Android控制WIFI相關操作

在XML文件中添加權限：

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>  
<uses-permission android:name="android.permission.WAKE_LOCK"/>  
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>  

Wifi工具類：

package com.example.mywifi;

import java.net.Inet4Address;
import java.util.List;

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;

public class WifiOpenHelper {
    // 定義WifiManager對象
    private WifiManager mWifiManager;
    // 定義WifiInfo對象
    private WifiInfo mWifiInfo;
    // 掃描出的網絡連接列表
    private List<ScanResult> mWifiList;
    // 網絡連接列表
    private List<WifiConfiguration> mWifiConfiguration;
    // 定義一個WifiLock
    WifiLock mWifiLock;
 
    // 構造器
    public WifiOpenHelper(Context context) {
        // 取得WifiManager對象
        mWifiManager = (WifiManager) context
                .getSystemService(Context.WIFI_SERVICE);
        // 取得WifiInfo對象
        mWifiInfo = mWifiManager.getConnectionInfo();
    }
 
    // 打開WIFI
    public void openWifi() {
        if (!mWifiManager.isWifiEnabled()) {
            mWifiManager.setWifiEnabled(true);
        }
    }
 
    // 斷開當前網絡
    public void disconnectWifi() {
        if (!mWifiManager.isWifiEnabled()) {
            mWifiManager.disconnect();
        }
    }
 
    // 關閉WIFI
    public void closeWifi() {
        if (mWifiManager.isWifiEnabled()) {
            mWifiManager.setWifiEnabled(false);
        }
    }
 
    // 檢查當前WIFI狀態
    public int checkState() {
        return mWifiManager.getWifiState();
    }
 
    // 鎖定WifiLock
    public void acquireWifiLock() {
        mWifiLock.acquire();
    }
 
    // 解鎖WifiLock
    public void releaseWifiLock() {
        // 判斷時候鎖定
        if (mWifiLock.isHeld()) {
            mWifiLock.acquire();
        }
    }
 
    // 創建一個WifiLock
    public void creatWifiLock() {
        mWifiLock = mWifiManager.createWifiLock("Test");
    }
 
    // 得到配置好的網絡
    public List<WifiConfiguration> getConfiguration() {
        return mWifiConfiguration;
    }
 
    // 指定配置好的網絡進行連接
    public void connectConfiguration(int index) {
        // 索引大於配置好的網絡索引返回
        if (index > mWifiConfiguration.size()) {
            return;
        }
        // 連接配置好的指定ID的網絡
        mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId,
                true);
    }
 
    public void startScan() {
        mWifiManager.startScan();
        // 得到掃描結果
        mWifiList = mWifiManager.getScanResults();
        // 得到配置好的網絡連接
        mWifiConfiguration = mWifiManager.getConfiguredNetworks();
    }
 
    // 得到網絡列表
    public List<ScanResult> getWifiList() {
        return mWifiList;
    }
 
    // 查看掃描結果
    public StringBuilder lookUpScan() {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < mWifiList.size(); i++) {
            stringBuilder.append("Index_" + Integer.valueOf(i + 1).toString()
                    + ":");
            // 將ScanResult信息轉換成一個字符串包
            // 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();
    }
 
    // 得到接入點的BSSID
    public String getBSSID() {
        return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID();
    }
 
    // 得到IP地址
    public int getIPAddress() {
        return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress();
    }
 // 將int類型的IP轉換成字符串形式的IP   
    public String ipIntToString(int ip) {   
    try {   
    byte[] bytes = new byte[4];   
    bytes[0] = (byte) (0xff & ip);   
    bytes[1] = (byte) ((0xff00 & ip) >> 8);   
    bytes[2] = (byte) ((0xff0000 & ip) >> 16);   
    bytes[3] = (byte) ((0xff000000 & ip) >> 24);   
    return Inet4Address.getByAddress(bytes).getHostAddress();   
    } catch (Exception e) {   
    return "";   
    }   
    } 
 
    // 得到連接的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();
    }
 
    // 添加一個網絡並連接
    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);
    }
 
    // 斷開指定ID的網絡
    public void disconnectWifi(int netId) {
        mWifiManager.disableNetwork(netId);
        mWifiManager.disconnect();
    }
 
    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) // WIFICIPHER_NOPASS
        {
            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
        }
        if (Type == 2) // WIFICIPHER_WEP
        {
            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) // 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.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;
    }
}