如何在应用启动期间获取位置

Question

在我的应用中，我希望在应用启动期间获取当前位置。在我的主要活动（第一个活动）中，首先我获得位置（纬度和经度）并保存共享首选项。之后，我放置HomeFragment。当应用程序打开时我想看HomeFragment。在我的HomeFragment中，我希望获得sharedPrefreferences而不是使用位置和纬度信息来计算距离。但是，这不起作用，当我启动应用程序时，它会在保存SharePreferences之前放置HomeFragment。

这是我的MainActivity：

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {
@Override
     protected void onCreate(Bundle savedInstanceState) {
            MyLocation myLocation = new MyLocation(this);
            myLocation.getLocation(this, locationResult);
            super.onCreate(savedInstanceState);

            setContentView(R.layout.activity_main);

            FragmentTransaction tx = getSupportFragmentManager().beginTransaction();
            tx.replace(R.id.flContent, new HomeFragment());
            tx.commit();

        public MyLocation.LocationResult locationResult = new MyLocation.LocationResult() {

            @Override
            public void gotLocation(Location location) {
                // TODO Auto-generated method stub
                double Longitude = location.getLongitude();
                double Latitude = location.getLatitude();

                try {
                    System.out.println("lat"+Latitude);
                    System.out.println("long"+Longitude);
                    SharedPreferences locationpref = getApplication()
                            .getSharedPreferences("location", MODE_PRIVATE);
                    SharedPreferences.Editor prefsEditor = locationpref.edit();  prefsEditor.commit();
                    prefsEditor.putString("Longitude", Longitude + "");
                    prefsEditor.putString("Latitude", Latitude + "");


                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        };

    }

HomeFragment：

public class HomeFragment extends Fragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);

        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment


        View rootView = inflater.inflate(R.layout.fragment_home, container, false);
        listView = (ListView) rootView.findViewById(R.id.list);
        adapter = new CustomListAdapter(getActivity(), restaurantList);
        listView.setAdapter(adapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Bundle bundle = new Bundle();
                bundle.putString("restaurantId", String.valueOf(restaurantList.get(position).getId()));
                MenuLineItemFragment fragment2 = new MenuLineItemFragment();
                FragmentManager fragmentManager = getFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.flContent, fragment2);
                fragmentTransaction.addToBackStack(null);
                fragmentTransaction.commit();

            }
        });


        SharedPreferences pref = getActivity().getApplication().getSharedPreferences("location", MODE_PRIVATE);
        latitude = pref.getString("Latitude","");
        longitude = pref.getString("Longitude","");

        if(i==1){
            request(); //I use longitude and latitude information in this method.
            i++;
        }



        return rootView;

    }

在我的清单文件中，我授予权限。

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

如何在启动应用程序中获取当前位置？此外，如果用户的位置关闭，我该怎么办？