android 笔记 --- wifi应用

Android-开启和关闭wifi的代码段


1、需要申请的权限

android.permission.ACCESS_WIFI_STATE 
android.permission.CHANGE_WIFI_STATE 
android.permission.WAKE_LOCK

2、获取WifiManager

wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);

3、开启、关闭wifi

if (wifiManager.isWifiEnabled()) {  
wifiManager.setWifiEnabled(false);  
} else {  
wifiManager.setWifiEnabled(true);  
}

4、注意

如果遇到force-close, 选wait即可, 因为启动wifi需要几秒钟, UI如果5妙钟还没反映的话, 系统会给你这个force close exception


Android Wifi的使用

package com.Aina.Android;  
 
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;  
 
/** 
 * com.Aina.Android Pro_wifi 
 *  
 * @author Aina.huang E-mail: [email protected] 
 * @version 创建时间：2010 Jul 21, 2010 12:29:00 PM 类说明 
 */  
public class WifiAdmin {  
 
    private WifiManager mWifiManager = null;  
    private WifiInfo mWifiInfo = null;  
    private List<ScanResult> mWifiList = null;// 扫描出的网络连接列表  
    private List<WifiConfiguration> mWifiConfiguration = null;// 网络连接列表  
    private WifiLock mWifiLock = null;  
 
    public WifiAdmin(Context mContext) {  
        mWifiManager = (WifiManager) mContext  
                .getSystemService(mContext.WIFI_SERVICE);  
        mWifiInfo = mWifiManager.getConnectionInfo();  
    }  
 
    public void OpenWifi() {  
        if (!mWifiManager.isWifiEnabled()) {  
            mWifiManager.setWifiEnabled(true);// 打开wifi  
        }  
    }  
 
    public void CloseWife() {  
        if (mWifiManager.isWifiEnabled()) {  
            mWifiManager.setWifiEnabled(false);// 关闭wifi  
        }  
    }  
 
    public void lockWifi() {  
        mWifiLock.acquire();// 锁定wifi  
    }  
 
    public void rlockWifi() {  
        if (mWifiLock.isHeld()) {  
            mWifiLock.acquire();// 解锁wifi  
        }  
    }  
 
    public void Createwifilock() {  
        mWifiLock = mWifiManager.createWifiLock("Testss");// 创建一个wifilock  
    }  
 
    public List<WifiConfiguration> GetConfinguration() {  
        return mWifiConfiguration;// 得到配置好的网络  
    }  
 
    public void ConnectConfiguration(int index) {  
        if (index > mWifiConfiguration.size()) {  
            return;  
        }  
        mWifiManager.enableNetwork(mWifiConfiguration.get(index).networkId, true);//连接配置好的指定ID的网络  
    }  
    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);   
        mWifiManager.enableNetwork(wcgID, true);   
    }  
    //断开指定ID的网络  
    public void DisconnectWifi(int netId)  
    {  
        mWifiManager.disableNetwork(netId);  
        mWifiManager.disconnect();  
    }  
}