本文主要向大家介绍Android应用开发，给定App相应SSID及密码，连接指定WIFI，希望对大家学习Android应用开发有所帮助。

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>

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