如何在应用程序启动期间获取位置

Z时代
2024-01-10
分类：问答

在我的应用程序中，我希望在应用程序启动期间获取当前位置。在我的主要活动（第一个活动）中，首先获取位置（经度和纬度）并保存共享首选项。之后，我放置HomeFragment。我想在应用程序打开时看到HomeFragment。在我的HomeFragment中，我想获取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，它在保存SharePreferences之前放置HomeFragment。如何在应用程序启动期间获取位置

这里是我的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，我给的权限。

<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期间获取当前位置？另外，如果用户的位置关闭，我应该怎么做？