Android连接指定Wifi的Demo分享

给定App相应SSID及密码，连接指定WIFI。

1、MainActivity.java包含工具类WifiAdmin

package com.example.connectwifi;  
  
import java.util.List;  
  
import android.app.Activity;  
import android.content.Context;  
import android.net.wifi.ScanResult;  
import android.net.wifi.WifiConfiguration;  
import android.net.wifi.WifiInfo;  
import android.net.wifi.WifiManager;  
import android.net.wifi.WifiManager.WifiLock;  
import android.os.Bundle;  
  
public class MainActivity extends Activity {  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        WifiAdmin wa = new WifiAdmin(this);  
        wa.openWifi();  
        wa.addNetwork(wa.CreateWifiInfo("CMM-687", "11223344", 3));  
    }  
  
    public class WifiAdmin {   
        // 定义WifiManager对象    
        private WifiManager mWifiManager;   
        // 定义WifiInfo对象    
        private WifiInfo mWifiInfo;   
        // 扫描出的网络连接列表    
        private List<ScanResult> mWifiList;   
        // 网络连接列表    
        private List<WifiConfiguration> mWifiConfiguration;   
        // 定义一个WifiLock    
        WifiLock mWifiLock;   
  
       
        //构造函数    
        public WifiAdmin(Context context) {   
            // 取得WifiManager对象    
            mWifiManager = (WifiManager) context   
                    .getSystemService(Context.WIFI_SERVICE);   
            // 取得WifiInfo对象    
            mWifiInfo = mWifiManager.getConnectionInfo();   
        }   
       
        // 打开WIFI    
        public void openWifi() {   
            if (!mWifiManager.isWifiEnabled()) {   
                mWifiManager.setWifiEnabled(true);   
            }   
        }   
       
        // 关闭WIFI    
        public void closeWifi() {   
            if (mWifiManager.isWifiEnabled()) {   
                mWifiManager.setWifiEnabled(false);   
            }   
        }   
       
        // 检查当前WIFI状态    
        public int checkState() {   
            return mWifiManager.getWifiState();   
        }   
       
        // 锁定WifiLock    
        public void acquireWifiLock() {   
            mWifiLock.acquire();   
        }   
       
        // 解锁WifiLock    
        public void releaseWifiLock() {   
            // 判断时候锁定    
            if (mWifiLock.isHeld()) {   
                mWifiLock.acquire();   
            }   
        }   
       
        // 创建一个WifiLock    
        public void creatWifiLock() {   
            mWifiLock = mWifiManager.createWifiLock("Test");   
        }   
       
        // 得到配置好的网络    
        public List<WifiConfiguration> getConfiguration() {   
            return mWifiConfiguration;   
        }   
       
        // 指定配置好的网络进行连接    
        public void connectConfiguration(int index) {   
            // 索引大于配置好的网络索引返回    
            if (index > mWifiConfiguration.size()) {   
                return;   
            }   
            // 连接配置好的指定ID的网络    
            mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId,   
                    true);   
        }   
       
        public void startScan() {   
            mWifiManager.startScan();   
            // 得到扫描结果    
            mWifiList = mWifiManager.getScanResults();   
            // 得到配置好的网络连接    
            mWifiConfiguration = mWifiManager.getConfiguredNetworks();   
        }   
       
        // 得到网络列表    
        public List<ScanResult> getWifiList() {   
            return mWifiList;   
        }   
       
        // 查看扫描结果    
        public StringBuilder lookUpScan() {   
            StringBuilder stringBuilder = new StringBuilder();   
            for (int i = 0; i < mWifiList.size(); i++) {   
                stringBuilder   
                        .append("Index_" + new Integer(i + 1).toString() + ":");   
                // 将ScanResult信息转换成一个字符串包    
                // 其中把包括：BSSID、SSID、capabilities、frequency、level    
                stringBuilder.append((mWifiList.get(i)).toString());   
                stringBuilder.append("/n");   
            }   
            return stringBuilder;   
        }  
       
        // 得到MAC地址    
        public String getMacAddress() {   
            return (mWifiInfo == null) ? "NULL" : mWifiInfo.getMacAddress();   
        }   
       
        // 得到接入点的BSSID    
        public String getBSSID() {   
            return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID();   
        }   
       
        // 得到IP地址    
        public int getIPAddress() {   
            return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress();   
        }   
       
        // 得到连接的ID    
        public int getNetworkId() {   
            return (mWifiInfo == null) ? 0 : mWifiInfo.getNetworkId();   
        }   
       
        // 得到WifiInfo的所有信息包    
        public String getWifiInfo() {   
            return (mWifiInfo == null) ? "NULL" : mWifiInfo.toString();   
        }   
       
        // 添加一个网络并连接    
        public void addNetwork(WifiConfiguration wcg) {   
         int wcgID = mWifiManager.addNetwork(wcg);   
         boolean b =  mWifiManager.enableNetwork(wcgID, true);   
         System.out.println("a--" + wcgID);  
         System.out.println("b--" + b);  
        }   
       
        // 断开指定ID的网络    
        public void disconnectWifi(int netId) {   
            mWifiManager.disableNetwork(netId);   
            mWifiManager.disconnect();   
        }   
       
    //然后是一个实际应用方法，只验证过没有密码的情况：  
       
        public WifiConfiguration CreateWifiInfo(String SSID, String Password, int Type)   
        {   
              WifiConfiguration config = new WifiConfiguration();     
               config.allowedAuthAlgorithms.clear();   
               config.allowedGroupCiphers.clear();   
               config.allowedKeyManagement.clear();   
               config.allowedPairwiseCiphers.clear();   
               config.allowedProtocols.clear();   
              config.SSID = "\"" + SSID + "\"";     
                
              WifiConfiguration tempConfig = this.IsExsits(SSID);             
              if(tempConfig != null) {    
                  mWifiManager.removeNetwork(tempConfig.networkId);    
              }  
                
              if(Type == 1) //没有密码的情况  
              {   
                   config.wepKeys[0] = "";   
                   config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);   
                   config.wepTxKeyIndex = 0;   
              }   
              if(Type == 2) //WEP加密的情况  
              {   
                  config.hiddenSSID = true;  
                  config.wepKeys[0]= "\""+Password+"\"";   
                  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 == 3) //WPA加密的情况  
              {   
              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.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);  
              config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);  
              config.status = WifiConfiguration.Status.ENABLED;     
              }  
               return config;   
        }   
          
        private WifiConfiguration IsExsits(String SSID)    
        {    
            List<WifiConfiguration> existingConfigs = mWifiManager.getConfiguredNetworks();    
               for (WifiConfiguration existingConfig : existingConfigs)     
               {    
                 if (existingConfig.SSID.equals("\""+SSID+"\""))    
                 {    
                     return existingConfig;    
                 }    
               }    
            return null;     
        }  
        
    }  
      
}  

2、Manifest.xml添加对应权限

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="https://schemas.android.com/apk/res/android"  
    package="com.example.connectwifi"  
    android:versionCode="1"  
    android:versionName="1.0" >  
  
    <uses-sdk  
        android:minSdkVersion="14"  
        android:targetSdkVersion="14" />  
  
    <application  
        android:allowBackup="true"  
        android:icon="@drawable/ic_launcher"  
        android:label="@string/app_name"  
        android:theme="@style/AppTheme" >  
        <activity  
            android:name=".MainActivity"  
            android:label="@string/app_name" >  
            <intent-filter>  
                <action android:name="android.intent.action.MAIN" />  
  
                <category android:name="android.intent.category.LAUNCHER" />  
            </intent-filter>  
        </activity>  
    </application>  
      
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>   
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>  
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>   
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>  
</manifest>