android - 如何在Android中获取当前位置的经纬度？

Question

我有一个 fragment ，我想在其中显示用户(设备)的当前位置。我使用谷歌地图 Android API v2。如何获取设备当前的经纬度？

在下面您可以看到我使用的代码。不幸的是，应用程序运行不正常，与我预期的不同。它只显示 map ，但没有我设置的标记，也没有当前位置。任何人都可以检查并修复它吗？怎么了？感谢您的帮助!

编辑:

MainFragment.java

public class MainFragment extends Fragment{

    private SupportMapFragment mSupportMapFragment;
    private GoogleMap mGoogleMap;

    public BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {

        Bundle extras = intent.getExtras();
        LatLng temp = new LatLng(extras.getDouble("Latitude"),extras.getDouble("Longitude"));
    }
    };

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

        FragmentManager mFragmentManager = getChildFragmentManager();
        mSupportMapFragment = (SupportMapFragment) mFragmentManager.findFragmentById(R.id.map_container);
        if (mSupportMapFragment == null) {
            mSupportMapFragment = SupportMapFragment.newInstance();
            mFragmentManager.beginTransaction().replace(R.id.map_container, mSupportMapFragment).commit();
        }

        //Broadcast/ Filter
        IntentFilter filter = new IntentFilter();
        filter.addAction(LocationService.BROADCAST_ACTION);
        getActivity().registerReceiver(receiver, filter);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
           //Start service
           getActivity().startService(new Intent(getActivity(),LocationService.class));
    }

    @Override
    public void onResume(){
         receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            Log.d(TAG, "BroadcastReceiver works!");

            Bundle extras = intent.getExtras();
            final LatLng temp = new LatLng(extras.getDouble("Latitude"),extras.getDouble("Longitude"));

            if (mGoogleMap != null) {
                mGoogleMap = mSupportMapFragment.getMap();
                mGoogleMap.addMarker(new MarkerOptions().position(temp).title("Marker").snippet("Location"));
            }
            try {
                CameraUpdate center = CameraUpdateFactory.newLatLng(temp);
                CameraUpdate zoom = CameraUpdateFactory.zoomTo(15f);
                mGoogleMap.moveCamera(center);
                mGoogleMap.animateCamera(zoom);
            }catch (NumberFormatException e) {
                //Some code here for exception
            }
        }
    };
    }

    @Override
    public void onDetach() {
        super.onDetach();
        try {
            Field childFragmentManager = Fragment.class.getDeclaredField("mChildFragmentManager");
            childFragmentManager.setAccessible(true);
            childFragmentManager.set(this, null);
        } catch (NoSuchFieldException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }
}

fragment_main.xml

<RelativeLayout
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:id="@+id/map_container">

       <!-- The map fragments will go here -->
</RelativeLayout>

Answer 1

此信息以及更多信息在您的应用可以从融合位置提供程序检索的 Location 对象中可用:https://developer.android.com/training/location/retrieve-current.html .