Question

我正在尝试检测用户当前位置何时在我的Android应用中更改。但是没有触发onLocationChanged。我尝试在Fragment btw中实现它。

片段：

public class Fragment_Map extends Fragment {
   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.activity_fragment__live_map, container, false);
        rootView.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (keyCode == KeyEvent.KEYCODE_BACK) {

                    return true;
                }
                return false;
            }
        });

        // The minimum time (in miliseconds) the system will wait until checking if the location changed
        int minTime = 1000;
        // The minimum distance (in meters) traveled until you will be notified
        float minDistance = 1;
        // Create a new instance of the location listener
        MyLocationListener myLocListener = new MyLocationListener();
        // Get the location manager from the system
        LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
        // Get the criteria you would like to use
        Criteria criteria = new Criteria();
        criteria.setPowerRequirement(Criteria.POWER_LOW);
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        criteria.setAltitudeRequired(false);
        criteria.setBearingRequired(false);
        criteria.setCostAllowed(true);
        criteria.setSpeedRequired(false);
        // Get the best provider from the criteria specified, and false to say it can turn the provider on if it isn't already
        String bestProvider = locationManager.getBestProvider(criteria, false);
        // Request location updates
        locationManager.requestLocationUpdates(bestProvider, minTime, minDistance, myLocListener);

        return rootView;
}

private class MyLocationListener implements LocationListener {
        @Override
        public void onLocationChanged(Location loc) {
            if (loc != null) {
                Log.d("CHECKLOCA", "fired");
                Toast.makeText(getActivity(), "fired", Toast.LENGTH_LONG).show();
            }
        }

        @Override
        public void onProviderDisabled(String arg0) {
            // Do something here if you would like to know when the provider is disabled by the user
        }

        @Override
        public void onProviderEnabled(String arg0) {
            // Do something here if you would like to know when the provider is enabled by the user
        }

        @Override
        public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
            // Do something here if you would like to know when the provider status changes
        }
    }

为什么位置没有改变听众的射击？是因为它是片段吗？在一个黑客马拉松的家伙中间，你能帮我解决这个讨厌的错误吗？

Answer 1

您可以使用GoogleApiClient请求位置并将优先级设置为PRIORITY_HIGH_ACCURACY。您可以让Fragment为callbacks实施GoogelApiClient - 然后像这样实例化和连接GoogleAPIClient：

googleApiClient = new GoogleApiClient.Builder(getActivity())
                                .addApi(LocationServices.API)
                                .addConnectionCallbacks(this)
                                .addOnConnectionFailedListener(this)
                                .build();
      googleApiClient.connect();

然后，一旦您的客户端连接到位置服务API，您就可以请求更新：

    public void onConnected(Bundle bundle){
    ...
    LocationRequest locationRequest = LocationRequest.create();
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    locationRequest.setInterval(180000); // update interval - eg (3) minutes 
                LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, myLocListener);

    ...

}

我希望这会有所帮助。

Answer 2

像这样创建界面：

public interface OnLocationReceived 
{
 public void onLocationReceived(LatLng latlong);
 public void onLocationReceived(Location location);
 public void onConntected(Bundle bundle);
 public void onConntected(Location location);
}

2.将其放在MyLocationListener

中

@Override
 public void onLocationChanged(Location location) 
{
  if (!isLocationReceived) {
    mLocationReceived.onConntected(location);
    isLocationReceived = true;
   }
   if (mLocationReceived != null) {
    mLocationReceived.onLocationReceived(location);
   }
   latLong = getLatLng(location);
   if (mLocationReceived != null && latLong != null) {
    mLocationReceived.onLocationReceived(latLong);
   }
}

Answer 3

也许您的设备无法提供您设置的标准以查找位置。可以在onCreateView（）中使用此代码：

sqrt

Android位置侦听器未触发

3 个答案: