Java tutorial
//package com.java2s; import android.content.Context; import android.content.pm.PackageManager; import android.net.ConnectivityManager; import android.net.NetworkInfo; public class Main { public static boolean isNetAvailable(Context paramContext) { if ("1".equals(getNetType(paramContext)[0]) || "2".equals(getNetType(paramContext)[0])) { return true; } return false; } public static String[] getNetType(Context paramContext) { String[] arrayOfString = { "Unknown", "Unknown" }; PackageManager localPackageManager = paramContext.getPackageManager(); if (localPackageManager.checkPermission("android.permission.ACCESS_NETWORK_STATE", paramContext.getPackageName()) != 0) { arrayOfString[0] = "Unknown"; return arrayOfString; } ConnectivityManager localConnectivityManager = (ConnectivityManager) paramContext .getSystemService("connectivity"); if (localConnectivityManager == null) { arrayOfString[0] = "Unknown"; return arrayOfString; } NetworkInfo localNetworkInfo1 = localConnectivityManager.getNetworkInfo(1); if (localNetworkInfo1 != null && localNetworkInfo1.getState() == NetworkInfo.State.CONNECTED) { arrayOfString[0] = "2"; return arrayOfString; } NetworkInfo localNetworkInfo2 = localConnectivityManager.getNetworkInfo(0); if (localNetworkInfo2 != null && localNetworkInfo2.getState() == NetworkInfo.State.CONNECTED) { arrayOfString[0] = "1"; arrayOfString[1] = localNetworkInfo2.getSubtypeName(); return arrayOfString; } return arrayOfString; } }