通过程序来实现wifi的自动连接。
这两天对android的wifi功能研究了一下。下面共享出自己封装的WifiConnect类。（这里参考了ZXing开源项目中wifi模块）
首先，要了解android关于wifi的API.
如果你喜欢看English API，这是android关于wifi的API地址：
/reference/android/net/wifi/package-summary.html（配置Wifi，还需要设定权限，android中关于wifi的API文档中说明了要添加什么权限）
如果你一看英语就头疼，这里有关于wifi的api的中文解释
/u/1500295617/n/prb71~jGAHfpnM0l000bgN
切入正题,这里贴出一个封装了的类(WifiConnect)，在实例化WifiConnect对象时，需要传入一个WifiManager对象。WifiConnect类向外部提供一个Connect方法，参数是无线的SSID，password，还有加密类型。
/** WifiConnect.java* Author: cscmaker*/package com.wifi.connect;import java.util.List;import .wifi.WifiConfiguration;import .wifi.WifiManager;import android.util.Log;public class WifiConnect {WifiManager wifiManager;//定义几种加密方式，一种是WEP，一种是WPA，还有没有密码的情况public enum WifiCipherType{WIFICIPHER_WEP,WIFICIPHER_WPA, WIFICIPHER_NOPASS, WIFICIPHER_INVALID}//构造函数public WifiConnect(WifiManager wifiManager){this.wifiManager = wifiManager;}//打开wifi功能private boolean OpenWifi(){boolean bRet = true;if (!wifiManager.isWifiEnabled()){bRet = wifiManager.setWifiEnabled(true); }return bRet;}//提供一个外部接口，传入要连接的无线网public boolean Connect(String SSID, String Password, WifiCipherType Type){if(!this.OpenWifi()){return false;}//开启wifi功能需要一段时间(我在手机上测试一般需要1-3秒左右)，所以要等到wifi//状态变成WIFI_STATE_ENABLED的时候才能执行下面的语句while(wifiManager.getWifiState() == WifiManager.WIFI_STATE_ENABLING ){try{//为了避免程序一直while循环，让它睡个100毫秒在检测……Thread.currentThread();Thread.sleep(100);}catch(InterruptedException ie){}}WifiConfiguration wifiConfig = this.CreateWifiInfo(SSID, Password, Type);//if(wifiConfig == null){return false;}WifiConfiguration tempConfig = this.IsExsits(SSID);if(tempConfig != null){wifiManager.removeNetwork(workId);}int netID = wifiManager.addNetwork(wifiConfig);boolean bRet = wifiManager.enableNetwork(netID, false); return bRet;}//查看以前是否也配置过这个网络private WifiConfiguration IsExsits(String SSID){List<WifiConfiguration> existingConfigs = wifiManager.getConfiguredNetworks();for (WifiConfiguration existingConfig : existingConfigs) {if (existingConfig.SSID.equals("\""+SSID+"\"")){return existingConfig;}}return null; }private WifiConfiguration CreateWifiInfo(String SSID, String Password, WifiCipherType Type){WifiConfiguration config = new WifiConfiguration(); config.allowedAuthAlgorithms.clear();config.allowedGroupCiphers.clear();config.allowedKeyManagement.clear();config.allowedPairwiseCiphers.clear();config.allowedProtocols.clear();config.SSID = "\"" + SSID + "\""; if(Type == WifiCipherType.WIFICIPHER_NOPASS){config.wepKeys[0] = "";config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);config.wepTxKeyIndex = 0;}if(Type == WifiCipherType.WIFICIPHER_WEP){config.preSharedKey = "\""+Password+"\""; config.hiddenSSID = true; config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);config.allowedGroupCiphers.set(MP);config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);config.wepTxKeyIndex = 0;}if(Type == WifiCipherType.WIFICIPHER_WPA){config.preSharedKey = "\""+Password+"\"";config.hiddenSSID = true; config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); config.allowedProtocols.set(WifiConfiguration.Protocol.WPA); config.status = WifiConfiguration.Status.ENABLED; }else{return null;}return config;}}
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