时序图:
wifi初始化.png
1. 系统启动wifiServer
系统服务都是开机启动,不去说init什么等c的孵化器流程,直接进入run说起
@frameworks/base/services/java/com/android/server/SystemServer.java
private static final String WIFI_SERVICE_CLASS =
"com.android.server.wifi.WifiService";
public static void main(String[] args) {
new SystemServer().run();
}
private void run() {
...
startOtherServices();
...
}
private void startOtherServices() {
...
if (!mOnlyCore) {
if (context.getPackageManager().hasSystemFeature(
PackageManager.FEATURE_WIFI)) {
// Wifi Service must be started first for wifi-related services.
traceBeginAndSlog("StartWifi");
mSystemServiceManager.startService(WIFI_SERVICE_CLASS);
traceEnd();
traceBeginAndSlog("StartWifiScanning");
mSystemServiceManager.startService(
"com.android.server.wifi.scanner.WifiScanningService");
traceEnd();
}
...
}
@frameworks/base/services/core/java/com/android/server/SystemServiceManager.java
public SystemService startService(String className) {
final Class serviceClass;
try {
serviceClass = (Class)Class.forName(className);
} catch (ClassNotFoundException ex) {
Slog.i(TAG, "Starting " + className);
throw new RuntimeException("Failed to create service " + className
+ ": service class not found, usually indicates that the caller should "
+ "have called PackageManager.hasSystemFeature() to check whether the "
+ "feature is available on this device before trying to start the "
+ "services that implement it", ex);
}
return startService(serviceClass);
}
public T startService(Class serviceClass) {
try {
final String name = serviceClass.getName();
Slog.i(TAG, "Starting " + name);
Trace.traceBegin(Trace.TRACE_TAG_SYSTEM_SERVER, "StartService " + name);
// Create the service.
if (!SystemService.class.isAssignableFrom(serviceClass)) {
throw new RuntimeException("Failed to create " + name
+ ": service must extend " + SystemService.class.getName());
}
final T service;
try {
Constructor constructor = serviceClass.getConstructor(Context.class);
service = constructor.newInstance(mContext);
} catch (InstantiationException ex) {
throw new RuntimeException("Failed to create service " + name
+ ": service could not be instantiated", ex);
} catch (IllegalAccessException ex) {
throw new RuntimeException("Failed to create service " + name
+ ": service must have a public constructor with a Context argument", ex);
} catch (NoSuchMethodException ex) {
throw new RuntimeException("Failed to create service " + name
+ ": service must have a public constructor with a Context argument", ex);
} catch (InvocationTargetException ex) {
throw new RuntimeException("Failed to create service " + name
+ ": service constructor threw an exception", ex);
}
startService(service);
return service;
} finally {
Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
}
}
public void startService(@NonNull final SystemService service) {
// Register it.
mServices.add(service);
// Start it.
long time = SystemClock.elapsedRealtime();
try {
service.onStart();
} catch (RuntimeException ex) {
throw new RuntimeException("Failed to start service " + service.getClass().getName()
+ ": onStart threw an exception", ex);
}
warnIfTooLong(SystemClock.elapsedRealtime() - time, service, "onStart");
}
2. WifiServer的初始化
SystemServiceManager启动了每个server 的onstart方法,开启了server的初始化
@frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiService.java
public WifiService(Context context) {
super(context);
mImpl = new WifiServiceImpl(context, new WifiInjector(context), new WifiAsyncChannel(TAG));
}
@Override
public void onStart() {
Log.i(TAG, "Registering " + Context.WIFI_SERVICE);
publishBinderService(Context.WIFI_SERVICE, mImpl);
}
@Override
public void onBootPhase(int phase) {
if (phase == SystemService.PHASE_SYSTEM_SERVICES_READY) {
mImpl.checkAndStartWifi();
}
}
@frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiServiceImpl.java
public void checkAndStartWifi() {
// First check if we will end up restarting WifiService
if (mFrameworkFacade.inStorageManagerCryptKeeperBounce()) {
Log.d(TAG, "Device still encrypted. Need to restart SystemServer. Do not start wifi.");
return;
}
// Check if wi-fi needs to be enabled
boolean wifiEnabled = mSettingsStore.isWifiToggleEnabled();
Slog.i(TAG, "WifiService starting up with Wi-Fi " +
(wifiEnabled ? "enabled" : "disabled"));
registerForScanModeChange();
mContext.registerReceiver(
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (mSettingsStore.handleAirplaneModeToggled()) {
mWifiController.sendMessage(CMD_AIRPLANE_TOGGLED);
}
if (mSettingsStore.isAirplaneModeOn()) {
Log.d(TAG, "resetting country code because Airplane mode is ON");
mCountryCode.airplaneModeEnabled();
}
}
},
new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED));
mContext.registerReceiver(
new com.mediatek.server.wifi.MtkEapSimUtility.MtkSimBroadcastReceiver(),
/*
@Override
public void onReceive(Context context, Intent intent) {
String state = intent.getStringExtra(IccCardConstants.INTENT_KEY_ICC_STATE);
if (IccCardConstants.INTENT_VALUE_ICC_ABSENT.equals(state)) {
Log.d(TAG, "resetting networks because SIM was removed");
mWifiStateMachine.resetSimAuthNetworks(false);
} else if (IccCardConstants.INTENT_VALUE_ICC_LOADED.equals(state)) {
Log.d(TAG, "resetting networks because SIM was loaded");
mWifiStateMachine.resetSimAuthNetworks(true);
}
}
}*/
new IntentFilter(TelephonyIntents.ACTION_SIM_STATE_CHANGED));
mContext.registerReceiver(
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final int currState = intent.getIntExtra(EXTRA_WIFI_AP_STATE,
WIFI_AP_STATE_DISABLED);
final int prevState = intent.getIntExtra(EXTRA_PREVIOUS_WIFI_AP_STATE,
WIFI_AP_STATE_DISABLED);
final int errorCode = intent.getIntExtra(EXTRA_WIFI_AP_FAILURE_REASON,
HOTSPOT_NO_ERROR);
final String ifaceName =
intent.getStringExtra(EXTRA_WIFI_AP_INTERFACE_NAME);
final int mode = intent.getIntExtra(EXTRA_WIFI_AP_MODE,
WifiManager.IFACE_IP_MODE_UNSPECIFIED);
handleWifiApStateChange(currState, prevState, errorCode, ifaceName, mode);
}
},
new IntentFilter(WifiManager.WIFI_AP_STATE_CHANGED_ACTION));
// Adding optimizations of only receiving broadcasts when wifi is enabled
// can result in race conditions when apps toggle wifi in the background
// without active user involvement. Always receive broadcasts.
registerForBroadcasts();
mInIdleMode = mPowerManager.isDeviceIdleMode();
if (!mWifiStateMachine.syncInitialize(mWifiStateMachineChannel)) {
Log.wtf(TAG, "Failed to initialize WifiStateMachine");
}
mWifiController.start();
// If we are already disabled (could be due to airplane mode), avoid changing persist
// state here
if (wifiEnabled) {
try {
setWifiEnabled(mContext.getPackageName(), wifiEnabled);
} catch (RemoteException e) {
/* ignore - local call */
}
}
}