Android 使用位置管理器获取经纬度

Android Get latitude and longitude with location manager(Android 使用位置管理器获取经纬度)

问题描述

我正在尝试使用位置管理器获取用户位置，但该位置始终返回 null.我还要求用户打开 gps.

I'm trying to get the user location with location manager but the location always returns null. I also am asking to the user to turn on the gps.

这是我的代码:

   int permisioncheck = ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION);

    if(permisioncheck == 0){

        lm = (LocationManager)getContext().getSystemService(Context.LOCATION_SERVICE);

        List<String> providers = lm.getProviders(true);

        Location bestLocation = null;

        for (String provider : providers) {
            Location location = lm.getLastKnownLocation(provider);
            if (location == null) {
                continue;
            }

            if (bestLocation == null || location.getAccuracy() < bestLocation.getAccuracy()) {
                // Found best last known location: %s", l);
                bestLocation = location;
            }
        }

        if(bestLocation == null){
            System.out.println("is NULL!");
        }
    }else{

        ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
    }

希望有人能帮我找出错误，谢谢.

I hope that someone could help me to find the error, thanks.

推荐答案

错误"是您假设 getLastKnownLocation() 将返回 Location.通常，它会返回 null.使用 getLastKnownLocation() 作为可能的优化，否则您需要 requestLocationUpdates()，然后使用 onLocationChanged() 方法中的位置.

The "error" is that you are assuming that getLastKnownLocation() will return a Location. Frequently, it will return null. Use getLastKnownLocation() as a possible optimization, but otherwise you need to requestLocationUpdates(), then use the location in the onLocationChanged() method.

查看这个示例项目和文档了解更多信息.

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