在android中wifi打开的状态从DISABLED–>ENABLING–>ENABLED
1 WifiSettings.java–wifi界面wifi开关
wifi开关定义在SettingsActivity.java中，传入WifiEnabler.java，并在WifiEnabler.java中响应。
private SwitchBar mSwitchBar; public SwitchBar getSwitchBar() { return mSwitchBar; } mSwitchBar = (SwitchBar) findViewById(R.id.switch_bar); private SwitchBar mSwitchBar; public SwitchBar getSwitchBar() { return mSwitchBar; } mSwitchBar = (SwitchBar) findViewById(R.id.switch_bar);
2 WifiEnabler.java–响应点击wifi开关
WifiEnabler.java实际处理开关wifi的消息。
@Override public void onSwitchChanged(Switch switchView, boolean isChecked) {Log.d(TAG, "mWifiManager.setWifiEnabled");if (!mWifiManager.setWifiEnabled(isChecked)) {// ErrorLog.d(TAG, "set wifi enabled error");mSwitchBar.setEnabled(true);Toast.makeText(mContext, R.string.wifi_error, Toast.LENGTH_SHORT).show();}}3 WifiManager.java和WifiService.java
WifiEnabler.java调用WifiManager，WifiManager调用WifiService.
mService.setWifiEnabled(enabled); public synchronized boolean setWifiEnabled(boolean enable) {Slog.d(TAG, "setWifiEnabled: " + enable + " pid=" + Binder.getCallingPid()+ ", uid=" + Binder.getCallingUid());if (DBG) {Slog.e(TAG, "Invoking mWifiStateMachine.setWifiEnabled\n");}if (!mIsControllerStarted) {Slog.e(TAG,"WifiController is not yet started, abort setWifiEnabled");return false;}mWifiController.sendMessage(CMD_WIFI_TOGGLED);return true;}
4 WifiController.java
WifiController.java处理开关wifi 的消息CMD_WIFI_TOGGLED，从ApStaDisabledState–>StaEnabledState–>DeviceActiveState，
class ApStaDisabledState extends State { @Overridepublic boolean processMessage(Message msg) { switch (msg.what) { case CMD_WIFI_TOGGLED:case CMD_AIRPLANE_TOGGLED: if (mSettingsStore.isWifiToggleEnabled()) { if (doDeferEnable(msg)) { if (mHaveDeferredEnable) { // have 2 toggles now, inc serial number an ignore bothmDeferredEnableSerialNumber++;}mHaveDeferredEnable = !mHaveDeferredEnable;break;}if (mDeviceIdle == false) { transitionTo(mDeviceActiveState);} else {checkLocksAndTransitionWhenDeviceIdle();} } else if (mSettingsStore.isScanAlwaysAvailable()) { transitionTo(mStaDisabledWithScanState);}break; } class StaEnabledState extends State {@Overridepublic void enter() {mWifiStateMachine.setSupplicantRunning(true);} } 在进入StaEnabledState时由WifiStateMachine启动supplicant，，进入DeviceActiveState时启动driver。 /* Parent: StaEnabledState */ @Override mWifiStateMachine mWifiStateMachine mWifiStateMachine } } 5 WifiStateMachine.java
WIFI_STATE_ENABLED由SupplicantStartingState发出， CMD_START_SUPPLICANT–>startMonitoring–>WifiMonitor.SUP_CONNECTION_EVENT–>WifiManager.WIFI_STATE_ENABLED，到此wifi开关完全打开。
class InitialState extends State {@Overridepublic boolean processMessage(Message message) {switch (message.what) {case CMD_START_SUPPLICANT:if (mWifiNative.loadDriver()) {mNwService.wifiFirmwareReload(mInterfaceName, "STA");if(mWifiNative.startSupplicant(mP2pSupported)) {setWifiState(WIFI_STATE_ENABLING);mWifiMonitor.startMonitoring();transitionTo(mSupplicantStartingState);}}break;} } @Override setWifiState break;} }
6 SoftAP打开失败wifi不能打开原因分析
SoftAP打开过程：
WifiService的setWifiApEnabled–>WifiController的CDM_SET_AP–>WifiStateMachine的CMD_START_AP
class SoftApStartingState extends State {@Overridepublic void enter() {if (message.what == CMD_START_AP) {final WifiConfiguration config = (WifiConfiguration) message.obj;if (config == null) {mWifiApConfigChannel.sendMessage(CMD_REQUEST_AP_CONFIG);}}}@Overridepublic boolean processMessage(Message message) {switch(message.what) {case CMD_START_AP:deferMessage(message);break;case WifiStateMachine.CMD_RESPONSE_AP_CONFIG:WifiConfiguration config = (WifiConfiguration) message.obj;if (config != null) {startSoftApWithConfig(config);}break;case CMD_START_AP_FAILURE:setWifiApState(WIFI_AP_STATE_FAILED);transitionTo(mInitialState);break;}} }CMD_REQUEST_AP_CONFIG–>CMD_RESPONSE_AP_CONFIG–>startSoftApWithConfig–>CMD_START_FAILURE
由于WifiService没有收到WIFI_AP_START_FAILED，导致WifiController处于ApEnabledState，无法接收CMD_WIFI_TOGGLED消息，从而无法进入WifiStateMachie打开WIfi。
望着它们，我睡着了。今天已经过去——我生命中所有天中的一天，
