LocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER)在Galaxy S7上始终返回NULL(仅) [英] LocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER) always returns NULL on Galaxy S7 (ONLY)

问题描述

刚收到运行棉花糖(6.0.1)的Galaxy S7(Edge)，发现我的应用程序使用 android.permission.ACCESS_COARSE_LOCATION 并针对Sdk版本22(Lollipop)出现问题.当我调用 locationManager.getLastKnownLocation()时，它总是返回NULL.这是我正在运行的内容:

Just received a Galaxy S7 (Edge) running Marshmallow (6.0.1) and find that it has an issue with my app that uses android.permission.ACCESS_COARSE_LOCATION and targets Sdk Version 22 (Lollipop). When I call locationManager.getLastKnownLocation() it always returns NULL. Here's what I'm running:

public Location getLastKnownLocationObject(Context context) {

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

    try {
        if (locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
            Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            // Location is always null on S7 (only)
            Log.i(TAG, ">>> getLastKnownLocationObject() getLastKnownLocation: " + location);
            return location;
        }

    } catch (Exception e) {
        Log.e(TAG, ">>> getLastKnownLocationObject() exception", e);
    }
    return null;

}

相同的代码在我尝试过的所有其他设备上都可以正常运行:Galaxy S5(5.0.1)，Nexus 7(5.0.1)，Nexus 9(6.0.1)和Samsung Tab3(4.4.2)

This same code works fine on every other device I've tried: Galaxy S5 (5.0.1), Nexus 7 (5.0.1), Nexus 9 (6.0.1), and Samsung Tab3 (4.4.2)

请注意，如果我将清单更改为使用ACCESS_FINE_LOCATION，则以上代码在每个设备上都可以正常工作.不幸的是，管理层目前不允许我更改权限.

Note that if I change the manifest to use ACCESS_FINE_LOCATION, the above code works fine on every device. Unfortunately, management won't allow me to change permissions at this time.

在SO上看到的一些答案中，建议在执行getLastKnownLocation()之前先调用以下命令，但这没有任何效果.

In a few answers I've seen here on SO, it's suggested to call the following prior to doing the getLastKnownLocation(), but that didn't have any effect.

locationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER, 0, 0, new LocationListener() {
                            @Override
                            public void onStatusChanged(String provider, int status, Bundle extras) {
                            }

                            @Override
                            public void onProviderEnabled(String provider) {
                            }

                            @Override
                            public void onProviderDisabled(String provider) {
                            }

                            @Override
                            public void onLocationChanged(final Location location) {
                                // NEVER CALLED on Samsung S7 for LocationManager.NETWORK_PROVIDER
                            }
                        });

因此，目前，我觉得这是新三星Galaxy S7独有的问题.

So at the moment, I feel this is an issue exclusive to the new Samsung Galaxy S7.

推荐答案

根据我对Samsung设备的经验.如果重新启动电话，但您未启用GPS，则不会获得位置信息.如果您启用了GPS(例如通过运行Google Maps)，那么您将获得一个位置.三星不会为GPS，网络或无源提供商返回位置，除非在设备加电周期中找到了位置.

From my experience with Samsung devices. If you reboot the phone and you DON'T enable GPS you will not get a location. If you enable GPS as some point - maybe by running Google Maps, then you will get a location. Samsung does not return a location for GPS, Network or Passive providers unless it has gotten a location during the devices power on cycle.

我在代码中进行的任何调用都无法使其启动并激活并获得位置.他们可以在其他设备上正常工作.三星似乎也不会很长时间地缓存此信息.

None of the calls I have made in code ever get it to kick in and activate and get a location. They work fine on other devices. Samsung does not seem to cache this information for very long either.

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