearbyBreweries(getActivity());
        task.setOnArticleSelectedListener(this);
        task.execute(url);



    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String provider) {
        //Toast.makeText(this, "Enabled new provider " + provider,Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onProviderDisabled(String provider) {
        //Toast.makeText(this, "Disabled provider " + provider,Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onArticleSelected(String b){

        //code to execute on click
        Fragment Fragment_one;
        FragmentManager man= getFragmentManager();
        FragmentTransaction tran = man.beginTransaction();

        Fragment_one = new BreweryTabs();
        final Bundle bundle = new Bundle();
        bundle.putString("breweryIDSent", b);
        Fragment_one.setArguments(bundle);
        tran.replace(R.id.main, Fragment_one);//tran.
        tran.addToBackStack(null);
        tran.commit();

    }



}

Answer 1

您正在使用getLastKnownLocation。这将为您提供它拥有的最后一个位置（如果有的话），这可能不是最新的。相反，您应该使用requestLocationUpdates或requestSingleUpdate来获取当前位置。此外，您正在使用未初始化的Criteria for provider。这可能会让你获得GPS或网络提供商。如果您需要GPS，请明确请求。

Answer 2

在应用程序标记之前在清单中添加这些行...它们可能有所帮助..

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<application
  -----

 </application>

报告我的GPS的用户在Android应用中不准确

2 个答案: