Java tutorial
//package com.java2s; import android.app.Activity; import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; public class Main { public static boolean checkNet(Activity act) { ConnectivityManager manager = (ConnectivityManager) act.getApplicationContext() .getSystemService(Context.CONNECTIVITY_SERVICE); if (manager == null) { return false; } NetworkInfo networkinfo = manager.getActiveNetworkInfo(); if (networkinfo == null || !networkinfo.isAvailable()) { return false; } return true; } }