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.ja

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)) {

// Error

Log.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 {

@Override

public 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 both

mDeferredEnableSerialNumber++;

}

mHaveDeferredEnable = !mHaveDeferredEnable;

break;

}

if (mDeviceIdle == false) {

transitionTo(mDeviceActiveState);

} else {

checkLocksAndTransitionWhenDeviceIdle();

}

} else if (mSettingsStore.isScanAlwaysAvailable()) {

transitionTo(mStaDisabledWithScanState);

}

break;

}

class StaEnabledState extends State {

@Override

public void enter() {

mWifiStateMachine.setSupplicantRunning(true);

}

}

在进入StaEnabledState时由WifiStateMachine启动supplicant，，进入DeviceActiveState时启动driver。

/* Parent: StaEnabledState */@OverridemWifiStateMachinemWifiStateMachinemWifiStateMachine}}

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 {

@Override

public 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;

}

}

@OverridesetWifiStatebreak;

}

}

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 {

@Override

public void enter() {

if (message.what == CMD_START_AP) {

final WifiConfiguration config = (WifiConfiguration) message.obj;

if (config == null) {

mWifiApConfigChannel.sendMessage(CMD_REQUEST_AP_CONFIG);

}

}

}

@Override

public 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。