Android Wifi方法大全

package com.yarin.android.Examples_08_08;
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 WifiAdmin
{
//定义WifiManager对象
privateWifiManager mWifiManager;
//定义WifiInfo对象
privateWifiInfo mWifiInfo;
//扫描出的网络连接列表
privateList<ScanResult> mWifiList;
//网络连接列表
privateList<WifiConfiguration>mWifiConfiguration;
//定义一个WifiLock
WifiLock mWifiLock;
//构造器
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
publicvoid OpenWifi()
{
if(!mWifiManager.isWifiEnabled())
{
mWifiManager.setWifiEnabled(true);

}
}
//关闭WIFI
publicvoid CloseWifi()
{
if(!mWifiManager.isWifiEnabled())
{
mWifiManager.setWifiEnabled(false);
}
}
//锁定WifiLock
publicvoid AcquireWifiLock()
{
mWifiLock.acquire();
}
//解锁WifiLock
publicvoid ReleaseWifiLock()
{
//判断时候锁定
if (mWifiLock.isHeld())
{
mWifiLock.acquire();
}
}
//创建一个WifiLock
publicvoid CreatWifiLock()
{
mWifiLock =mWifiManager.createWifiLock("Test");
}
//得到配置好的网络
publicList<WifiConfiguration>GetConfiguration()
{
return mWifiConfiguration;
}
//指定配置好的网络进行连接
publicvoid 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);
}
publicvoid 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
publicList<ScanResult> GetWifiList()
{
return mWifiList;
}
//查看扫描结果
publicStringBuilder 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
publicString GetMacAddress()
{
return (mWifiInfo == null) ?"NULL" : mWifiInfo.getMacAddress();
}
//得到接入点的BSSID
publicString GetBSSID()
{
return (mWifiInfo == null) ?"NULL" : mWifiInfo.getBSSID();
}
//得到IP地址
publicint GetIPAddress()
{
return (mWifiInfo == null) ? 0: mWifiInfo.getIpAddress();
}
//得到连接的ID
publicint GetNetworkId()
{
return (mWifiInfo == null) ? 0: mWifiInfo.getNetworkId();
}
//得到WifiInfo的所有信息包
publicString GetWifiInfo()
{
return (mWifiInfo == null) ?"NULL" : mWifiInfo.toString();
}
//添加一个网络并连接
publicvoid AddNetwork(WifiConfiguration wcg)
{
int wcgID =mWifiManager.addNetwork(wcg);
mWifiManager.enableNetwork(wcgID, true);
}
//断开指定ID的网络
publicvoid DisconnectWifi(int netId)
{
mWifiManager.disableNetwork(netId);
mWifiManager.disconnect();
}
}

注：

在android中，申请WakeLock可以使进程持续执行，即使进入睡眠模式，进程的执行也不间断，而且能保持屏幕常量。

WifiLock跟WakeLock用法作用与WakeLock相同，不过前者是针对Wifi的而已。

SMS Backup中关于WakeLock以及WifiLock的代码如下：

private static void acquireWakeLock(Context ctx) {
if (sWakeLock == null) {
PowerManager pMgr = (PowerManager) ctx.getSystemService(POWER_SERVICE);   //保持当前进程持续有效
sWakeLock = pMgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
"SmsSyncService.sync()wakelock.");

WifiManager wMgr = (WifiManager) ctx.getSystemService(WIFI_SERVICE);      //保持wifi有效
sWifiLock = wMgr.createWifiLock("SMSBackup");
}
sWakeLock.acquire();
sWifiLock.acquire();
}

用完一定要记得释放锁：

private static void releaseWakeLock(Context ctx) {
sWakeLock.release();
sWifiLock.release();
}

而且要注意在AndroidManifest.xml中注明wakelock权限的申请：

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