NETWORK_PROVIDER 和 GPS_PROVIDER 在片段中返回 null

Posted 2023-02-23

【中文标题】NETWORK_PROVIDER 和 GPS_PROVIDER 在片段中返回 null

【英文标题】：NETWORK_PROVIDER and GPS_PROVIDER returns null in fragments

【发布时间】：2014-11-26 07:04:53

【问题描述】：

我面临的问题

nwLocation & gpsLocation 在 onStart() 处为空

我有清单

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

---

FrgAddNewJobsLocation.java（类扩展片段）

@Override
public void onStart() 

    super.onStart();

    initilizeMap();
    appLocationService = new AppLocationService(getActivity());
    nwLocation = appLocationService.getLocation(LocationManager.NETWORK_PROVIDER);
    gpsLocation = appLocationService.getLocation(LocationManager.GPS_PROVIDER);

AppLocationService.java

public class AppLocationService extends Service implements LocationListener 

    protected LocationManager locationManager;
    Location location;

    private static final long MIN_DISTANCE_FOR_UPDATE = 10;
    private static final long MIN_TIME_FOR_UPDATE = 1000 * 60 * 2;

    public AppLocationService(Context context) 

        locationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);
    

    public Location getLocation(String provider) 

        if (locationManager.isProviderEnabled(provider)) 

            locationManager.requestLocationUpdates(provider, MIN_TIME_FOR_UPDATE, MIN_DISTANCE_FOR_UPDATE, this);
            if (locationManager != null) 

                location = locationManager.getLastKnownLocation(provider);
                return location;
            
        
        return null;
    

    @Override
    public void onLocationChanged(Location location) 

    @Override
    public void onProviderDisabled(String provider) 

    @Override
    public void onProviderEnabled(String provider) 

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

    @Override
    public IBinder onBind(Intent arg0) 

        return null;
    

【问题讨论】：

如果你把它们放在onActivityCreted里呢？

这可能看起来很傻，但设备上是否启用了位置设置？

【参考方案1】：

而不是appLocationService = new AppLocationService(getActivity());

使用：

Context mcontext;      
appLocationService = new AppLocationService(mContext);

还要检查您是否在清单文件中提供了互联网权限