WiFi关闭流程

/android/packages/apps/Settings/src/com/android/settings/wifi/WifiEnabler.java：

public boolean onSwitchToggled(boolean isChecked) {
	mWifiManager.setWifiEnabled(isChecked)
}

/android/frameworks/base/wifi/java/android/net/wifi/WifiManager.java:

public boolean setWifiEnabled(boolean enabled) {
	return mService.setWifiEnabled(mContext.getOpPackageName(), enabled);
}

通过AIDL调用到：
/android/frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiServiceImpl.java：

public synchronized boolean setWifiEnabled2(String packageName, int staId, boolean enable) {
	if (staId == STA_PRIMARY) {
           mWifiController.sendMessage(CMD_WIFI_TOGGLED);//发送CDM_WIFI_TOGGLED消息
       } 
}

/android/frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiController.java：
/WifiController收到广播，在Wifi开启的时候，WifiController停留在mStaEnabledState/

class StaEnabledState extends State {
	case CMD_WIFI_TOGGLED:
		//isWifiToggleEnabled()为false，表示要关闭WiFi
		if (! mSettingsStore.isWifiToggleEnabled()) {
			transitionTo(mStaDisabledState);//切换至StaDisabledState
		}

/进入StaDisabledState状态后，首先进入enter()方法/

class StaDisabledState extends State {
	public void enter() {
		mActiveModeWarden.disableWifi();
	}
}

到ActiveModeWarden类的内部类ModeStateMachine（状态机）。
/android/frameworks/opt/net/wifi/service/java/com/android/server/wifi/ActiveModeWarden.java：

public void disableWifi() {
       changeMode(ModeStateMachine.CMD_DISABLE_WIFI);
}
private void changeMode(int newMode) {
       mModeStateMachine.sendMessage(newMode);
}//最后发送了CMD_DISABLE_WIFI这个消息。

在这个方法内处理消息

private boolean checkForAndHandleModeChange(Message message) {
	case ModeStateMachine.CMD_DISABLE_WIFI:
		/ModeStateMachine在Wifi开启的时候，处于mClientModeActiveState状态
		mModeStateMachine.transitionTo(mWifiDisabledState);
}

在切换状态时，调用mClientModeActiveState的exit()方法，在exit()方法中调用的ClientModeManager的stop()方法，更新wifi状态从Enabled->Disabling。
/android/frameworks/opt/net/wifi/service/java/com/android/server/wifi/ClientModeManager.java：

public void stop() {
	if (mIfaceIsUp) {
		updateWifiState(WifiManager.WIFI_STATE_DISABLING,WifiManager.WIFI_STATE_ENABLED);
	}
	mStateMachine.quitNow();
}

//在WIFI开启的时候，ClientModeStateMachine处于StartedState状态

在状态机退出的时候会执行其exit()方法。

private class StartedState extends State {
	public void exit() {
		mClientModeImpl.setOperationalMode(ClientModeImpl.DISABLED_MODE, null);//使切换状态
		mWifiNative.teardownInterface(mClientInterfaceName);//底层进行关闭处理
		//更新wifi状态从Disabling->Disabled
		updateWifiState(WifiManager.WIFI_STATE_DISABLED,WifiManager.WIFI_STATE_DISABLING);
		 mStateMachine.quitNow();
	}
}

/android/frameworks/opt/net/wifi/service/java/com/android/server/wifi/ClientModeImpl.java：

public void setOperationalMode(int mode, String ifaceName) {
	 if (mode != CONNECT_MODE) {
		// we are disabling client mode...   need to exit connect mode now
		transitionTo(mDefaultState);
	}
}

切换状态至初始状态mDefaultState。这个状态机在已连接中，处于mConnectModeState状态，所以当切换状态之前需要执行mConnectModeState的exit（）方法。

class ConnectModeState extends State {
	public void exit() {
		 // Inform WifiConnectivityManager that Wifi is disabled
		mWifiConnectivityManager.setWifiEnabled(false);
		mWifiNative.removeAllNetworks(mInterfaceName);//关闭后是直接关闭或者进入仅扫描的状态，分两种。
		stopClientMode();//清理状态
	}
}

WiFi状态发生变化会调用/android/frameworks/opt/net/wifi/service/java/com/android/server/wifi/ActiveModeWarden.java的

class ClientModeActiveState extends ModeActiveState {
	public void onStateChanged(int state) {
		else if (state == WifiManager.WIFI_STATE_DISABLED) {
			 // client mode stopped
			mModeStateMachine.sendMessage(CMD_CLIENT_MODE_STOPPED, this);
		}
	}
}

case CMD_CLIENT_MODE_STOPPED:
	// notify WifiController that ClientMode stopped
	 mClientModeCallback.onStateChanged(WifiManager.WIFI_STATE_DISABLED);
	 mModeStateMachine.transitionTo(mWifiDisabledState);

本文地址：https://blog.csdn.net/weixin_43159275/article/details/110493471