最好的方法:

public static boolean isOnline() {
    try {
    InetAddress.getByName("google.com").isReachable(3);

    return true;
    } catch (UnknownHostException e){
    return false;
    } catch (IOException e){
    return false;
    }
    }

以下是来自我的Utils类的代码:

public static boolean isNetworkAvailable(Context context) {
        ConnectivityManager connectivityManager 
              = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}

使用方法:

private fun isInternetAvailable(context: Context): Boolean {
    (context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager).run {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            return this.getNetworkCapabilities(this.activeNetwork)?.hasCapability(
                NetworkCapabilities.NET_CAPABILITY_INTERNET
            ) ?: false
        } else {
            (@Suppress("DEPRECATION")
            return this.activeNetworkInfo?.isConnected ?: false)
        }
    }
}

所需权限:

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

更新29/06/2015 如果你正在使用Xamarin。Android和想要检查连接，你可以使用Nuget包，这将给你在多个平台上的功能。好的候选人在这里和这里。 [更新结束]

The Answers above are quite good, but they are all in Java, and almost all of them check for a connectivity. In my case, I needed to have connectivity with a specific type of connection and I am developing on Xamarin.Android. Moreover, I do not pass a reference to my activities Context in the Hardware layer, I use the Application Context. So here is my solution, in case somebody comes here with similar requirements. I have not done full testing though, will update the answer once I am done with my testing

using Android.App;
using Android.Content;
using Android.Net;

namespace Leopard.Mobile.Hal.Android
{
    public class AndroidNetworkHelper
    {
        public static AndroidNetworkStatus GetWifiConnectivityStatus()
        {
            return GetConnectivityStatus(ConnectivityType.Wifi);
        }

        public static AndroidNetworkStatus GetMobileConnectivityStatus()
        {
            return GetConnectivityStatus(ConnectivityType.Mobile);
        }

        #region Implementation

        private static AndroidNetworkStatus GetConnectivityStatus(ConnectivityType connectivityType)
        {
            var connectivityManager = (ConnectivityManager)Application.Context.GetSystemService(Context.ConnectivityService);
            var wifiNetworkInfo = connectivityManager.GetNetworkInfo(connectivityType);
            var result = GetNetworkStatus(wifiNetworkInfo);
            return result;
        }

        private static AndroidNetworkStatus GetNetworkStatus(NetworkInfo wifiNetworkInfo)
        {
            var result = AndroidNetworkStatus.Unknown;
            if (wifiNetworkInfo != null)
            {
                if (wifiNetworkInfo.IsAvailable && wifiNetworkInfo.IsConnected)
                {
                    result = AndroidNetworkStatus.Connected;
                }
                else
                {
                    result = AndroidNetworkStatus.Disconnected;
                }
            }
            return result;
        } 

        #endregion
    }

    public enum AndroidNetworkStatus
    {
        Connected,
        Disconnected,
        Unknown
    }

下面是一些现代代码，使用AsynTask来解决android崩溃的问题，当你尝试在主线程上连接并为用户引入一个带有冲洗和重复选项的警报。

class TestInternet extends AsyncTask<Void, Void, Boolean> {
    @Override
    protected Boolean doInBackground(Void... params) {
        try {
            URL url = new URL("http://www.google.com");
            HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
            urlc.setConnectTimeout(3000);
            urlc.connect();
            if (urlc.getResponseCode() == 200) {
                return true;
            }
        } catch (MalformedURLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
            return false;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
        return false;
    }

    @Override
    protected void onPostExecute(Boolean result) {
        if (!result) { // code if not connected
            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
            builder.setMessage("An internet connection is required.");
            builder.setCancelable(false);

            builder.setPositiveButton(
                    "TRY AGAIN",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            dialog.cancel();
                            new TestInternet().execute();
                        }
                    });


            AlertDialog alert11 = builder.create();
            alert11.show();
        } else { // code if connected
            doMyStuff();
        }
    }
}

...

new TestInternet().execute();

这是最简单和简单的方法来检查互联网连接的wifi和移动数据。

public static boolean isConnected(Activity _context) {
        if (_context != null) {
            ConnectivityManager connMgr = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo activeInfo = connMgr.getActiveNetworkInfo();
            if (activeInfo != null && activeInfo.isConnected()) {
                boolean wifiConnected = activeInfo.getType() == ConnectivityManager.TYPE_WIFI;
                boolean mobileConnected = activeInfo.getType() == ConnectivityManager.TYPE_MOBILE;

                if (wifiConnected || mobileConnected) {
                    Log.d(TAG, "Wifi Connected ");
                    return true;
                } else {
                    showAlert(_context,_context.getString(R.string.err_no_internet));
                    return false;
                }
            } else {
                showAlert(_context,_context.getString(R.string.err_no_internet));
                return false;
            }
        } else {
            Log.e(TAG, "networkConnectivity: Context NULL");

        }
        return false;
    }