c# - 连接管理器在 xamarin.android fragment 中不起作用

Question

在我的应用程序中，我想测试设备是否已连接到互联网并相应地运行一些代码，在搜索互联网后显然以下代码应该可以工作:

ConnectivityManager connMgr = (ConnectivityManager)getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();

但事实并非如此。

调试器告诉我

the name getActivity doesn't exist in the current context

这段代码有什么问题？这是完整的 fragment2.cs 文件:

using Android.OS;
using Android.Support.V4.App;
using Android.Views;
using Android.Webkit;
using Android.Net;
using Android.Widget;

using System;

namespace TabsApp.Fragments
{
    public class Fragment2 : Fragment
    {
        public override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Create your fragment here
        }

        public static Fragment2 NewInstance()
        {
            var frag2 = new Fragment2 { Arguments = new Bundle() };
            return frag2;
        }


        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            var ignored = base.OnCreateView(inflater, container, savedInstanceState);

            View v = inflater.Inflate(Resource.Layout.fragment2, container, false);

            ConnectivityManager connMgr = (ConnectivityManager)getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();

            return v;
        }
    }
}

Answer 1

你在这里做的是java代码:

Xamarin 适用于 C#，因此 getter 和 setter 不是方法而是属性:

   ConnectivityManager connMgr = (ConnectivityManager)this.Activity.GetSystemService(Android.Content.Context.ConnectivityService);
            NetworkInfo networkInfo = connMgr.ActiveNetworkInfo;

祝你好运!