if (mSelected != null) {

mWifiManager.updateNetwork(config);

saveNetworks();

}

} else {

int networkId =mWifiManager.addNetwork(config);

if (networkId != -1) {

mWifiManager.enableNetwork(networkId, false);

config.networkId =networkId;

if (mDialog.edit || requireKeyStore(config)){

saveNetworks();

} else {

connect(networkId);

}

}

}

}

}

FrameworksbasewifijavaandroidnetwifiWifiManager.java

public intupdateNetwork(WifiConfiguration config) {

if(config == null || config.networkId 0) {

return -1;

}

return addOrUpdateNetwork(config);

}

private intaddOrUpdateNetwork(WifiConfiguration config) {

try {

return mService.addOrUpdateNetwork(config);

} catch (RemoteException e) {

return -1;

}

}

WifiService.addOrUpdateNetwork()通過調(diào)用mWifiStateTracker.setNetworkVariable()將連接命令發(fā)送到Wpa_supplicant。

(4)獲取IP地址

當(dāng)連接到supplicant后，WifiMonitor就會(huì)通知WifiStateTracker。

Frameworks/base/wifi/java/android/net/wifi/WifiMonitor.java

Public void Run(){

if (connectToSupplicant()) {

// Send a message indicatingthat it is now possible to send commands

// to the supplicant

mWifiStateTracker.notifySupplicantConnection();

} else {

mWifiStateTracker.notifySupplicantLost();

return;

}

……

}

WifiStateTracker發(fā)送EVENT_SUPPLICANT_CONNECTION消息到消息隊(duì)列，這個(gè)消息有自己的handlermessage()函數(shù)處理，它會(huì)啟動(dòng)一個(gè)DHCP線程，而這個(gè)線程會(huì)一直等待一個(gè)消息事件，來啟動(dòng)DHCP協(xié)議分配IP地址。

frameworks/base/wifi/java/android/net/wifi/WifiStateTracker.java

void notifySupplicantConnection() {

sendEmptyMessage(EVENT_SUPPLICANT_CONNECTION);

}

public void handleMessage(Message msg) {

Intent intent;

switch (msg.what) {

case EVENT_SUPPLICANT_CONNECTION:

……

HandlerThread dhcpThread = newHandlerThread(DHCP Handler Thread);

dhcpThread.start();

mDhcpTarget = newDhcpHandler(dhcpThread.getLooper(), this);

……

……

}

當(dāng)Wpa_supplicant連接到AP后，它會(huì)發(fā)送一個(gè)消息給上層來通知連接成功，WifiMonitor會(huì)接受到這個(gè)消息并上報(bào)給WifiStateTracker。

Frameworks/base/wifi/java/android/net/wifi/WifiMonitor.java

void handleEvent(int event, String remainder) {

switch (event) {

case DISCONNECTED:

handleNetworkStateChange(NetworkInfo.DetailedState.DISCONNECTED,remainder);

break;

case CONNECTED:

handleNetworkStateChange(NetworkInfo.DetailedState.CONNECTED,remainder);

break;

……

}

private voidhandleNetworkStateChange(NetworkInfo.DetailedState newState, String data) {

StringBSSID = null;

intnetworkId = -1;

if(newState == NetworkInfo.DetailedState.CONNECTED) {

Matcher match = mConnectedEventPattern.matcher(data);

if(!match.find()) {

if (Config.LOGD) Log.d(TAG, Could not find BSSID in CONNECTEDevent string);

}else {

BSSID = match.group(1);

try {

networkId = Integer.parseInt(match.group(2));

} catch (NumberFormatException e) {

networkId = -1;

}

}

}

mWifiStateTracker.notifyStateChange(newState,BSSID, networkId);

}

void notifyStateChange(DetailedState newState, StringBSSID, int networkId) {

Messagemsg = Message.obtain(

this, EVENT_NETWORK_STATE_CHANGED,

newNetworkStateChangeResult(newState, BSSID, networkId));

msg.sendToTarget();

}

caseEVENT_NETWORK_STATE_CHANGED:

……

configureInterface();

……

private void configureInterface() {

checkPollTimer();

mLastSignalLevel = -1;

if(!mUseStaticIp) { //使用DHCP線程動(dòng)態(tài)IP

if(!mHaveIpAddress !mObtainingIpAddress) {

mObtainingIpAddress = true;

//發(fā)送啟動(dòng)DHCP線程獲取IP

mDhcpTarget.sendEmptyMessage(EVENT_DHCP_START);

}

} else { //使用靜態(tài)IP，IP信息從mDhcpInfo中獲取

intevent;

if(NetworkUtils.configureInterface(mInterfaceName, mDhcpInfo)) {

mHaveIpAddress = true;

event = EVENT_INTERFACE_CONFIGURATION_SUCCEEDED;

if (LOCAL_LOGD) Log.v(TAG, Static IP configurationsucceeded);

}else {

mHaveIpAddress = false;

event = EVENT_INTERFACE_CONFIGURATION_FAILED;

if (LOCAL_LOGD) Log.v(TAG, Static IP configuration failed);

}

sendEmptyMessage(event); //發(fā)送IP獲得成功消息事件

}

}

DhcpThread獲取EVENT_DHCP_START消息事件后，調(diào)用handleMessage()函數(shù)，啟動(dòng)DHCP獲取IP地址的服務(wù)。