Java tutorial
//package com.java2s; //License from project: Apache License import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.net.wifi.WifiManager; public class Main { public static void reconnectWifi(Context context, int networkId) { ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo ni = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI); if (ni != null) { WifiManager wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); if (networkId > -1) { wm.enableNetwork(networkId, true); } } } }