android 笔记

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: [e-mail]
 * @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();
    }
}