Android編程實現連接Wifi(運用Wifi 相關 API)

最近,由於作業要求要做一個android應用。其中一個功能模塊是通過程序來實現wifi的自動連接。之前沒有接觸過android，但是以前用過java(菜鳥級)……呵呵，扯遠了。

       這兩天對android的wifi功能研究了一下。下面共享出自己封裝的WifiConnect類。（這裏參考了ZXing開源項目中wifi模塊）

       首先，要了解android關於wifi的API.

       如果你喜歡看English API，這是android關於wifi的API地址：

http://developer.android.com/reference/android/net/wifi/package-summary.html（配置Wifi，還需要設定權限，android中關於wifi的API文檔中說明了要添加什麼權限）

       如果你一看英語就頭疼，這裏有關於wifi的api的中文解釋

http://note.sdo.com/u/1500295617/n/prb71~jGAHfpnM0l000bgN

       切入正題,這裏貼出一個封裝了的類(WifiConnect)，在實例化WifiConnect對象時，需要傳入一個WifiManager對象。WifiConnect類向外部提供一個Connect方法，參數是無線的SSID，password，還有加密類型。

/*
 *  WifiConnect.java
 *  Author: cscmaker
 */
package com.wifi.connect;

import java.util.List;

import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.util.Log;

public class WifiConnect {

    WifiManager wifiManager;

//定義幾種加密方式，一種是WEP，一種是WPA，還有沒有密碼的情況
    public enum WifiCipherType
    {
      WIFICIPHER_WEP,WIFICIPHER_WPA, WIFICIPHER_NOPASS, WIFICIPHER_INVALID
    }

//構造函數
    public WifiConnect(WifiManager wifiManager)
    {
      this.wifiManager = wifiManager;
    }

//打開wifi功能
     private boolean OpenWifi()
     {
         boolean bRet = true;
         if (!wifiManager.isWifiEnabled())
         {
          bRet = wifiManager.setWifiEnabled(true);
         }
         return bRet;
     }

//提供一個外部接口，傳入要連接的無線網
     public boolean Connect(String SSID, String Password, WifiCipherType Type)
     {
        if(!this.OpenWifi())
        {
             return false;
        }
//開啓wifi功能需要一段時間(我在手機上測試一般需要1-3秒左右)，所以要等到wifi
//狀態變成WIFI_STATE_ENABLED的時候才能執行下面的語句
        while(wifiManager.getWifiState() == WifiManager.WIFI_STATE_ENABLING )
        {
             try{
     //爲了避免程序一直while循環，讓它睡個100毫秒在檢測……
              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(tempConfig.networkId);
        }

      int netID = wifiManager.addNetwork(wifiConfig);
        boolean bRet = wifiManager.enableNetwork(netID, false);
        return bRet;
     }

    //查看以前是否也配置過這個網絡
     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(WifiConfiguration.GroupCipher.CCMP);
            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;
     }

}