WIFI就是一种无线联网技术,常见的是使用无线路由器。那么在这个无线路由器的信号覆盖的范围内都可以采用WIFI连接的方式进行联网。如果无线路由器连接了一个ADSL线路或其他的联网线路,则又被称为“热点”。
在Android中对Wifi操作,android本身提供了一些有用的包,在android.net.wifi包下面,主要包括以下几个类和接口:
1.ScanResult
主要用来描述已经检测出的接入点,包括接入点的地址,接入点的名称,身份认证,频率,信号强度等信息。其实就是通过wifi 硬件的扫描来获取一些周边的wifi 热点的信息。
2.WifiConfiguration
Wifi网络的配置,包括安全设置等,在我们连通一个wifi 接入点的时候,需要获取到的一些信息。主要包含四个属性:
BSSID:
BSS是一种特殊的Ad-hoc LAN(一种支持点对点访问的无线网络应用模式)的应用,一个无线网络至少由一个连接到有线网络的AP和若干无线工作站组成,这种配置称为一个基本服务装置。一群计算机设定相同的 BSS名称,即可自成一个group,而此BSS名称,即所谓BSSID。通常,手机WLAN中,bssid其实就是无线路由的MAC地址。
networkid:网络ID。
PreSharedKey:无线网络的安全认证模式。
SSID:SSID(Service Set Identif)用于标识无线局域网,SSID不同的无线网络是无法进行互访的。
3.WifiInfo
wifi无线连接的描述,包括(接入点,网络连接状态,隐藏的接入点,IP地址,连接速度,MAC地址,网络ID,信号强度等信息)。这里简单介绍一下WifiManager中常用的方法:
getSSID() |
获得SSID(热点名称) |
getBSSID() |
获取BSSID |
getDetailedStateOf() |
获取客户端的连通性 |
getHiddenSSID() | 获得SSID 是否被隐藏 |
getIpAddress() | 获取IP 地址 |
getLinkSpeed() | 获得连接的速度 |
getMacAddress() | 获得Mac 地址 |
getRssi() |
获得802.11n 网络的信号 |
4.WifiManager
wifi连接统一管理类,获取WIFI网卡的状态(WIFI网卡的状态是由一系列的整形常量来表示的)
WIFI_STATE_DISABLING = 0 | WIFI网卡正在关闭 |
WIFI_STATE_DISABLED = 1 | WIFI网卡不可用 |
WIFI_STATE_ENABLING = 2 | WIFI网正在打开 (WIFI启动需要一段时间) |
WIFI_STATE_ENABLED = 3 | WIFI网卡可用 |
WIFI_STATE_UNKNOWN = 4 | 未知网卡状态 |
WIFI_AP_STATE_DISABLING = 10 | WIFI热点正在关闭 |
WIFI_AP_STATE_DISABLED = 11 | WIFI热点不可用 |
WIFI_AP_STATE_ENABLING = 12 | WIFI热点正在打开 |
WIFI_AP_STATE_ENABLED = 13 | WIFI热点可用 |
5. 在AndroidManifest.xml进行对WIFI操作的权限设置
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<!-- 以下是使用wifi访问网络所需的权限 --> <uses-permission android:name= "android.permission.CHANGE_NETWORK_STATE" ></uses-permission>
<uses-permission android:name= "android.permission.CHANGE_WIFI_STATE" ></uses-permission>
<uses-permission android:name= "android.permission.ACCESS_NETWORK_STATE" ></uses-permission>
<uses-permission android:name= "android.permission.ACCESS_WIFI_STATE" ></uses-permission>
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下面是汇总的一个wifi管理工具类,我完善了一下,并加上了详细的注解,很实用的!
WifiAdmin类: (wifi管理工具类)
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package com.zhf.wifidemo.wifi.utils;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Iterator;
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;
/** * WIFI管理类
* @author ZHF
*
*/
public class WifiAdmin {
private static WifiAdmin wifiAdmin = null ;
private List<WifiConfiguration> mWifiConfiguration; //无线网络配置信息类集合(网络连接列表)
private List<ScanResult> mWifiList; //检测到接入点信息类 集合
//描述任何Wifi连接状态
private WifiInfo mWifiInfo;
WifiManager.WifiLock mWifilock; //能够阻止wifi进入睡眠状态,使wifi一直处于活跃状态
public WifiManager mWifiManager;
/**
* 获取该类的实例(懒汉)
* @param context
* @return
*/
public static WifiAdmin getInstance(Context context) {
if (wifiAdmin == null ) {
wifiAdmin = new WifiAdmin(context);
}
return wifiAdmin;
}
private WifiAdmin(Context context) {
//获取系统Wifi服务 WIFI_SERVICE
this .mWifiManager = (WifiManager) context.getSystemService( "wifi" );
//获取连接信息
this .mWifiInfo = this .mWifiManager.getConnectionInfo();
}
/**
* 是否存在网络信息
* @param str 热点名称
* @return
*/
private WifiConfiguration isExsits(String str) {
Iterator localIterator = this .mWifiManager.getConfiguredNetworks().iterator();
WifiConfiguration localWifiConfiguration;
do {
if (!localIterator.hasNext()) return null ;
localWifiConfiguration = (WifiConfiguration) localIterator.next();
} while (!localWifiConfiguration.SSID.equals( "\"" + str + "\"" ));
return localWifiConfiguration;
}
/**锁定WifiLock,当下载大文件时需要锁定 **/
public void AcquireWifiLock() {
this .mWifilock.acquire();
}
/**创建一个WifiLock**/
public void CreateWifiLock() {
this .mWifilock = this .mWifiManager.createWifiLock( "Test" );
}
/**解锁WifiLock**/
public void ReleaseWifilock() {
if (mWifilock.isHeld()) { //判断时候锁定
mWifilock.acquire();
}
}
/**打开Wifi**/
public void OpenWifi() {
if (! this .mWifiManager.isWifiEnabled()){ //当前wifi不可用
this .mWifiManager.setWifiEnabled( true );
}
}
/**关闭Wifi**/
public void closeWifi() {
if (mWifiManager.isWifiEnabled()) {
mWifiManager.setWifiEnabled( false );
}
}
/**端口指定id的wifi**/
public void disconnectWifi( int paramInt) {
this .mWifiManager.disableNetwork(paramInt);
}
/**添加指定网络**/
public void addNetwork(WifiConfiguration paramWifiConfiguration) {
int i = mWifiManager.addNetwork(paramWifiConfiguration);
mWifiManager.enableNetwork(i, true );
}
/**
* 连接指定配置好的网络
* @param index 配置好网络的ID
*/
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 );
}
/**
* 根据wifi信息创建或关闭一个热点
* @param paramWifiConfiguration
* @param paramBoolean 关闭标志
*/
public void createWifiAP(WifiConfiguration paramWifiConfiguration, boolean paramBoolean) {
try {
Class localClass = this .mWifiManager.getClass();
Class[] arrayOfClass = new Class[ 2 ];
arrayOfClass[ 0 ] = WifiConfiguration. class ;
arrayOfClass[ 1 ] = Boolean.TYPE;
Method localMethod = localClass.getMethod( "setWifiApEnabled" ,arrayOfClass);
WifiManager localWifiManager = this .mWifiManager;
Object[] arrayOfObject = new Object[ 2 ];
arrayOfObject[ 0 ] = paramWifiConfiguration;
arrayOfObject[ 1 ] = Boolean.valueOf(paramBoolean);
localMethod.invoke(localWifiManager, arrayOfObject);
return ;
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 创建一个wifi信息
* @param ssid 名称
* @param passawrd 密码
* @param paramInt 有3个参数,1是无密码,2是简单密码,3是wap加密
* @param type 是"ap"还是"wifi"
* @return
*/
public WifiConfiguration createWifiInfo(String ssid, String passawrd, int paramInt, String type) {
//配置网络信息类
WifiConfiguration localWifiConfiguration1 = new WifiConfiguration();
//设置配置网络属性
localWifiConfiguration1.allowedAuthAlgorithms.clear();
localWifiConfiguration1.allowedGroupCiphers.clear();
localWifiConfiguration1.allowedKeyManagement.clear();
localWifiConfiguration1.allowedPairwiseCiphers.clear();
localWifiConfiguration1.allowedProtocols.clear();
if (type.equals( "wt" )) { //wifi连接
localWifiConfiguration1.SSID = ( "\"" + ssid + "\"" );
WifiConfiguration localWifiConfiguration2 = isExsits(ssid);
if (localWifiConfiguration2 != null ) {
mWifiManager.removeNetwork(localWifiConfiguration2.networkId); //从列表中删除指定的网络配置网络
}
if (paramInt == 1 ) { //没有密码
localWifiConfiguration1.wepKeys[ 0 ] = "" ;
localWifiConfiguration1.allowedKeyManagement.set( 0 );
localWifiConfiguration1.wepTxKeyIndex = 0 ;
} else if (paramInt == 2 ) { //简单密码
localWifiConfiguration1.hiddenSSID = true ;
localWifiConfiguration1.wepKeys[ 0 ] = ( "\"" + passawrd + "\"" );
} else { //wap加密
localWifiConfiguration1.preSharedKey = ( "\"" + passawrd + "\"" );
localWifiConfiguration1.hiddenSSID = true ;
localWifiConfiguration1.allowedAuthAlgorithms.set( 0 );
localWifiConfiguration1.allowedGroupCiphers.set( 2 );
localWifiConfiguration1.allowedKeyManagement.set( 1 );
localWifiConfiguration1.allowedPairwiseCiphers.set( 1 );
localWifiConfiguration1.allowedGroupCiphers.set( 3 );
localWifiConfiguration1.allowedPairwiseCiphers.set( 2 );
}
} else { //"ap" wifi热点
localWifiConfiguration1.SSID = ssid;
localWifiConfiguration1.allowedAuthAlgorithms.set( 1 );
localWifiConfiguration1.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
localWifiConfiguration1.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
localWifiConfiguration1.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
localWifiConfiguration1.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
localWifiConfiguration1.allowedKeyManagement.set( 0 );
localWifiConfiguration1.wepTxKeyIndex = 0 ;
if (paramInt == 1 ) { //没有密码
localWifiConfiguration1.wepKeys[ 0 ] = "" ;
localWifiConfiguration1.allowedKeyManagement.set( 0 );
localWifiConfiguration1.wepTxKeyIndex = 0 ;
} else if (paramInt == 2 ) { //简单密码
localWifiConfiguration1.hiddenSSID = true ; //网络上不广播ssid
localWifiConfiguration1.wepKeys[ 0 ] = passawrd;
} else if (paramInt == 3 ) { //wap加密
localWifiConfiguration1.preSharedKey = passawrd;
localWifiConfiguration1.allowedAuthAlgorithms.set( 0 );
localWifiConfiguration1.allowedProtocols.set( 1 );
localWifiConfiguration1.allowedProtocols.set( 0 );
localWifiConfiguration1.allowedKeyManagement.set( 1 );
localWifiConfiguration1.allowedPairwiseCiphers.set( 2 );
localWifiConfiguration1.allowedPairwiseCiphers.set( 1 );
}
}
return localWifiConfiguration1;
}
/**获取热点名**/
public String getApSSID() {
try {
Method localMethod = this .mWifiManager.getClass().getDeclaredMethod( "getWifiApConfiguration" , new Class[ 0 ]);
if (localMethod == null ) return null ;
Object localObject1 = localMethod.invoke( this .mWifiManager, new Object[ 0 ]);
if (localObject1 == null ) return null ;
WifiConfiguration localWifiConfiguration = (WifiConfiguration) localObject1;
if (localWifiConfiguration.SSID != null ) return localWifiConfiguration.SSID;
Field localField1 = WifiConfiguration. class .getDeclaredField( "mWifiApProfile" );
if (localField1 == null ) return null ;
localField1.setAccessible( true );
Object localObject2 = localField1.get(localWifiConfiguration);
localField1.setAccessible( false );
if (localObject2 == null ) return null ;
Field localField2 = localObject2.getClass().getDeclaredField( "SSID" );
localField2.setAccessible( true );
Object localObject3 = localField2.get(localObject2);
if (localObject3 == null ) return null ;
localField2.setAccessible( false );
String str = (String) localObject3;
return str;
} catch (Exception localException) {
}
return null ;
}
/**获取wifi名**/
public String getBSSID() {
if ( this .mWifiInfo == null )
return "NULL" ;
return this .mWifiInfo.getBSSID();
}
/**得到配置好的网络 **/
public List<WifiConfiguration> getConfiguration() {
return this .mWifiConfiguration;
}
/**获取ip地址**/
public int getIPAddress() {
return (mWifiInfo == null ) ? 0 : mWifiInfo.getIpAddress();
}
/**获取物理地址(Mac)**/
public String getMacAddress() {
return (mWifiInfo == null ) ? "NULL" : mWifiInfo.getMacAddress();
}
/**获取网络id**/
public int getNetworkId() {
return (mWifiInfo == null ) ? 0 : mWifiInfo.getNetworkId();
}
/**获取热点创建状态**/
public int getWifiApState() {
try {
int i = ((Integer) this .mWifiManager.getClass()
.getMethod( "getWifiApState" , new Class[ 0 ])
.invoke( this .mWifiManager, new Object[ 0 ])).intValue();
return i;
} catch (Exception localException) {
}
return 4 ; //未知wifi网卡状态
}
/**获取wifi连接信息**/
public WifiInfo getWifiInfo() {
return this .mWifiManager.getConnectionInfo();
}
/** 得到网络列表**/
public List<ScanResult> getWifiList() {
return this .mWifiList;
}
/**查看扫描结果**/
public StringBuilder lookUpScan() {
StringBuilder localStringBuilder = new StringBuilder();
for ( int i = 0 ; i < mWifiList.size(); i++)
{
localStringBuilder.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
localStringBuilder.append((mWifiList.get(i)).toString());
localStringBuilder.append( "\n" );
}
return localStringBuilder;
}
/** 设置wifi搜索结果 **/
public void setWifiList() {
this .mWifiList = this .mWifiManager.getScanResults();
}
/**开始搜索wifi**/
public void startScan() {
this .mWifiManager.startScan();
}
/**得到接入点的BSSID**/
public String GetBSSID() {
return (mWifiInfo == null ) ? "NULL" : mWifiInfo.getBSSID();
}
} |
最后,成功连接到wifi后,通过本机IP地址便可以进行相关网络开发,在下一篇中我会讲解一个WIFI热点搜索、创建、连接的Demo(http://smallwoniu.blog.51cto.com/3911954/1338618),希望能帮助到大家!