systemserver探究笔记
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其实一开始本来打算写Activity启动的，后来发现自己老是弄不明白AMS与ActivityThread调用关系，于是再往上深究，发现是自己的基础没打好，缺少对Android整体的认知，所以才会知其然而不知其所以然。在讲system之前先上一张Android整体架构图。
分析的时候参考了http://quanminchaoren.iteye.com/blog/1252322不过它发布文章的版本大概还在Android2.2左右 ，源码可能会有一些出入
systemserver实际上不是一个server，源码中也可以看出
public final class SystemServer
当daivik虚拟机启动的时候，调用了
public static void main(String[] args) {
new SystemServer().run();
}
而在run方法完成了这么几件事
1.检查设备的时间是不是在1970以后，如果不是的话程序有可能crash掉
2.创建主Thread并循环looper
3.加载Android_server loadLibrary
4.初始化各种服务
5.初始化systemcontext
6.将systemcontext作为参数创建SystemServiceManager，并以键值对的形式存储到LocalServices
7.开启各种服务
源码如下
private void run() {
// If a device's clock is before 1970 (before 0), a lot of
// APIs crash dealing with negative numbers, notably
// java.io.File#setLastModified, so instead we fake it and
// hope that time from cell towers or NTP fixes it shortly.
//检查系统时间，要是在1970年之前，许多API会crash掉，所以我们希望程序一会通过信号塔或者NTP来修复它
if (System.currentTimeMillis() < EARLIEST_SUPPORTED_TIME) {
Slog.w(TAG, "System clock is before 1970; setting to 1970.");
SystemClock.setCurrentTimeMillis(EARLIEST_SUPPORTED_TIME);
}
// Here we go!
Slog.i(TAG, "Entered the Android system server!");
EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_SYSTEM_RUN, SystemClock.uptimeMillis());
// In case the runtime switched since last boot (such as when
// the old runtime was removed in an OTA), set the system
// property so that it is in sync. We can't do this in
// libnativehelper's JniInvocation::Init code where we already
// had to fallback to a different runtime because it is
// running as root and we need to be the system user to set
// the property. http://b/11463182
//万一runtime切换成上次启动，例如上次runtime因为OTA被删除了，我们需要设置一个系统属性以便于同步
//我们不能在一个回退到的runtime中初始化代码，因为它已经作为root运行了
SystemProperties.set("persist.sys.dalvik.vm.lib.2", VMRuntime.getRuntime().vmLibrary());
// Enable the sampling profiler.
if (SamplingProfilerIntegration.isEnabled()) {
SamplingProfilerIntegration.start();
mProfilerSnapshotTimer = new Timer();
mProfilerSnapshotTimer.schedule(new TimerTask() {
@Override
public void run() {
SamplingProfilerIntegration.writeSnapshot("system_server", null);
}
}, SNAPSHOT_INTERVAL, SNAPSHOT_INTERVAL);
}
// Mmmmmm... more memory!
VMRuntime.getRuntime().clearGrowthLimit();
// The system server has to run all of the time, so it needs to be
// as efficient as possible with its memory usage.
//系统system server必须一直运行，所以它需要尽可能的高效使用内存
VMRuntime.getRuntime().setTargetHeapUtilization(0.8f);
// Some devices rely on runtime fingerprint generation, so make sure
// we've defined it before booting further.
//一些设备依赖runtime指纹生成，所以我们应该确保在启动之前就定义了它
Build.ensureFingerprintProperty();
// Within the system server, it is an error to access Environment paths without
// explicitly specifying a user.
//在system server中，隐式确定的用户访问环境路径是错误的
Environment.setUserRequired(true);
// Ensure binder calls into the system always run at foreground priority.
//确保binder与system通信时总是以前台优先级运行
BinderInternal.disableBackgroundScheduling(true);
// Prepare the main looper thread (this thread).
android.os.Process.setThreadPriority(
android.os.Process.THREAD_PRIORITY_FOREGROUND);
android.os.Process.setCanSelfBackground(false);
Looper.prepareMainLooper();
// Initialize native services.
System.loadLibrary("android_servers");
nativeInit();
// Check whether we failed to shut down last time we tried.
// This call may not return.
performPendingShutdown();
// Initialize the system context.
//初始化了systemcontext，通过ActivityThr
ead创建
createSystemContext();
// Create the system service manager.
mSystemServiceManager = new SystemServiceManager(mSystemContext);
//将mSystemServiceManager存储到数组中，通过键值对指定mSystemServiceManager为SystemServiceManager
LocalServices.addService(SystemServiceManager.class, mSystemServiceManager);
// Start services.
try {
startBootstrapServices();
startCoreServices();
startOtherServices();
} catch (Throwable ex) {
Slog.e("System", "******************************************");
Slog.e("System", "************ Failure starting system services", ex);
throw ex;
}
// For debug builds, log event loop stalls to dropbox for analysis.
if (StrictMode.conditionallyEnableDebugLogging()) {
Slog.i(TAG, "Enabled StrictMode for system server main thread.");
}
// Loop forever.
Looper.loop();
throw new RuntimeException("Main thread loop unexpectedly exited");
}
初始化各种服务调用的是nativeInit();方法涉及到native层的实现，我们只需要知道它初始化了什么服务就好
接下来，让我们看看startBootstrapServices();startCoreServices();startOtherServices();这三个函数分别干了什么
startBootstrapServices();
/**
* Starts the small tangle of critical services that are needed to get
* the system off the ground. These services have complex mutual dependencies
* which is why we initialize them all in one place here. Unless your service
* is also entwined in these dependencies, it should be initialized in one of
* the other functions.
*/
private void startBootstrapServices() {
// Wait for installd to finish starting up so that it has a chance to
// create critical directories such as /data/user with the appropriate
// permissions. We need this to complete before we initialize other services.
Installer installer = mSystemServiceManager.startService(Installer.class);
// Activity manager runs the show.
mActivityManagerService = mSystemServiceManager.startService(
ActivityManagerService.Lifecycle.class).getService();
mActivityManagerService.setSystemServiceManager(mSystemServiceManager);
mActivityManagerService.setInstaller(installer);
// Power manager needs to be started early because other services need it.
// Native daemons may be watching for it to be registered so it must be ready
// to handle incoming binder calls immediately (including being able to verify
// the permissions for those calls).
mPowerManagerService = mSystemServiceManager.startService(PowerManagerService.class);
// Now that the power manager has been started, let the activity manager
// initialize power management features.
mActivityManagerService.initPowerManagement();
// Display manager is needed to provide display metrics before package manager
// starts up.
mDisplayManagerService = mSystemServiceManager.startService(DisplayManagerService.class);
// We need the default display before we can initialize the package manager.
mSystemServiceManager.startBootPhase(SystemService.PHASE_WAIT_FOR_DEFAULT_DISPLAY);
// Only run "core" apps if we're encrypting the device.
String cryptState = SystemProperties.get("vold.decrypt");
if (ENCRYPTING_STATE.equals(cryptState)) {
Slog.w(TAG, "Detected encryption in progress - only parsing core apps");
mOnlyCore = true;
} else if (ENCRYPTED_STATE.equals(cryptState)) {
Slog.w(TAG, "Device encrypted - only parsing core apps");
mOnlyCore = true;
}
// Start the package manager.
Slog.i(TAG, "Package Manager");
mPackageManagerService = PackageManagerService.main(mSystemContext, installer,
mFactoryTestMode != FactoryTest.FACTORY_TEST_OFF, mOnlyCore);
mFirstBoot = mPackageManagerService.isFirstBoot();
mPackageManager = mSystemContext.getPackageManager();
Slog.i(TAG, "User Service");
ServiceManager.addService(Context.USER_SERVICE, UserManagerService.getInstance());
// Initialize attribute cache used to cache resources from packages.
AttributeCache.init(mSystemContext);
// Set up the Application instance for the system process and get started.
mActivityManagerService.setSystemProcess();
}
代码这么多，我总结了一下
1.创建了AMS并启动它，关于它的启动采用了JAVA的反射机制。源码如下
mActivityManagerService = mSystemServiceManager.startService( ActivityManagerService.Lifecycle.class).getService(); mActivityManagerService.setSystemServiceManager(mSystemServiceManager); mActivityManagerService.setInstaller(installer);startServer中通过反射机制拿到ActivityManagerService.Lifecycle的实例
public static final class Lifecycle extends SystemService { private final ActivityManagerService mService; public Lifecycle(Context context) { super(context); mService = new ActivityManagerService(context); } @Override public void onStart() { mService.start(); } public ActivityManagerService getService() { return mService; } }再通过getService拿到AMS，而构造AMS所传入的context就是构造mSystemServiceManager所用的context2.开启其他服务，例如PMS，调用了PMS.main方法
3.为系统进程创建APP实例并启动
startCoreServices();
这个没什么好说的，开启一些必要服务，灯光电池什么的
/**
* Starts some essential services that are not tangled up in the bootstrap process.
*/
private void startCoreServices() {
// Manages LEDs and display backlight.
mSystemServiceManager.startService(LightsService.class);
// Tracks the battery level. Requires LightService.
mSystemServiceManager.startService(BatteryService.class);
// Tracks application usage stats.
mSystemServiceManager.startService(UsageStatsService.class);
mActivityManagerService.setUsageStatsManager(
LocalServices.getService(UsageStatsManagerInternal.class));
// Update after UsageStatsService is available, needed before performBootDexOpt.
mPackageManagerService.getUsageStatsIfNoPackageUsageInfo();
// Tracks whether the updatable WebView is in a ready state and watches for update installs.
mSystemServiceManager.startService(WebViewUpdateService.class);
}
startOtherServices();
/**
* Starts a miscellaneous grab bag of stuff that has yet to be refactored
* and organized.
*/
private void startOtherServices() {
final Context context = mSystemContext;
AccountManagerService accountManager = null;
ContentService contentService = null;
VibratorService vibrator = null;
IAlarmManager alarm = null;
MountService mountService = null;
NetworkManagementService networkManagement = null;
NetworkStatsService networkStats = null;
NetworkPolicyManagerService networkPolicy = null;
ConnectivityService connectivity = null;
NetworkScoreService networkScore = null;
NsdService serviceDiscovery= null;
WindowManagerService wm = null;
BluetoothManagerService bluetooth = null;
UsbService usb = null;
SerialService serial = null;
NetworkTimeUpdateService networkTimeUpdater = null;
CommonTimeManagementService commonTimeMgmtService = null;
InputManagerService inputManager = null;
TelephonyRegistry telephonyRegistry = null;
ConsumerIrService consumerIr = null;
AudioService audioService = null;
MmsServiceBroker mmsService = null;
boolean disableStorage = SystemProperties.getBoolean("config.disable_storage", false);
boolean disableMedia = SystemProperties.getBoolean("config.disable_media", false);
boolean disableBluetooth = SystemProperties.getBoolean("config.disable_bluetooth", false);
boolean disableTelephony = SystemProperties.getBoolean("config.disable_telephony", false);
boolean disableLocation = SystemProperties.getBoolean("config.disable_location", false);
boolean disableSystemUI = SystemProperties.getBoolean("config.disable_systemui", false);
boolean disableNonCoreServices = SystemProperties.getBoolean("config.disable_noncore", false);
boolean disableNetwork = SystemProperties.getBoolean("config.disable_network", false);
boolean disableNetworkTime = SystemProperties.getBoolean("config.disable_networktime", false);
boolean isEmulator = SystemProperties.get("ro.kernel.qemu").equals("1");
boolean digitalPenCapable =
Resources.getSystem().getBoolean(com.android.internal.R.bool.config_digitalPenCapable);
boolean disableAtlas = SystemProperties.getBoolean("config.disable_atlas", false);
String[] externalServices = Resources.getSystem()
.getStringArray(com.android.internal.R.array.config_externalCMServices);
try {
Slog.i(TAG, "Reading configuration...");
SystemConfig.getInstance();
Slog.i(TAG, "Scheduling Policy");
ServiceManager.addService("scheduling_policy", new SchedulingPolicyService());
mSystemServiceManager.startService(TelecomLoaderService.class);
Slog.i(TAG, "Telephony Registry");
telephonyRegistry = new TelephonyRegistry(context);
ServiceManager.addService("telephony.registry", telephonyRegistry);
Slog.i(TAG, "Entropy Mixer");
ServiceManager.addService("entropy", new EntropyMixer(context));
mContentResolver = context.getContentResolver();
// The AccountManager must come before the ContentService
try {
// TODO: seems like this should be disable-able, but req'd by ContentService
Slog.i(TAG, "Account Manager");
accountManager = new AccountManagerService(context);
ServiceManager.addService(Context.ACCOUNT_SERVICE, accountManager);
} catch (Throwable e) {
Slog.e(TAG, "Failure starting Account Manager", e);
}
Slog.i(TAG, "Content Manager");
contentService = ContentService.main(context,
mFactoryTestMode == FactoryTest.FACTORY_TEST_LOW_LEVEL);
Slog.i(TAG, "System Content Providers");
mActivityManagerService.installSystemProviders();
Slog.i(TAG, "Vibrator Service");
vibrator = new VibratorService(context);
ServiceManager.addService("vibrator", vibrator);
Slog.i(TAG, "Consumer IR Service");
consumerIr = new ConsumerIrService(context);
ServiceManager.addService(Context.CONSUMER_IR_SERVICE, consumerIr);
mAlarmManagerService = mSystemServiceManager.startService(AlarmManagerService.class);
alarm = IAlarmManager.Stub.asInterface(
ServiceManager.getService(Context.ALARM_SERVICE));
Slog.i(TAG, "Init Watchdog");
final Watchdog watchdog = Watchdog.getInstance();
watchdog.init(context, mActivityManagerService);
Slog.i(TAG, "Input Manager");
inputManager = new InputManagerService(context);
Slog.i(TAG, "Window Manager");
wm = WindowManagerService.main(context, inputManager,
mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL,
true, mOnlyCore);
ServiceManager.addService(Context.WINDOW_SERVICE, wm);
ServiceManager.addService(Context.INPUT_SERVICE, inputManager);
mActivityManagerService.setWindowManager(wm);
inputManager.setWindowManagerCallbacks(wm.getInputMonitor());
inputManager.start();
// TODO: Use service dependencies instead.
mDisplayManagerService.windowManagerAndInputReady();
// Skip Bluetooth if we have an emulator kernel
// TODO: Use a more reliable check to see if this product should
// support Bluetooth - see bug 988521
if (isEmulator) {
Slog.i(TAG, "No Bluetooh Service (emulator)");
} else if (mFactoryTestMode == FactoryTest.FACTORY_TEST_LOW_LEVEL) {
Slog.i(TAG, "No Bluetooth Service (factory test)");
} else if (!context.getPackageManager().hasSystemFeature
(PackageManager.FEATURE_BLUETOOTH)) {
Slog.i(TAG, "No Bluetooth Service (Bluetooth Hardware Not Present)");
} else if (disableBluetooth) {
Slog.i(TAG, "Bluetooth Service disabled by config");
} else {
Slog.i(TAG, "Bluetooth Manager Service");
bluetooth = new BluetoothManagerService(context);
ServiceManager.addService(BluetoothAdapter.BLUETOOTH_MANAGER_SERVICE, bluetooth);
}
} catch (RuntimeException e) {
Slog.e("System", "******************************************");
Slog.e("System", "************ Failure starting core service", e);
}
StatusBarManagerService statusBar = null;
INotificationManager notification = null;
InputMethodManagerService imm = null;
WallpaperManagerService wallpaper = null;
LocationManagerService location = null;
CountryDetectorService countryDetector = null;
TextServicesManagerService tsms = null;
LockSettingsService lockSettings = null;
AssetAtlasService atlas = null;
MediaRouterService mediaRouter = null;
EdgeGestureService edgeGestureService = null;
GestureService gestureService = null;
ThemeService themeService = null;
KillSwitchService killSwitchService = null;
// Bring up services needed for UI.
if (mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL) {
//if (!disableNonCoreServices) { // TODO: View depends on these; mock them?
if (true) {
try {
Slog.i(TAG, "Input Method Service");
imm = new InputMethodManagerService(context, wm);
ServiceManager.addService(Context.INPUT_METHOD_SERVICE, imm);
} catch (Throwable e) {
reportWtf("starting Input Manager Service", e);
}
try {
Slog.i(TAG, "Accessibility Manager");
ServiceManager.addService(Context.ACCESSIBILITY_SERVICE,
new AccessibilityManagerService(context));
} catch (Throwable e) {
reportWtf("starting Accessibility Manager", e);
}
}
}
try {
wm.displayReady();
} catch (Throwable e) {
reportWtf("making display ready", e);
}
if (mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL) {
if (!disableStorage &&
!"0".equals(SystemProperties.get("system_init.startmountservice"))) {
try {
/*
* NotificationManagerService is dependant on MountService,
* (for media / usb notifications) so we must start MountService first.
*/
Slog.i(TAG, "Mount Service");
mountService = new MountService(context);
ServiceManager.addService("mount", mountService);
} catch (Throwable e) {
reportWtf("starting Mount Service", e);
}
}
}
try {
mPackageManagerService.performBootDexOpt();
} catch (Throwable e) {
reportWtf("performing boot dexopt", e);
}
try {
ActivityManagerNative.getDefault().showBootMessage(
context.getResources().getText(
com.android.internal.R.string.android_upgrading_starting_apps),
false);
} catch (RemoteException e) {
}
if (mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL) {
if (!disableNonCoreServices) {
try {
Slog.i(TAG, "LockSettingsService");
lockSettings = new LockSettingsService(context);
ServiceManager.addService("lock_settings", lockSettings);
} catch (Throwable e) {
reportWtf("starting LockSettingsService service", e);
}
if (!SystemProperties.get(PERSISTENT_DATA_BLOCK_PROP).equals("")) {
mSystemServiceManager.startService(PersistentDataBlockService.class);
}
// Always start the Device Policy Manager, so that the API is compatible with
// API8.
mSystemServiceManager.startService(DevicePolicyManagerService.Lifecycle.class);
}
if (!disableSystemUI) {
try {
Slog.i(TAG, "Status Bar");
statusBar = new StatusBarManagerService(context, wm);
ServiceManager.addService(Context.STATUS_BAR_SERVICE, statusBar);
} catch (Throwable e) {
reportWtf("starting StatusBarManagerService", e);
}
}
if (!disableNonCoreServices) {
try {
Slog.i(TAG, "Clipboard Service");
ServiceManager.addService(Context.CLIPBOARD_SERVICE,
new ClipboardService(context));
} catch (Throwable e) {
reportWtf("starting Clipboard Service", e);
}
}
if (!disableNonCoreServices &&
mPackageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {
try {
Slog.i(TAG, "TorchService");
ServiceManager.addService(Context.TORCH_SERVICE, new TorchService(context));
} catch (Throwable e) {
reportWtf("starting Torch Service", e);
}
}
if (!disableNetwork) {
try {
Slog.i(TAG, "NetworkManagement Service");
networkManagement = NetworkManagementService.create(context);
ServiceManager.addService(Context.NETWORKMANAGEMENT_SERVICE, networkManagement);
} catch (Throwable e) {
reportWtf("starting NetworkManagement Service", e);
}
}
if (!disableNonCoreServices) {
try {
Slog.i(TAG, "Text Service Manager Service");
tsms = new TextServicesManagerService(context);
ServiceManager.addService(Context.TEXT_SERVICES_MANAGER_SERVICE, tsms);
} catch (Throwable e) {
reportWtf("starting Text Service Manager Service", e);
}
}
if (!disableNetwork) {
try {
Slog.i(TAG, "Network Score Service");
networkScore = new NetworkScoreService(context);
ServiceManager.addService(Context.NETWORK_SCORE_SERVICE, networkScore);
} catch (Throwable e) {
reportWtf("starting Network Score Service", e);
}
try {
Slog.i(TAG, "NetworkStats Service");
networkStats = new NetworkStatsService(context, networkManagement, alarm);
ServiceManager.addService(Context.NETWORK_STATS_SERVICE, networkStats);
} catch (Throwable e) {
reportWtf("starting NetworkStats Service", e);
}
try {
Slog.i(TAG, "NetworkPolicy Service");
networkPolicy = new NetworkPolicyManagerService(
context, mActivityManagerService,
(IPowerManager)ServiceManager.getService(Context.POWER_SERVICE),
networkStats, networkManagement);
ServiceManager.addService(Context.NETWORK_POLICY_SERVICE, networkPolicy);
} catch (Throwable e) {
reportWtf("starting NetworkPolicy Service", e);
}
mSystemServiceManager.startService(WIFI_P2P_SERVICE_CLASS);
mSystemServiceManager.startService(WIFI_SERVICE_CLASS);
mSystemServiceManager.startService(
"com.android.server.wifi.WifiScanningService");
mSystemServiceManager.startService("com.android.server.wifi.RttService");
if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_ETHERNET)) {
mSystemServiceManager.startService(ETHERNET_SERVICE_CLASS);
}
try {
Slog.i(TAG, "Connectivity Service");
connectivity = new ConnectivityService(
context, networkManagement, networkStats, networkPolicy);
ServiceManager.addService(Context.CONNECTIVITY_SERVICE, connectivity);
networkStats.bindConnectivityManager(connectivity);
networkPolicy.bindConnectivityManager(connectivity);
} catch (Throwable e) {
reportWtf("starting Connectivity Service", e);
}
try {
Slog.i(TAG, "Network Service Discovery Service");
serviceDiscovery = NsdService.create(context);
ServiceManager.addService(
Context.NSD_SERVICE, serviceDiscovery);
} catch (Throwable e) {
reportWtf("starting Service Discovery Service", e);
}
try {
Slog.i(TAG, "DPM Service");
startDpmService(context);
} catch (Throwable e) {
reportWtf("starting DpmService", e);
}
}
if (!disableNonCoreServices) {
try {
Slog.i(TAG, "UpdateLock Service");
ServiceManager.addService(Context.UPDATE_LOCK_SERVICE,
new UpdateLockService(context));
} catch (Throwable e) {
reportWtf("starting UpdateLockService", e);
}
}
/*
* MountService has a few dependencies: Notification Manager and
* AppWidget Provider. Make sure MountService is completely started
* first before continuing.
*/
if (mountService != null && !mOnlyCore) {
mountService.waitForAsecScan();
}
try {
if (accountManager != null)
accountManager.systemReady();
} catch (Throwable e) {
reportWtf("making Account Manager Service ready", e);
}
try {
if (contentService != null)
contentService.systemReady();
} catch (Throwable e) {
reportWtf("making Content Service ready", e);
}
mSystemServiceManager.startService(NotificationManagerService.class);
notification = INotificationManager.Stub.asInterface(
ServiceManager.getService(Context.NOTIFICATION_SERVICE));
networkPolicy.bindNotificationManager(notification);
mSystemServiceManager.startService(DeviceStorageMonitorService.class);
if (!disableLocation) {
try {
Slog.i(TAG, "Location Manager");
location = new LocationManagerService(context);
ServiceManager.addService(Context.LOCATION_SERVICE, location);
} catch (Throwable e) {
reportWtf("starting Location Manager", e);
}
try {
Slog.i(TAG, "Country Detector");
countryDetector = new CountryDetectorService(context);
ServiceManager.addService(Context.COUNTRY_DETECTOR, countryDetector);
} catch (Throwable e) {
reportWtf("starting Country Detector", e);
}
}
if (!disableNonCoreServices) {
try {
Slog.i(TAG, "Search Service");
ServiceManager.addService(Context.SEARCH_SERVICE,
new SearchManagerService(context));
} catch (Throwable e) {
reportWtf("starting Search Service", e);
}
}
try {
Slog.i(TAG, "DropBox Service");
ServiceManager.addService(Context.DROPBOX_SERVICE,
new DropBoxManagerService(context, new File("/data/system/dropbox")));
} catch (Throwable e) {
reportWtf("starting DropBoxManagerService", e);
}
if (!disableNonCoreServices && context.getResources().getBoolean(
R.bool.config_enableWallpaperService)) {
try {
Slog.i(TAG, "Wallpaper Service");
wallpaper = new WallpaperManagerService(context);
ServiceManager.addService(Context.WALLPAPER_SERVICE, wallpaper);
} catch (Throwable e) {
reportWtf("starting Wallpaper Service", e);
}
}
if (!disableMedia && !"0".equals(SystemProperties.get("system_init.startaudioservice"))) {
try {
Slog.i(TAG, "Audio Service");
audioService = new AudioService(context);
ServiceManager.addService(Context.AUDIO_SERVICE, audioService);
} catch (Throwable e) {
reportWtf("starting Audio Service", e);
}
}
if (!disableNonCoreServices) {
mSystemServiceManager.startService(DockObserver.class);
}
if (!disableMedia) {
try {
Slog.i(TAG, "Wired Accessory Manager");
// Listen for wired headset changes
inputManager.setWiredAccessoryCallbacks(
new WiredAccessoryManager(context, inputManager));
} catch (Throwable e) {
reportWtf("starting WiredAccessoryManager", e);
}
}
if (!disableNonCoreServices) {
if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_USB_HOST)
|| mPackageManager.hasSystemFeature(
PackageManager.FEATURE_USB_ACCESSORY)) {
// Manage USB host and device support
mSystemServiceManager.startService(USB_SERVICE_CLASS);
}
try {
Slog.i(TAG, "Serial Service");
// Serial port support
serial = new SerialService(context);
ServiceManager.addService(Context.SERIAL_SERVICE, serial);
} catch (Throwable e) {
Slog.e(TAG, "Failure starting SerialService", e);
}
}
mSystemServiceManager.startService(TwilightService.class);
mSystemServiceManager.startService(UiModeManagerService.class);
mSystemServiceManager.startService(JobSchedulerService.class);
if (!disableNonCoreServices) {
if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_BACKUP)) {
mSystemServiceManager.startService(BACKUP_MANAGER_SERVICE_CLASS);
}
if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_APP_WIDGETS)) {
mSystemServiceManager.startService(APPWIDGET_SERVICE_CLASS);
}
if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_VOICE_RECOGNIZERS)) {
mSystemServiceManager.startService(VOICE_RECOGNITION_MANAGER_SERVICE_CLASS);
}
}
try {
Slog.i(TAG, "DiskStats Service");
ServiceManager.addService("diskstats", new DiskStatsService(context));
} catch (Throwable e) {
reportWtf("starting DiskStats Service", e);
}
try {
// need to add this service even if SamplingProfilerIntegration.isEnabled()
// is false, because it is this service that detects system property change and
// turns on SamplingProfilerIntegration. Plus, when sampling profiler doesn't work,
// there is little overhead for running this service.
Slog.i(TAG, "SamplingProfiler Service");
ServiceManager.addService("samplingprofiler",
new SamplingProfilerService(context));
} catch (Throwable e) {
reportWtf("starting SamplingProfiler Service", e);
}
if (!disableNetwork && !disableNetworkTime) {
try {
Slog.i(TAG, "NetworkTimeUpdateService");
networkTimeUpdater = new NetworkTimeUpdateService(context);
} catch (Throwable e) {
reportWtf("starting NetworkTimeUpdate service", e);
}
}
if (!disableMedia) {
try {
Slog.i(TAG, "CommonTimeManagementService");
commonTimeMgmtService = new CommonTimeManagementService(context);
ServiceManager.addService("commontime_management", commonTimeMgmtService);
} catch (Throwable e) {
reportWtf("starting CommonTimeManagementService service", e);
}
}
if (!disableNetwork) {
try {
Slog.i(TAG, "CertBlacklister");
CertBlacklister blacklister = new CertBlacklister(context);
} catch (Throwable e) {
reportWtf("starting CertBlacklister", e);
}
}
if (!disableNonCoreServices) {
// Dreams (interactive idle-time views, a/k/a screen savers, and doze mode)
mSystemServiceManager.startService(DreamManagerService.class);
}
if (!disableNonCoreServices && !disableAtlas) {
try {
Slog.i(TAG, "Assets Atlas Service");
atlas = new AssetAtlasService(context);
ServiceManager.addService(AssetAtlasService.ASSET_ATLAS_SERVICE, atlas);
} catch (Throwable e) {
reportWtf("starting AssetAtlasService", e);
}
}
if (context.getResources().getBoolean(
com.android.internal.R.bool.config_enableGestureService)) {
try {
Slog.i(TAG, "Gesture Sensor Service");
gestureService = new GestureService(context, inputManager);
ServiceManager.addService("gesture", gestureService);
} catch (Throwable e) {
Slog.e(TAG, "Failure starting Gesture Sensor Service", e);
}
}
if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_PRINTING)) {
mSystemServiceManager.startService(PRINT_MANAGER_SERVICE_CLASS);
}
mSystemServiceManager.startService(RestrictionsManagerService.class);
mSystemServiceManager.startService(MediaSessionService.class);
if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_HDMI_CEC)) {
mSystemServiceManager.startService(HdmiControlService.class);
}
if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_LIVE_TV)) {
mSystemServiceManager.startService(TvInputManagerService.class);
}
if (!disableNonCoreServices && !mOnlyCore) {
try {
Slog.i(TAG, "Theme Service");
themeService = new ThemeService(context);
ServiceManager.addService(Context.THEME_SERVICE, themeService);
} catch (Throwable e) {
reportWtf("starting Theme Service", e);
}
}
try {
Slog.i(TAG, "KillSwitch Service");
killSwitchService = new KillSwitchService(context);
ServiceManager.addService(Context.KILLSWITCH_SERVICE, killSwitchService);
} catch (Throwable e) {
reportWtf("starting KillSwitch Service", e);
}
if (!disableNonCoreServices) {
try {
Slog.i(TAG, "Media Router Service");
mediaRouter = new MediaRouterService(context);
ServiceManager.addService(Context.MEDIA_ROUTER_SERVICE, mediaRouter);
} catch (Throwable e) {
reportWtf("starting MediaRouterService", e);
}
mSystemServiceManager.startService(TrustManagerService.class);
mSystemServiceManager.startService(FingerprintService.class);
try {
Slog.i(TAG, "BackgroundDexOptService");
BackgroundDexOptService.schedule(context);
} catch (Throwable e) {
reportWtf("starting BackgroundDexOptService", e);
}
}
mSystemServiceManager.startService(LauncherAppsService.class);
boolean isWipowerEnabled = SystemProperties.getBoolean("ro.bluetooth.wipower", false);
if (isWipowerEnabled) {
try {
final String WBC_SERVICE_NAME = "wbc_service";
Slog.i(TAG, "WipowerBatteryControl Service");
PathClassLoader wbcClassLoader =
new PathClassLoader("/system/framework/com.quicinc.wbc.jar:/system/framework/com.quicinc.wbcservice.jar",
ClassLoader.getSystemClassLoader());
Class wbcClass = wbcClassLoader.loadClass("com.quicinc.wbcservice.WbcService");
Constructor<Class> ctor = wbcClass.getConstructor(Context.class);
Object wbcObject = ctor.newInstance(context);
Slog.d(TAG, "Successfully loaded WbcService class");
ServiceManager.addService(WBC_SERVICE_NAME, (IBinder) wbcObject);
} catch (Throwable e) {
reportWtf("starting WipowerBatteryControl Service", e);
}
} else {
Slog.d(TAG, "Wipower not supported");
}
if (digitalPenCapable) {
try {
Slog.i(TAG, "Digital Pen Service");
PathClassLoader digitalPenClassLoader =
new PathClassLoader("/system/framework/DigitalPenService.jar",
ClassLoader.getSystemClassLoader());
Class digitalPenClass = digitalPenClassLoader.loadClass
("com.qti.snapdragon.digitalpen.DigitalPenService");
Constructor<Class> ctor = digitalPenClass.getConstructor(Context.class);
Object digitalPenRemoteObject = ctor.newInstance(context);
Slog.i(TAG, "Successfully loaded DigitalPenService class");
ServiceManager.addService("DigitalPen", (IBinder)digitalPenRemoteObject);
} catch (Throwable e) {
reportWtf("starting DigitalPenService", e);
}
}
try {
Slog.i(TAG, "EdgeGesture service");
edgeGestureService = new EdgeGestureService(context, inputManager);
ServiceManager.addService("edgegestureservice", edgeGestureService);
} catch (Throwable e) {
Slog.e(TAG, "Failure starting EdgeGesture service", e);
}
}
if (!disableNonCoreServices) {
mSystemServiceManager.startService(MediaProjectionManagerService.class);
}
// make sure the ADB_ENABLED setting value matches the secure property value
Settings.Secure.putInt(mContentResolver, Settings.Secure.ADB_PORT,
Integer.parseInt(SystemProperties.get("service.adb.tcp.port", "-1")));
// register observer to listen for settings changes
mContentResolver.registerContentObserver(
Settings.Secure.getUriFor(Settings.Secure.ADB_PORT),
false, new AdbPortObserver());
// Before things start rolling, be sure we have decided whether
// we are in safe mode.
final boolean safeMode = wm.detectSafeMode();
if (safeMode) {
mActivityManagerService.enterSafeMode();
// Disable the JIT for the system_server process
VMRuntime.getRuntime().disableJitCompilation();
} else {
// Enable the JIT for the system_server process
VMRuntime.getRuntime().startJitCompilation();
}
// MMS service broker
mmsService = mSystemServiceManager.startService(MmsServiceBroker.class);
// Externally-defined services
for (String service : externalServices) {
try {
Slog.i(TAG, service);
mSystemServiceManager.startService(service);
} catch (Throwable e) {
reportWtf("starting " + service , e);
}
}
// It is now time to start up the app processes...
try {
vibrator.systemReady();
} catch (Throwable e) {
reportWtf("making Vibrator Service ready", e);
}
if (lockSettings != null) {
try {
lockSettings.systemReady();
} catch (Throwable e) {
reportWtf("making Lock Settings Service ready", e);
}
}
// Needed by DevicePolicyManager for initialization
mSystemServiceManager.startBootPhase(SystemService.PHASE_LOCK_SETTINGS_READY);
mSystemServiceManager.startBootPhase(SystemService.PHASE_SYSTEM_SERVICES_READY);
try {
wm.systemReady();
} catch (Throwable e) {
reportWtf("making Window Manager Service ready", e);
}
if (safeMode) {
mActivityManagerService.showSafeModeOverlay();
}
// Update the configuration for this context by hand, because we're going
// to start using it before the config change done in wm.systemReady() will
// propagate to it.
Configuration config = wm.computeNewConfiguration();
DisplayMetrics metrics = new DisplayMetrics();
WindowManager w = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
w.getDefaultDisplay().getMetrics(metrics);
context.getResources().updateConfiguration(config, metrics);
try {
// TODO: use boot phase
mPowerManagerService.systemReady(mActivityManagerService.getAppOpsService());
} catch (Throwable e) {
reportWtf("making Power Manager Service ready", e);
}
try {
mPackageManagerService.systemReady();
} catch (Throwable e) {
reportWtf("making Package Manager Service ready", e);
}
try {
// TODO: use boot phase and communicate these flags some other way
mDisplayManagerService.systemReady(safeMode, mOnlyCore);
} catch (Throwable e) {
reportWtf("making Display Manager Service ready", e);
}
if (edgeGestureService != null) {
try {
edgeGestureService.systemReady();
} catch (Throwable e) {
reportWtf("making EdgeGesture service ready", e);
}
}
if (gestureService != null) {
try {
gestureService.systemReady();
} catch (Throwable e) {
reportWtf("making Gesture Sensor Service ready", e);
}
}
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_APP_FAILURE);
filter.addAction(Intent.ACTION_APP_FAILURE_RESET);
filter.addAction(Intent.ACTION_PACKAGE_ADDED);
filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
filter.addAction(ThemeUtils.ACTION_THEME_CHANGED);
filter.addCategory(Intent.CATEGORY_THEME_PACKAGE_INSTALLED_STATE_CHANGE);
filter.addDataScheme("package");
context.registerReceiver(new AppsFailureReceiver(), filter);
// These are needed to propagate to the runnable below.
final MountService mountServiceF = mountService;
final NetworkManagementService networkManagementF = networkManagement;
final NetworkStatsService networkStatsF = networkStats;
final NetworkPolicyManagerService networkPolicyF = networkPolicy;
final ConnectivityService connectivityF = connectivity;
final NetworkScoreService networkScoreF = networkScore;
final WallpaperManagerService wallpaperF = wallpaper;
final InputMethodManagerService immF = imm;
final LocationManagerService locationF = location;
final CountryDetectorService countryDetectorF = countryDetector;
final NetworkTimeUpdateService networkTimeUpdaterF = networkTimeUpdater;
final CommonTimeManagementService commonTimeMgmtServiceF = commonTimeMgmtService;
final TextServicesManagerService textServiceManagerServiceF = tsms;
final StatusBarManagerService statusBarF = statusBar;
final AssetAtlasService atlasF = atlas;
final InputManagerService inputManagerF = inputManager;
final TelephonyRegistry telephonyRegistryF = telephonyRegistry;
final MediaRouterService mediaRouterF = mediaRouter;
final AudioService audioServiceF = audioService;
final MmsServiceBroker mmsServiceF = mmsService;
final ThemeService themeServiceF = themeService;
// We now tell the activity manager it is okay to run third party
// code. It will call back into us once it has gotten to the state
// where third party code can really run (but before it has actually
// started launching the initial applications), for us to complete our
// initialization.
mActivityManagerService.systemReady(new Runnable() {
@Override
public void run() {
Slog.i(TAG, "Making services ready");
mSystemServiceManager.startBootPhase(
SystemService.PHASE_ACTIVITY_MANAGER_READY);
try {
mActivityManagerService.startObservingNativeCrashes();
} catch (Throwable e) {
reportWtf("observing native crashes", e);
}
Slog.i(TAG, "WebViewFactory preparation");
WebViewFactory.prepareWebViewInSystemServer();
// Start Nfc before SystemUi to ensure NfcTile and other apps gets a
// valid NfcAdapter from NfcManager
try {
startNfcService(context);
} catch (Throwable e) {
// Don't crash. Nfc is an optional service. Just annotate that isn't ready
Slog.e(TAG, "Nfc service didn't start. Nfc will not be available.", e);
}
try {
startSystemUi(context);
} catch (Throwable e) {
reportWtf("starting System UI", e);
}
try {
if (mountServiceF != null) mountServiceF.systemReady();
} catch (Throwable e) {
reportWtf("making Mount Service ready", e);
}
try {
if (networkScoreF != null) networkScoreF.systemReady();
} catch (Throwable e) {
reportWtf("making Network Score Service ready", e);
}
try {
if (networkManagementF != null) networkManagementF.systemReady();
} catch (Throwable e) {
reportWtf("making Network Managment Service ready", e);
}
try {
if (networkStatsF != null) networkStatsF.systemReady();
} catch (Throwable e) {
reportWtf("making Network Stats Service ready", e);
}
try {
if (networkPolicyF != null) networkPolicyF.systemReady();
} catch (Throwable e) {
reportWtf("making Network Policy Service ready", e);
}
try {
if (connectivityF != null) connectivityF.systemReady();
} catch (Throwable e) {
reportWtf("making Connectivity Service ready", e);
}
try {
if (audioServiceF != null) audioServiceF.systemReady();
} catch (Throwable e) {
reportWtf("Notifying AudioService running", e);
}
Watchdog.getInstance().start();
// It is now okay to let the various system services start their
// third party code...
mSystemServiceManager.startBootPhase(
SystemService.PHASE_THIRD_PARTY_APPS_CAN_START);
try {
if (wallpaperF != null) wallpaperF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying WallpaperService running", e);
}
try {
if (immF != null) immF.systemRunning(statusBarF);
} catch (Throwable e) {
reportWtf("Notifying InputMethodService running", e);
}
try {
if (locationF != null) locationF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying Location Service running", e);
}
try {
if (countryDetectorF != null) countryDetectorF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying CountryDetectorService running", e);
}
try {
if (networkTimeUpdaterF != null) networkTimeUpdaterF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying NetworkTimeService running", e);
}
try {
if (commonTimeMgmtServiceF != null) {
commonTimeMgmtServiceF.systemRunning();
}
} catch (Throwable e) {
reportWtf("Notifying CommonTimeManagementService running", e);
}
try {
if (textServiceManagerServiceF != null)
textServiceManagerServiceF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying TextServicesManagerService running", e);
}
try {
if (atlasF != null) atlasF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying AssetAtlasService running", e);
}
try {
// TODO(BT) Pass parameter to input manager
if (inputManagerF != null) inputManagerF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying InputManagerService running", e);
}
try {
if (telephonyRegistryF != null) telephonyRegistryF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying TelephonyRegistry running", e);
}
try {
if (mediaRouterF != null) mediaRouterF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying MediaRouterService running", e);
}
try {
if (mmsServiceF != null) mmsServiceF.systemRunning();
} catch (Throwable e) {
reportWtf("Notifying MmsService running", e);
}
try {
// now that the system is up, apply default theme if applicable
if (themeServiceF != null) themeServiceF.systemRunning();
ThemeConfig themeConfig =
ThemeConfig.getBootTheme(context.getContentResolver());
String iconPkg = themeConfig.getIconPackPkgName();
mPackageManagerService.updateIconMapping(iconPkg);
} catch (Throwable e) {
reportWtf("Icon Mapping failed", e);
}
}
});
}
代码有点长，不过都大同小异，都是启动一些我们平时常见的服务，ContentService，AlarmManagerService等等
当然最重要的还是WindowManagerService.main，还有mActivityManagerService.setWindowManager
还有wifi和网络服务等等都是在这个方法里开启
启动到这里，systemserver可以算启动完成了，写得比较乱，不过感觉大致功能还是弄清楚了
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