位置服務無法分段運行

Question

我試圖找到一個位置，以顯示片段中三個最近的餐廳。

該位置應在加載視圖之前獲取，因為恢復劑的位置取決於該位置。

/////////////////分段///////////////////

    private double latitude;
    private double longitude;
    private LocationReceiver locationReceiver;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        final View myFragmentView = inflater.inflate(R.layout.fragment_resturants, container, false);

        DataSource dataSource = new DataSource(getContext());
        final List<Restaurant> lista = dataSource.getThreeNearRestaurants(latitude, longitude);

        TextView nombre1 = (TextView) myFragmentView.findViewById(R.id.input_nombre1);
        TextView direccion1 = (TextView) myFragmentView.findViewById(R.id.input_direccion1);
        TextView ciudad1 = (TextView) myFragmentView.findViewById(R.id.input_ciudad1);
        TextView pais1 = (TextView) myFragmentView.findViewById(R.id.input_pais1);
        nombre1.setText(lista.get(0).getName());
        direccion1.setText(lista.get(0).getAddress());
        ciudad1.setText(lista.get(0).getCity());
        switch(lista.get(0).getCountry()){
            case "France":
                pais1.setText(R.string.france);
                break;
            case "Spain":
                pais1.setText(R.string.spain);
                break;
            case "Poland":
                pais1.setText(R.string.poland);
                break;
            case "Portugal":
                pais1.setText(R.string.portugal);
        }

        TextView nombre2 = (TextView) myFragmentView.findViewById(R.id.input_nombre2);
        TextView direccion2 = (TextView) myFragmentView.findViewById(R.id.input_direccion2);
        TextView ciudad2 = (TextView) myFragmentView.findViewById(R.id.input_ciudad2);
        TextView pais2 = (TextView) myFragmentView.findViewById(R.id.input_pais2);
        nombre2.setText(lista.get(1).getName());
        direccion2.setText(lista.get(1).getAddress());
        ciudad2.setText(lista.get(1).getCity());
        switch(lista.get(1).getCountry()){
            case "France":
                pais2.setText(R.string.france);
                break;
            case "Spain":
                pais2.setText(R.string.spain);
                break;
            case "Poland":
                pais2.setText(R.string.poland);
                break;
            case "Portugal":
                pais2.setText(R.string.portugal);
        }

        TextView nombre3 = (TextView) myFragmentView.findViewById(R.id.input_nombre3);
        TextView direccion3 = (TextView) myFragmentView.findViewById(R.id.input_direccion3);
        TextView ciudad3 = (TextView) myFragmentView.findViewById(R.id.input_ciudad3);
        TextView pais3 = (TextView) myFragmentView.findViewById(R.id.input_pais3);
        nombre3.setText(lista.get(2).getName());
        direccion3.setText(lista.get(2).getAddress());
        ciudad3.setText(lista.get(2).getCity());
        switch(lista.get(2).getCountry()) {
            case "France":
                pais3.setText(R.string.france);
                break;
            case "Spain":
                pais3.setText(R.string.spain);
                break;
            case "Poland":
                pais3.setText(R.string.poland);
                break;
            case "Portugal":
                pais3.setText(R.string.portugal);
        }

        CardView cardView1 = (CardView) myFragmentView.findViewById(R.id.card_view1);

        cardView1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                localizar(lista.get(0));
            }
        });

        CardView cardView2 = (CardView) myFragmentView.findViewById(R.id.card_view2);

        cardView2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                localizar(lista.get(1));
            }
        });

        CardView cardView3 = (CardView) myFragmentView.findViewById(R.id.card_view3);

        cardView3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                localizar(lista.get(2));
            }
        });

        return myFragmentView;
    }

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

        locationReceiver = new LocationReceiver();
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(LocationService.MY_ACTION);
        getActivity().registerReceiver(locationReceiver, intentFilter);

        Intent intent = new Intent(getContext(), LocationService.class);
        getActivity().startService(intent);


    }

    private void localizar(Restaurant restaurant) {
        Uri gmmIntentUri = Uri.parse("google.navigation:q=" + restaurant.getLatitude() + "," + restaurant.getLongitude());
        Intent mapIntent = new Intent(Intent.ACTION_VIEW, gmmIntentUri);
        mapIntent.setPackage("com.google.android.apps.maps");
        startActivity(mapIntent);
    }

    private class LocationReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context arg0, Intent intent) {
            Bundle b = intent.getExtras();
            latitude = b.getDouble("latitude");
            longitude = b.getDouble("longitude");
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        getActivity().unregisterReceiver(locationReceiver);
    }

/////////////////定位服務///////////////////

public class LocationService extends Service {
    final static String MY_ACTION = "MY_ACTION";
    private LocationManager mLocationManager = null;
    private static final int LOCATION_INTERVAL = 1000;
    private static final float LOCATION_DISTANCE = 10f;
    private Location mLastLocation;

    private class LocationListener implements android.location.LocationListener {

        public LocationListener(String provider) {
            Log.e(TAG, "LocationListener " + provider);
            mLastLocation = new Location(provider);
        }

        @Override
        public void onLocationChanged(Location location) {
            Log.e(TAG, "onLocationChanged: " + location);

            mLastLocation.set(location);
        }

        @Override
        public void onProviderDisabled(String provider) {
            Log.e(TAG, "onProviderDisabled: " + provider);
        }

        @Override
        public void onProviderEnabled(String provider) {
            Log.e(TAG, "onProviderEnabled: " + provider);
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            Log.e(TAG, "onStatusChanged: " + provider);
        }
    }

    LocationListener[] mLocationListeners = new LocationListener[]{
            new LocationListener(LocationManager.GPS_PROVIDER),
            new LocationListener(LocationManager.NETWORK_PROVIDER)
    };

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.e(TAG, "onStartCommand");
        MyThread myThread = new MyThread();
        myThread.start();
        return  super.onStartCommand(intent, flags, startId);
//        return START_STICKY;
    }

    public class MyThread extends Thread {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            for (int i = 0; i < 10; i++) {
                try {
                    Thread.sleep(5000);
                    Intent intent = new Intent();
                    intent.setAction(MY_ACTION);

                    intent.putExtra("latitude", mLastLocation.getLatitude());
                    intent.putExtra("longitude", mLastLocation.getLongitude());

                    sendBroadcast(intent);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            stopSelf();
        }

    }

    @Override
    public void onCreate() {
        Log.e(TAG, "onCreate");
        initializeLocationManager();
        try {
            mLocationManager.requestLocationUpdates(
                    LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
                    mLocationListeners[1]);
        } catch (SecurityException ex) {
            Log.i(TAG, "fail to request location update, ignore", ex);
        } catch (IllegalArgumentException ex) {
            Log.d(TAG, "network provider does not exist, " + ex.getMessage());
        }
        try {
            mLocationManager.requestLocationUpdates(
                    LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
                    mLocationListeners[0]);
        } catch (SecurityException ex) {
            Log.i(TAG, "fail to request location update, ignore", ex);
        } catch (IllegalArgumentException ex) {
            Log.d(TAG, "gps provider does not exist " + ex.getMessage());
        }
    }

    @Override
    public void onDestroy() {
        Log.e(TAG, "onDestroy");
        super.onDestroy();
        if (mLocationManager != null) {
            for (LocationListener mLocationListener : mLocationListeners) {
                try {
                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                        // TODO: Consider calling
                        //    ActivityCompat#requestPermissions
                        // here to request the missing permissions, and then overriding
                        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                        //                                          int[] grantResults)
                        // to handle the case where the user grants the permission. See the documentation
                        // for ActivityCompat#requestPermissions for more details.
                        return;
                    }
                    mLocationManager.removeUpdates(mLocationListener);
                } catch (Exception ex) {
                    Log.i(TAG, "fail to remove location listners, ignore", ex);
                }
            }
        }
    }

    private void initializeLocationManager() {
        Log.e(TAG, "initializeLocationManager");
        if (mLocationManager == null) {
            mLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
        }
    }

收到的位置是0.0，因為在獲取位置之前加載了View。 我該如何解決？

提前致謝

Answer 1

您正在使用廣播，這也可以。 您只需要更新LocationReceiver.onReceive方法即可在那里更新視圖。 基本上，您說的是“嘿，位置服務，到我這里去餐館。位置服務廣播給您，說，您這些是餐館。”而且，您只存儲坐標，而不刷新視圖。 您需要考慮到此過程需要花費時間，並且您的視圖已被繪制。 接收廣播后，只需刷新所有視圖即可。 會做到的。 抱歉，現在只了解您的代碼;）