Java tutorial
//package com.java2s; import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.support.annotation.NonNull; public class Main { public static boolean isNetConnect(@NonNull Context context) { ConnectivityManager service = (ConnectivityManager) context.getApplicationContext() .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo info = service.getActiveNetworkInfo(); return info != null && info.isAvailable(); } }