广州第一网站,中山精品网站建设精英,功能型网站制作多少钱,中国十大龙头企业排名Android P相比于Android O的变化
多了WifiStateMachinePrime#xff08;状态机的前处理机制#xff09;#xff0c;wifiService的相关cmd 不再是直接send 给WifiStateMachine#xff0c;而是被送到WifiStateMachinePrime先进行处理后#xff0c;再送往WifiStateMachine也…Android P相比于Android O的变化
多了WifiStateMachinePrime状态机的前处理机制wifiService的相关cmd 不再是直接send 给WifiStateMachine而是被送到WifiStateMachinePrime先进行处理后再送往WifiStateMachine也多了一层ClientModeManager处理将之前初始化wpa_supplicant专门抽出一层类在这里面来做详细看后面的代码
Wifi 整体流程框架图
基本与Android O Wifi 主体框架一致三板斧的套路还是被传承下来1. Application – 2. WiFiService(WifiStateMachine) – 3. WifiNativewpa_supplicant – wlan drv 代码流程
1. WifiSettings -- WifiManager
点击 wifi button 开启wifi 触发的代码流程如下
wifiSettings 响应onPreferenceTreeClick 送往WifiEnableWifiEnabler 根据传入的状态call WifiManager 设置wifi状态 开启跳转到WifiServiceImpl
packages/apps/Settings/src/com/android/settings/wifi/WifiSettings.javapublic boolean onPreferenceTreeClick(Preference preference){..... return super.onPreferenceTreeClick(preference);}packages/apps/Settings/src/com/android/settings/wifi/WifiEnabler.java
public boolean onSwitchToggled(boolean isChecked){
....
mWifiManager.setWifiEnabled(isChecked); // wifiManager 设置wifi 状态
}
2. WifiManager -- WifiService -- WifiServiceImpl --WifiController
还是老套路逐级进入WifiServiceWifiServiceImpl WifiControllerWifiStateMachinePrimeWifiNative 等完成CMD_WIFI_TOGGLED的火炬传递注意随着Android 版本升级后接递火炬CMD_WIFI_TOGGLED的顺序也发生了变化Android P 版本WifiServiceImpl 将CMD_WIFI_TOGGLED 先送到了WifiController处理这里稍微有点儿复杂的状态机都会涉及到处理此cmd具体根据设备所处状态来跟就可以。这里以设备从开机状态第一次打开wifi为场景进行说明此case 直接会进入
frameworks/base/wifi/java/android/net/wifi/WifiManager.java
public boolean setWifiEnabled(boolean enabled){return mService.setWifiEnabled(mContext.getOpPackageName(), enabled); // jump to WifiServiceImpl
}frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiServiceImpl.java
public synchronized boolean setWifiEnabled(String packageName, boolean enable){
....
mWifiController.sendMessage(CMD_WIFI_TOGGLED);
}frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiController.javaclass StaDisabledState extends State {
....public boolean processMessage(Message msg) {switch (msg.what) {case CMD_WIFI_TOGGLED:.....transitionTo(mDeviceActiveState); // jump to DeviceActiveState
}
}class DeviceActiveState extends State {public void enter() {mWifiStateMachinePrime.enterClientMode(); // jump to WifiStateMachinePrimemWifiStateMachine.setHighPerfModeEnabled(false);}}
3. WifiController -- WifiStateMachinePrime
WifiStateMachinePrime 传递CMD_START_CLIENT_MODE先在内部状态机完成一轮转动ModeStateMachine -- ClientModeActiveState送往ClientModeManager 创建WifiClientModeManager 实例
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiStateMachinePrime.java
public void enterClientMode() {
changeMode(ModeStateMachine.CMD_START_CLIENT_MODE);
}private class ModeStateMachine extends StateMachine {
...private boolean checkForAndHandleModeChange(Message message) {case ModeStateMachine.CMD_START_CLIENT_MODE:mModeStateMachine.transitionTo(mClientModeActiveState); //跳转到ClientModeActiveState}}class ClientModeActiveState extends ModeActiveState {public void enter() {mManager mWifiInjector.makeClientModeManager(mListener); //创建ClientModeManager实例mManager.start(); //mActiveModeManagers.add(mManager);updateBatteryStatsWifiState(true);}
}4. WifiStateMachinePrime -- ClientModeManager
ClientModeManager 传递ClientModeStateMachine.CMD_START 开始wpa_supplicant初始化信号更新 wifiState updateWifiState通过WifiNative初始化Client Mode
frameworks/opt/net/wifi/service/java/com/android/server/wifi/ClientModeManager.java
public void start() {
mStateMachine.sendMessage(ClientModeStateMachine.CMD_START);
}private class IdleState extends State {
public boolean processMessage(Message message) {case CMD_START:updateWifiState(WifiManager.WIFI_STATE_ENABLING,WifiManager.WIFI_STATE_DISABLED);mClientInterfaceName mWifiNative.setupInterfaceForClientMode(false /* not low priority */, mWifiNativeInterfaceCallback);if (TextUtils.isEmpty(mClientInterfaceName)) {Log.e(TAG, Failed to create ClientInterface. Sit in Idle);updateWifiState(WifiManager.WIFI_STATE_UNKNOWN,WifiManager.WIFI_STATE_ENABLING);updateWifiState(WifiManager.WIFI_STATE_DISABLED,WifiManager.WIFI_STATE_UNKNOWN);break;}sendScanAvailableBroadcast(false); //send wifi Scan Available BroadcastmScanRequestProxy.enableScanningForHiddenNetworks(false);mScanRequestProxy.clearScanResults();transitionTo(mStartedState);}
}
5. ClientModeManager -- WifiNative
ClientModeManager 通过CMD_START 将启动传递给WifiNativeWifiNative 启动wpa_supplicant servicewifiNative 通过SupplicantStaHal 建立与 wpa_supplicant/hidl/1.1 的sta_iface.cpp 关联ifaceNamewifiNative 向NetworkManagementService 注册NetworkObserverInternal 实例用于监视 设备iface一举一动wifiNative 开启wifiMonitor 其开始接手所有的事项消息以及事件一有变化就上报framework(wifiStateMachine、wifiServiceImpl、SupplicantStaIfaceHal等等就像是东厂的小兵监视着下面的一举一动一有变化马上上报头头
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiNative.java
public String setupInterfaceForClientMode(boolean lowPrioritySta, NonNull InterfaceCallback interfaceCallback) {... startSupplicant(); // 启动 wpa_supplicant .. mWificondControl.setupInterfaceForClientMode(iface.name); // 初始化与wificondcontrol 关联(用于后续wificond 作为framework与 wpa_supplicant 之间的通信信使..mSupplicantStaIfaceHal.setupIface(iface.name); // mWifiMonitor.startMonitoring(iface.name); // 启动WifiMonitor 上报所有的wpa_supplicant msgevent initializeNwParamsForClientInterface(iface.name);
}6. WifiNative– WificondControl
WificondControl 通过 binder 连接到wificond server.cpp创建ClientInterfaceWificondControl 通过binder 连接到 client_interface_binder.cpp 获取 wificondScaner 用于wifi scan上报scan resultsWificondControl 创建 pnoScan Scan Event Handler 且将之与设备 ifaceName 关联
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WificondControl.java
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WificondControl.javapublic IClientInterface setupInterfaceForClientMode(NonNull String ifaceName){... clientInterface mWificond.createClientInterface(ifaceName); //创建ClientInterface..mClientInterfaces.put(ifaceName, clientInterface); IWifiScannerImpl wificondScanner clientInterface.getWifiScannerImpl(); // 获取WifiScannerImplPnoScanEventHandler pnoScanEventHandler new PnoScanEventHandler(ifaceName);mPnoScanEventHandlers.put(ifaceName, pnoScanEventHandler);wificondScanner.subscribePnoScanEvents(pnoScanEventHandler);
}
