App调用接口

public static final int TETHERING_WIFI      = 0;
mConnectivityManager.startTethering(TETHERING_WIFI, true /* showProvisioningUi */,mOnStartTetheringCallback, new Handler(Looper.getMainLooper()));

ConnectivityManager.java 客户端提供接口

try {String pkgName = mContext.getOpPackageName();Log.i(TAG, "startTethering caller:" + pkgName);mService.startTethering(type, wrappedCallback, showProvisioningUi, pkgName);} catch (RemoteException e) {Log.e(TAG, "Exception trying to start tethering.", e);wrappedCallback.send(TETHER_ERROR_SERVICE_UNAVAIL, null);}

ConnectivityService.java 服务端执行

@Overridepublic void startTethering(int type, ResultReceiver receiver, boolean showProvisioningUi,String callerPkg) {ConnectivityManager.enforceTetherChangePermission(mContext, callerPkg);if (!isTetheringSupported()) {receiver.send(ConnectivityManager.TETHER_ERROR_UNSUPPORTED, null);return;}mTethering.startTethering(type, receiver, showProvisioningUi);}

Tethering.java

public void startTethering(int type, ResultReceiver receiver, boolean showProvisioningUi) {mEntitlementMgr.startProvisioningIfNeeded(type, showProvisioningUi);enableTetheringInternal(type, true /* enabled */, receiver);
}
private void enableTetheringInternal(int type, boolean enable, ResultReceiver receiver) {int result;switch (type) {case TETHERING_WIFI:result = setWifiTethering(enable);sendTetherResult(receiver, result);break;case TETHERING_USB:result = setUsbTethering(enable);sendTetherResult(receiver, result);break;case TETHERING_BLUETOOTH:setBluetoothTethering(enable, receiver);break;default:Log.w(TAG, "Invalid tether type.");sendTetherResult(receiver, TETHER_ERROR_UNKNOWN_IFACE);}}
private int setWifiTethering(final boolean enable) {final long ident = Binder.clearCallingIdentity();try {synchronized (mPublicSync) {final WifiManager mgr = getWifiManager();if (mgr == null) {mLog.e("setWifiTethering: failed to get WifiManager!");return TETHER_ERROR_SERVICE_UNAVAIL;}if ((enable && mgr.startSoftAp(null /* use existing wifi config */)) ||(!enable && mgr.stopSoftAp())) {mWifiTetherRequested = enable;return TETHER_ERROR_NO_ERROR;}}} finally {Binder.restoreCallingIdentity(ident);}return TETHER_ERROR_MASTER_ERROR;}private void sendTetherResult(ResultReceiver receiver, int result) {if (receiver != null) {receiver.send(result, null);}}

这里ResultReceiver 根据setWifiTethering的结果发送了一个 广播出去，暂时掐断不管，只看mgr.startSoftAp()；

WifiManager.java

    public boolean startSoftAp(@Nullable WifiConfiguration wifiConfig) {try {return mService.startSoftAp(wifiConfig);//Tethering.java传递的参数到这里是null} catch (RemoteException e) {throw e.rethrowFromSystemServer();}}

然后 BaseWifiService extends IWifiManager.Stub

WifiServiceImpl extends BaseWifiService，看WifiServiceImpl.java

    @Overridepublic boolean startSoftAp(WifiConfiguration wifiConfig) {mLog.info("startSoftAp Band:"+wifiConfig);// NETWORK_STACK is a signature only permission.enforceNetworkStackPermission();mLog.info("startSoftAp uid=%").c(Binder.getCallingUid()).flush();synchronized (mLocalOnlyHotspotRequests) {// If a tethering request comes in while we have an existing tethering session, return// error.if (mIfaceIpModes.contains(WifiManager.IFACE_IP_MODE_TETHERED)) {mLog.err("Tethering is already active.").flush();return false;}// If a tethering request comes in while we have LOHS running (or requested), call stop// for softap mode and restart softap with the tethering config.if (!isConcurrentLohsAndTetheringSupported() && !mLocalOnlyHotspotRequests.isEmpty()) {stopSoftApInternal(WifiManager.IFACE_IP_MODE_LOCAL_ONLY);}return startSoftApInternal(wifiConfig, WifiManager.IFACE_IP_MODE_TETHERED);}}private boolean startSoftApInternal(WifiConfiguration wifiConfig, int mode) {mLog.trace("startSoftApInternal uid=% mode=%").c(Binder.getCallingUid()).c(mode).flush();// null wifiConfig is a meaningful input for CMD_SET_APif (wifiConfig == null || WifiApConfigStore.validateApWifiConfiguration(wifiConfig)) {SoftApModeConfiguration softApConfig = new SoftApModeConfiguration(mode, wifiConfig);mWifiController.sendMessage(CMD_SET_AP, 1, 0, softApConfig);//看这里Slog.d(TAG,"softApConfig Band"+wifiConfig);return true;}Slog.e(TAG, "Invalid WifiConfiguration");return false;}

先看一下这个 Android学习 StateMachine与State模式，再看WifiController.java，WifiController extends StateMachine，看StateMachine.java的sendMessage()；

    @UnsupportedAppUsagepublic void sendMessage(int what, int arg1, int arg2, Object obj) {// mSmHandler can be null if the state machine has quit.SmHandler smh = mSmHandler;if (smh == null) return;smh.sendMessage(obtainMessage(what, arg1, arg2, obj));}

WifiController.java中，

class DefaultState extends State，

class DefaultState extends State，

class StaEnabledState extends State，

class StaDisabledWithScanState extends State，

都实现了processMessage()方法，所以看这里有对CMD_SET_AP的处理

         case CMD_SET_AP:// note: CMD_SET_AP is handled/dropped in ECM mode - will not start hereLog.d(TAG,"CMD_SET_AP enterSoftAPMode stopSoftAPMode msg.arg1:"+msg.arg1);if (msg.arg1 == 1) {SoftApModeConfiguration config = (SoftApModeConfiguration) msg.obj;mActiveModeWarden.enterSoftAPMode((SoftApModeConfiguration) msg.obj);} else {mActiveModeWarden.stopSoftAPMode(msg.arg2);}break;case CMD_SET_AP:Log.d(TAG,"CMD_SET_AP WIFI_DISABLED msg.arg1:"+msg.arg1);if (msg.arg1 == 1) {// remember that we were disabled, but pass the command up to start softapmSettingsStore.setWifiSavedState(WifiSettingsStore.WIFI_DISABLED);}return NOT_HANDLED;case CMD_SET_AP:Log.d(TAG,"CMD_SET_AP setWifiSavedState msg.arg1:"+msg.arg1);if (msg.arg1 == 1) {// remember that we were disabled, but pass the command up to start softapmSettingsStore.setWifiSavedState(WifiSettingsStore.WIFI_DISABLED);//这里关闭了wifi，待确认}return NOT_HANDLED;case CMD_SET_AP:Log.d(TAG,"CMD_SET_AP HANDLED");// do not want to start softap if we are in emergency modereturn HANDLED;

然后看mActiveModeWarden.enterSoftAPMode((SoftApModeConfiguration) msg.obj);

./opt/net/wifi/service/java/com/android/server/wifi/ActiveModeWarden.java

    public void enterSoftAPMode(@NonNull SoftApModeConfiguration wifiConfig) {mHandler.post(() -> {startSoftAp(wifiConfig);});}private void startSoftAp(SoftApModeConfiguration softapConfig) {Log.d(TAG, "Starting SoftApModeManager");WifiConfiguration config = softapConfig.getWifiConfiguration();//Log.d(TAG,"startSoftAp Band:"+config.apBand);if (config != null && config.SSID != null) {Log.d(TAG, "Passing config to SoftApManager! " + config);} else {config = null;}SoftApCallbackImpl callback = new SoftApCallbackImpl(softapConfig.getTargetMode());ActiveModeManager manager = mWifiInjector.makeSoftApManager(callback, softapConfig);callback.setActiveModeManager(manager);manager.start();mActiveModeManagers.add(manager);updateBatteryStatsWifiState(true);}

然后，重点来了！public class SoftApManager implements ActiveModeManager.java

    public void start() {mStateMachine.sendMessage(SoftApStateMachine.CMD_START, mApConfig);Log.d(TAG,"start() BAND:"+mApConfig.apBand);}

然后private class IdleState extends State

待续

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