使用 GPS 的权限错误

Question

我想找回手机的位置，但这条线有问题：

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,10000,0,(LocationListener) this);

我知道问题是权限检查，但我不知道在我的代码中执行此操作：

package com.cmn.cmnvtc;

import android.app.Fragment;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;


public class MainPageFragment1 extends Fragment implements OnMapReadyCallback, LocationListener {


    LocationManager locationManager;
    public LatLng myLocation;



    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_main1, container, false);


        locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,10000,0,(LocationListener) this);
        return v;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        MapFragment fragment = (MapFragment) getChildFragmentManager().findFragmentById(R.id.map);
        fragment.getMapAsync(this);

    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        LatLng marker = new LatLng(48.9818555, 2.270541);
        googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(marker, 15));
        googleMap.addMarker(new MarkerOptions().title("Le garage").position(marker));
        googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

    }

    @Override
    public void onLocationChanged(Location location) {
        if(location != null){
            Toast.makeText(getActivity(), "Latitude:" + location.getLatitude() + " - Longitude:" + location.getLongitude(), Toast.LENGTH_SHORT);
        }
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }
}

请问我该怎么做？

我的错误在代码中：“添加权限检查”

Answer 1

您需要检查它是否有 Marshmollow

private static final int GRANTED = PackageManager.PERMISSION_GRANTED;

if (checkCoarseLocationPermission(getActivity()) &&  checkFineLocationPermission(getActivity())) {
        //permissions are granted
    }else {
        requestLocationPermission(getActivity());
    }
}

public boolean checkCoarseLocationPermission(Activity mActivity){
    int permissionCheck = ContextCompat.checkSelfPermission(mActivity,
            Manifest.permission.ACCESS_COARSE_LOCATION);
    return permissionCheck == GRANTED;
}

public boolean checkFineLocationPermission(Activity mActivity){
    int permissionCheck = ContextCompat.checkSelfPermission(mActivity,
            Manifest.permission.ACCESS_FINE_LOCATION);
    return permissionCheck == GRANTED;
}

public void requestLocationPermission(Activity mActivity){
    ActivityCompat.requestPermissions(mActivity,
            new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION},
            MY_PERMISSIONS_REQUEST_LOCATION);
}

Answer 2

您需要在应用的清单中添加权限。打开你的 manifest.xml 并输入这两行：

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

ACCESS_FINE_LOCATION 允许您的应用使用实际 GPS 跟踪用户位置。 ACCESS_COARSE_LOCATION 允许您的应用使用 WiFi 网络跟踪用户位置，因此如果您只使用 GPS，则可以省略此项。

Answer 3

试试这个 公共无效onLocationChanged（位置位置）{ 如果（位置！= null）{ location = locationManager .getLastKnownLocation(LocationManager.GPS_PROVIDER); Toast.makeText(getActivity(), "纬度:" + location.getLatitude() + " - 经度:" + location.getLongitude(), Toast.LENGTH_SHORT); } }