1 首先,要实现一个简单的WIFI连接设置,我们需要掌握和WIFI功能相关的一些类,比如WIfiManager,WifiInfo,ScanResult,WifiConfiguration等,提供了WIFI连接相关的基本的API.
比如:
打开关闭网关:wifiManager.setWifiEnabled(true/false);
扫描周边网络:wifiManager.getScanResults();
连接指定网络:wifiManager.enableNetwork(networkId,true);
添加网络:wifiManager.addNetwork(wcg);
移除网络:wifiManager.removeNetwork(netId);
获取网卡状态:wifiManager.getWifiState()
……
2 扫描的网络将会被保存在一个List<
ScanResult
>中,同时WifiManager会为我们维护一个List<
WifiConfiguration
>,这个List中保存了我们已经连接过的配置好的网络连接.
当我们选择一个网络时,判断它是否存在于这个List中,存在即可直接连接,否则需要用户输入密码创建一个新的WifiConfiguration.
3 获得的ScanResult中将会保存有该无线连接的相关信息,包括SSID,BSSID,capabilities,level等属性,其中SSID号是该连接的一个标识符,比如我们经常看到的TP_LINKXXX.
capabilities中保存了相关加密信息,比如WEB和WPA等.level则表示信号度.
4 在获取连接状态时,即调用wifiManager.getWifiState()或者wifiInfo.getSupplicantState()时,通 常在用户已经授权成功后,我们获得的状态值就为COMPLETED,此时不管网络是否已经连接成功,我们都无法获得新的状态. 所以要判断WIFI网络是否已经真的连接成功需要用到如下方法判断:
ConnectivityManager connManager = (ConnectivityManager) WifiConnection.this
.getSystemService(CONNECTIVITY_SERVICE);
// 获取代表联网状态的NetWorkInfo对象
NetworkInfo networkInfo = connManager.getActiveNetworkInfo();
if(networkInfo != null && networkInfo.getType() == 1
&& wifiAdmin.getWifiInfo().getSSID()!=null)
{
//WIFI网络连接成功
}
5 获取本地IP地址的方法:
public String getLocalIpAddress() {
try {
for (Enumeration<
NetworkInterface
> en = NetworkInterface
.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<
InetAddress
> enumIpAddr = intf
.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
return inetAddress.getHostAddress().toString();
}
}
}
} catch (SocketException ex) {
Log.e("WifiPreference IpAddress", ex.toString());
}
return null;
}
6 在创建一个新的WifiConfiguration时,切记SSID和preSharedKey必须添加双引号,否则必将会导致连接失败.正确写法如下:
//创建一个新的WifiConfiguration
WifiConfiguration wcg = new WifiConfiguration();
wcg.BSSID = mBSSID;
//SSID和preSharedKey必须添加双引号,否则将会导致连接失败
wcg.SSID = """ + mSSID + """;
wcg.hiddenSSID = false;
wcg.status = WifiConfiguration.Status.ENABLED;
wcg.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
wcg.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);
wcg.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
wcg.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
wcg.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
wcg.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
//如果加密模式为WEP
if(mSecurity.equals("WEP"))
{
wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
wcg.wepKeys[0] =""" + editText.getText().toString() + """; //This is the WEP Password
wcg.wepTxKeyIndex = 0;
}
//如果加密模式为WPA EPA
else if(mSecurity.equals("WPA EAP"))
{
wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_EAP);
wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
wcg.preSharedKey = """ + editText.getText().toString() + """;
}
//如果加密模式为WPA PSK
else if(mSecurity.equals("WPA PSK"))
{
wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
wcg.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
wcg.preSharedKey = """ + editText.getText().toString() + """;
}
//无加密
else
{
wcg.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
}