一、概述
WindowManagerService作为Android系统中重要的服务，管理所有的窗口和输入事件的中转站，其相关类如下。
1.1 WMS类族
WMS继承于IWindowManager.Stub,作为Binder服务端
成员变量mSessions保存所有的Session对象，Session继承于IWindowSession.Stub，作为Binder服务端
成员变量mPolicy，实例是PhoneWindowManager，用于实现各种窗口相关的策略
成员变量mWindowMap,保存所有的WindowState对象;以IBinder为key, 是IWindow的Bp端;
每个窗口都对应一个WindowState对象, 该对象的成员变量mClient用于跟应用端交互,成员变量mToken用于跟AMS交互,WindowState的attach方法与SurfaceFlinger通信。
WindowManager与WindowManagerService通过Session进行通信，具体的实现由WMS处理。
WindowManager实现类是WindowManagerImpl ；
WindowManagerImpl 中成员变量 mParentWindow （Window）,mGlobal (WindowManagerGlobal)
1.2 图形框架
Android系统图形系统复杂，包括WindowManager，SurfaceFlinger，Open GL，GPU等模块，其中SurfaceFlinger作为绘制应用UI的核心。Surface代表BufferQueue的生产者端，并由SurfaceFlinger消费。
Image Stream Producter（生产者）:可产生graphic buffers的生产者，例如：OpenGL ES,Canvas 2D，mediaserver的视频编码器
Image Stream Consumers（消费者）：使用Open GL和Hardware Composer来组合一组surfaces
Window Manager：用于管理window，这是一组view容器，WM将window元数据信息发送给SurfaceFlinger，因此SurfaceFlinger能将这些信息来合成surfaces，并输出到显示设备。
Hardware Composer（硬件合成器）：显示子系统的硬件抽象层，SurfaceFlinger能将一些合成工作给Hardware Composer，从而降低OpenGL和GPU的负载。
Gralloc:全程graphics memory allocator，图像内存分配器，用于图形生产请求分配内存。
二、启动过程
WMS在SystemServer中的startOtherServices方法启动，和其启动相关的主要操作如下：
[->SystemServer.java]
private void startOtherServices() {
wm = WindowManagerService.main(context, inputManager,
mFactoryTestMode != FactoryTest.FACTORY_TEST_LOW_LEVEL,
!mFirstBoot, mOnlyCore, new PhoneWindowManager());
...
//见2.1节
mActivityManagerService.setWindowManager(wm);
...
wm.onInitReady();
...
wm.displayReady();
...
wm.systemReady();
}2.1 WMS.main
[->WindowManagerService.java]
public static WindowManagerService main(final Context context, final InputManagerService im,
final boolean haveInputMethods, final boolean showBootMsgs, final boolean onlyCore,
WindowManagerPolicy policy) {
DisplayThread.getHandler().runWithScissors(() ->
//运行在android.display线程
sInstance = new WindowManagerService(context, im, haveInputMethods, showBootMsgs,
onlyCore, policy), 0);
return sInstance;
}2.2 WindowManagerService
[->WindowManagerService.java]
private WindowManagerService(Context context, InputManagerService inputManager,
boolean haveInputMethods, boolean showBootMsgs, boolean onlyCore,
WindowManagerPolicy policy) {
//初始化锁
installLock(this, INDEX_WINDOW);
mContext = context;
mHaveInputMethods = haveInputMethods;
mAllowBootMessages = showBootMsgs;
mOnlyCore = onlyCore;
mLimitedAlphaCompositing = context.getResources().getBoolean(
com.android.internal.R.bool.config_sf_limitedAlpha);
mHasPermanentDpad = context.getResources().getBoolean(
com.android.internal.R.bool.config_hasPermanentDpad);
mInTouchMode = context.getResources().getBoolean(
com.android.internal.R.bool.config_defaultInTouchMode);
mDrawLockTimeoutMillis = context.getResources().getInteger(
com.android.internal.R.integer.config_drawLockTimeoutMillis);
mAllowAnimationsInLowPowerMode = context.getResources().getBoolean(
com.android.internal.R.bool.config_allowAnimationsInLowPowerMode);
mMaxUiWidth = context.getResources().getInteger(
com.android.internal.R.integer.config_maxUiWidth);
mDisableTransitionAnimation = context.getResources().getBoolean(
com.android.internal.R.bool.config_disableTransitionAnimation);
mInputManager = inputManager; // Must be before createDisplayContentLocked.
mDisplayManagerInternal = LocalServices.getService(DisplayManagerInternal.class);
mDisplaySettings = new DisplaySettings();
mDisplaySettings.readSettingsLocked();
mPolicy = policy;
mAnimator = new WindowAnimator(this);
//创建根Window，用于支持多屏幕的功能
mRoot = new RootWindowContainer(this);
mWindowPlacerLocked = new WindowSurfacePlacer(this);
mTaskSnapshotController = new TaskSnapshotController(this);
mWindowTracing = WindowTracing.createDefaultAndStartLooper(context);
LocalServices.addService(WindowManagerPolicy.class, mPolicy);
if(mInputManager != null) {
final InputChannel inputChannel = mInputManager.monitorInput(TAG_WM);
mPointerEventDispatcher = inputChannel != null
? new PointerEventDispatcher(inputChannel) : null;
} else {
mPointerEventDispatcher = null;
}
mDisplayManager = (DisplayManager)context.getSystemService(Context.DISPLAY_SERVICE);
mKeyguardDisableHandler = new KeyguardDisableHandler(mContext, mPolicy);
mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
mPowerManagerInternal = LocalServices.getService(PowerManagerInternal.class);
if (mPowerManagerInternal != null) {
mPowerManagerInternal.registerLowPowerModeObserver(
new PowerManagerInternal.LowPowerModeListener() {
@Override
public int getServiceType() {
return ServiceType.ANIMATION;
}
@Override
public void onLowPowerModeChanged(PowerSaveState result) {
synchronized (mWindowMap) {
final boolean enabled = result.batterySaverEnabled;
if (mAnimationsDisabled != enabled && !mAllowAnimationsInLowPowerMode) {
mAnimationsDisabled = enabled;
dispatchNewAnimatorScaleLocked(null);
}
}
}
});
mAnimationsDisabled = mPowerManagerInternal
.getLowPowerState(ServiceType.ANIMATION).batterySaverEnabled;
}
//创建屏幕锁
mScreenFrozenLock = mPowerManager.newWakeLock(
PowerManager.PARTIAL_WAKE_LOCK, "SCREEN_FROZEN");
mScreenFrozenLock.setReferenceCounted(false);
mAppTransition = new AppTransition(context, this);
mAppTransition.registerListenerLocked(mActivityManagerAppTransitionNotifier);
final AnimationHandler animationHandler = new AnimationHandler();
mBoundsAnimationController = new BoundsAnimationController(context, mAppTransition,
AnimationThread.getHandler(), animationHandler);
mActivityManager = ActivityManager.getService();
mAmInternal = LocalServices.getService(ActivityManagerInternal.class);
mAppOps = (AppOpsManager)context.getSystemService(Context.APP_OPS_SERVICE);
AppOpsManager.OnOpChangedInternalListener opListener =
new AppOpsManager.OnOpChangedInternalListener() {
@Override public void onOpChanged(int op, String packageName) {
updateAppOpsState();
}
};
mAppOps.startWatchingMode(OP_SYSTEM_ALERT_WINDOW, null, opListener);
mAppOps.startWatchingMode(AppOpsManager.OP_TOAST_WINDOW, null, opListener);
mPmInternal = LocalServices.getService(PackageManagerInternal.class);
final IntentFilter suspendPackagesFilter = new IntentFilter();
suspendPackagesFilter.addAction(Intent.ACTION_PACKAGES_SUSPENDED);
suspendPackagesFilter.addAction(Intent.ACTION_PACKAGES_UNSUSPENDED);
context.registerReceiverAsUser(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String[] affectedPackages =
intent.getStringArrayExtra(Intent.EXTRA_CHANGED_PACKAGE_LIST);
final boolean suspended =
Intent.ACTION_PACKAGES_SUSPENDED.equals(intent.getAction());
updateHiddenWhileSuspendedState(new ArraySet<>(Arrays.asList(affectedPackages)),
suspended);
}
}, UserHandle.ALL, suspendPackagesFilter, null, null);
// Get persisted window scale setting
mWindowAnimationScaleSetting = Settings.Global.getFloat(context.getContentResolver(),
Settings.Global.WINDOW_ANIMATION_SCALE, mWindowAnimationScaleSetting);
mTransitionAnimationScaleSetting = Settings.Global.getFloat(context.getContentResolver(),
Settings.Global.TRANSITION_ANIMATION_SCALE,
context.getResources().getFloat(
R.dimen.config_appTransitionAnimationDurationScaleDefault));
setAnimatorDurationScale(Settings.Global.getFloat(context.getContentResolver(),
Settings.Global.ANIMATOR_DURATION_SCALE, mAnimatorDurationScaleSetting));
IntentFilter filter = new IntentFilter();
// Track changes to DevicePolicyManager state so we can enable/disable keyguard.
filter.addAction(ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED);
mContext.registerReceiver(mBroadcastReceiver, filter);
mLatencyTracker = LatencyTracker.getInstance(context);
mSettingsObserver = new SettingsObserver();
mHoldingScreenWakeLock = mPowerManager.newWakeLock(
PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE, TAG_WM);
mHoldingScreenWakeLock.setReferenceCounted(false);
mSurfaceAnimationRunner = new SurfaceAnimationRunner(mPowerManagerInternal);
mAllowTheaterModeWakeFromLayout = context.getResources().getBoolean(
com.android.internal.R.bool.config_allowTheaterModeWakeFromWindowLayout);
mTaskPositioningController = new TaskPositioningController(
this, mInputManager, mInputMonitor, mActivityManager, mH.getLooper());
mDragDropController = new DragDropController(this, mH.getLooper());
LocalServices.addService(WindowManagerInternal.class, new LocalService());
}WMS的初始化在“android.display”线程中执行，mH继承于Handler,采用的是当前线程的Looper， mH.sendMessage方法也运行在android.display”线程
2.3 WMS.onInitReady
[->WindowManagerService.java]
public void onInitReady() {
initPolicy();
// Add ourself to the Watchdog monitors.
Watchdog.getInstance().addMonitor(this);
openSurfaceTransaction();
try {
createWatermarkInTransaction();
} finally {
closeSurfaceTransaction("createWatermarkInTransaction");
}
showEmulatorDisplayOverlayIfNeeded();
}2.3.1 initPolicy
[->WindowManagerService.java]
private void initPolicy() {
//运行在Ui线程
UiThread.getHandler().runWithScissors(new Runnable() {
@Override
public void run() {
WindowManagerPolicyThread.set(Thread.currentThread(), Looper.myLooper());
//此处为PhoneWindowManager
mPolicy.init(mContext, WindowManagerService.this, WindowManagerService.this);
}
}, 0);
}2.3.2 runWithScissors
[->Handler.java]
public final boolean runWithScissors(final Runnable r, long timeout) {
if (r == null) {
throw new IllegalArgumentException("runnable must not be null");
}
if (timeout < 0) {
throw new IllegalArgumentException("timeout must be non-negative");
}
if (Looper.myLooper() == mLooper) {
r.run();
return true;
}
BlockingRunnable br = new BlockingRunnable(r);
return br.postAndWait(this, timeout);
}2.3.3 postAndWait
[->Handler.java::BlockingRunnable]
public boolean postAndWait(Handler handler, long timeout) {
if (!handler.post(this)) {
return false;
}
synchronized (this) {
if (timeout > 0) {
final long expirationTime = SystemClock.uptimeMillis() + timeout;
while (!mDone) {
long delay = expirationTime - SystemClock.uptimeMillis();
if (delay <= 0) {
return false; // timeout
}
try {
wait(delay);
} catch (InterruptedException ex) {
}
}
} else {
while (!mDone) {
try {
wait();
} catch (InterruptedException ex) {
}
}
}
}
return true;
}postAndWait是阻塞操作，把消息放在Handler所指向的线程，此处是android.ui线程，由于该方法运行在android.display线程，从而会进入等待状态，直到执行完成，再唤醒android.display线程，PWM.init运行在android.ui线程，属于同步阻塞。
2.4 PWM.init
[->PhoneWindowManager.java]
public void init(Context context, IWindowManager windowManager,
WindowManagerFuncs windowManagerFuncs) {
mContext = context;
mWindowManager = windowManager;
mWindowManagerFuncs = windowManagerFuncs;
mWindowManagerInternal = LocalServices.getService(WindowManagerInternal.class);
mActivityManagerInternal = LocalServices.getService(ActivityManagerInternal.class);
mInputManagerInternal = LocalServices.getService(InputManagerInternal.class);
mDreamManagerInternal = LocalServices.getService(DreamManagerInternal.class);
mPowerManagerInternal = LocalServices.getService(PowerManagerInternal.class);
mAppOpsManager = (AppOpsManager) mContext.getSystemService(Context.APP_OPS_SERVICE);
mHasFeatureWatch = mContext.getPackageManager().hasSystemFeature(FEATURE_WATCH);
mHasFeatureLeanback = mContext.getPackageManager().hasSystemFeature(FEATURE_LEANBACK);
mAccessibilityShortcutController =
new AccessibilityShortcutController(mContext, new Handler(), mCurrentUserId);
mLogger = new MetricsLogger();
// Init display burn-in protection
boolean burnInProtectionEnabled = context.getResources().getBoolean(
com.android.internal.R.bool.config_enableBurnInProtection);
// Allow a system property to override this. Used by developer settings.
boolean burnInProtectionDevMode =
SystemProperties.getBoolean("persist.debug.force_burn_in", false);
if (burnInProtectionEnabled || burnInProtectionDevMode) {
final int minHorizontal;
final int maxHorizontal;
final int minVertical;
final int maxVertical;
final int maxRadius;
if (burnInProtectionDevMode) {
minHorizontal = -8;
maxHorizontal = 8;
minVertical = -8;
maxVertical = -4;
maxRadius = (isRoundWindow()) ? 6 : -1;
} else {
Resources resources = context.getResources();
minHorizontal = resources.getInteger(
com.android.internal.R.integer.config_burnInProtectionMinHorizontalOffset);
maxHorizontal = resources.getInteger(
com.android.internal.R.integer.config_burnInProtectionMaxHorizontalOffset);
minVertical = resources.getInteger(
com.android.internal.R.integer.config_burnInProtectionMinVerticalOffset);
maxVertical = resources.getInteger(
com.android.internal.R.integer.config_burnInProtectionMaxVerticalOffset);
maxRadius = resources.getInteger(
com.android.internal.R.integer.config_burnInProtectionMaxRadius);
}
mBurnInProtectionHelper = new BurnInProtectionHelper(
context, minHorizontal, maxHorizontal, minVertical, maxVertical, maxRadius);
}
//运行在ui线程
mHandler = new PolicyHandler();
mWakeGestureListener = new MyWakeGestureListener(mContext, mHandler);
mOrientationListener = new MyOrientationListener(mContext, mHandler);
try {
mOrientationListener.setCurrentRotation(windowManager.getDefaultDisplayRotation());
} catch (RemoteException ex) { }
mSettingsObserver = new SettingsObserver(mHandler);
mSettingsObserver.observe();
mShortcutManager = new ShortcutManager(context);
mUiMode = context.getResources().getInteger(
com.android.internal.R.integer.config_defaultUiModeType);
mHomeIntent = new Intent(Intent.ACTION_MAIN, null);
mHomeIntent.addCategory(Intent.CATEGORY_HOME);
mHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
mEnableCarDockHomeCapture = context.getResources().getBoolean(
com.android.internal.R.bool.config_enableCarDockHomeLaunch);
mCarDockIntent = new Intent(Intent.ACTION_MAIN, null);
mCarDockIntent.addCategory(Intent.CATEGORY_CAR_DOCK);
mCarDockIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
mDeskDockIntent = new Intent(Intent.ACTION_MAIN, null);
mDeskDockIntent.addCategory(Intent.CATEGORY_DESK_DOCK);
mDeskDockIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
mVrHeadsetHomeIntent = new Intent(Intent.ACTION_MAIN, null);
mVrHeadsetHomeIntent.addCategory(Intent.CATEGORY_VR_HOME);
mVrHeadsetHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
mBroadcastWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
"PhoneWindowManager.mBroadcastWakeLock");
mPowerKeyWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
"PhoneWindowManager.mPowerKeyWakeLock");
mEnableShiftMenuBugReports = "1".equals(SystemProperties.get("ro.debuggable"));
mSupportAutoRotation = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_supportAutoRotation);
mLidOpenRotation = readRotation(
com.android.internal.R.integer.config_lidOpenRotation);
mCarDockRotation = readRotation(
com.android.internal.R.integer.config_carDockRotation);
mDeskDockRotation = readRotation(
com.android.internal.R.integer.config_deskDockRotation);
mUndockedHdmiRotation = readRotation(
com.android.internal.R.integer.config_undockedHdmiRotation);
mCarDockEnablesAccelerometer = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_carDockEnablesAccelerometer);
mDeskDockEnablesAccelerometer = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_deskDockEnablesAccelerometer);
mLidKeyboardAccessibility = mContext.getResources().getInteger(
com.android.internal.R.integer.config_lidKeyboardAccessibility);
mLidNavigationAccessibility = mContext.getResources().getInteger(
com.android.internal.R.integer.config_lidNavigationAccessibility);
mLidControlsScreenLock = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_lidControlsScreenLock);
mLidControlsSleep = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_lidControlsSleep);
mTranslucentDecorEnabled = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_enableTranslucentDecor);
mAllowTheaterModeWakeFromKey = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_allowTheaterModeWakeFromKey);
mAllowTheaterModeWakeFromPowerKey = mAllowTheaterModeWakeFromKey
|| mContext.getResources().getBoolean(
com.android.internal.R.bool.config_allowTheaterModeWakeFromPowerKey);
mAllowTheaterModeWakeFromMotion = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_allowTheaterModeWakeFromMotion);
mAllowTheaterModeWakeFromMotionWhenNotDreaming = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_allowTheaterModeWakeFromMotionWhenNotDreaming);
mAllowTheaterModeWakeFromCameraLens = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_allowTheaterModeWakeFromCameraLens);
mAllowTheaterModeWakeFromLidSwitch = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_allowTheaterModeWakeFromLidSwitch);
mAllowTheaterModeWakeFromWakeGesture = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_allowTheaterModeWakeFromGesture);
mGoToSleepOnButtonPressTheaterMode = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_goToSleepOnButtonPressTheaterMode);
mSupportLongPressPowerWhenNonInteractive = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_supportLongPressPowerWhenNonInteractive);
mLongPressOnBackBehavior = mContext.getResources().getInteger(
com.android.internal.R.integer.config_longPressOnBackBehavior);
mShortPressOnPowerBehavior = mContext.getResources().getInteger(
com.android.internal.R.integer.config_shortPressOnPowerBehavior);
mLongPressOnPowerBehavior = mContext.getResources().getInteger(
com.android.internal.R.integer.config_longPressOnPowerBehavior);
mVeryLongPressOnPowerBehavior = mContext.getResources().getInteger(
com.android.internal.R.integer.config_veryLongPressOnPowerBehavior);
mDoublePressOnPowerBehavior = mContext.getResources().getInteger(
com.android.internal.R.integer.config_doublePressOnPowerBehavior);
mTriplePressOnPowerBehavior = mContext.getResources().getInteger(
com.android.internal.R.integer.config_triplePressOnPowerBehavior);
mShortPressOnSleepBehavior = mContext.getResources().getInteger(
com.android.internal.R.integer.config_shortPressOnSleepBehavior);
mVeryLongPressTimeout = mContext.getResources().getInteger(
com.android.internal.R.integer.config_veryLongPressTimeout);
mAllowStartActivityForLongPressOnPowerDuringSetup = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_allowStartActivityForLongPressOnPowerInSetup);
mUseTvRouting = AudioSystem.getPlatformType(mContext) == AudioSystem.PLATFORM_TELEVISION;
mHandleVolumeKeysInWM = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_handleVolumeKeysInWindowManager);
readConfigurationDependentBehaviors();
mAccessibilityManager = (AccessibilityManager) context.getSystemService(
Context.ACCESSIBILITY_SERVICE);
// register for dock events
IntentFilter filter = new IntentFilter();
filter.addAction(UiModeManager.ACTION_ENTER_CAR_MODE);
filter.addAction(UiModeManager.ACTION_EXIT_CAR_MODE);
filter.addAction(UiModeManager.ACTION_ENTER_DESK_MODE);
filter.addAction(UiModeManager.ACTION_EXIT_DESK_MODE);
filter.addAction(Intent.ACTION_DOCK_EVENT);
Intent intent = context.registerReceiver(mDockReceiver, filter);
if (intent != null) {
// Retrieve current sticky dock event broadcast.
mDockMode = intent.getIntExtra(Intent.EXTRA_DOCK_STATE,
Intent.EXTRA_DOCK_STATE_UNDOCKED);
}
// register for dream-related broadcasts
filter = new IntentFilter();
filter.addAction(Intent.ACTION_DREAMING_STARTED);
filter.addAction(Intent.ACTION_DREAMING_STOPPED);
context.registerReceiver(mDreamReceiver, filter);
// register for multiuser-relevant broadcasts
filter = new IntentFilter(Intent.ACTION_USER_SWITCHED);
context.registerReceiver(mMultiuserReceiver, filter);
// monitor for system gestures
// TODO(multi-display): Needs to be display specific.
mSystemGestures = new SystemGesturesPointerEventListener(context,
new SystemGesturesPointerEventListener.Callbacks() {
@Override
public void onSwipeFromTop() {
if (mStatusBar != null) {
requestTransientBars(mStatusBar);
}
}
@Override
public void onSwipeFromBottom() {
if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_BOTTOM) {
requestTransientBars(mNavigationBar);
}
}
@Override
public void onSwipeFromRight() {
if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_RIGHT) {
requestTransientBars(mNavigationBar);
}
}
@Override
public void onSwipeFromLeft() {
if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_LEFT) {
requestTransientBars(mNavigationBar);
}
}
@Override
public void onFling(int duration) {
if (mPowerManagerInternal != null) {
mPowerManagerInternal.powerHint(
PowerHint.INTERACTION, duration);
}
}
@Override
public void onDebug() {
// no-op
}
@Override
public void onDown() {
mOrientationListener.onTouchStart();
}
@Override
public void onUpOrCancel() {
mOrientationListener.onTouchEnd();
}
@Override
public void onMouseHoverAtTop() {
mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS);
Message msg = mHandler.obtainMessage(MSG_REQUEST_TRANSIENT_BARS);
msg.arg1 = MSG_REQUEST_TRANSIENT_BARS_ARG_STATUS;
mHandler.sendMessageDelayed(msg, 500);
}
@Override
public void onMouseHoverAtBottom() {
mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS);
Message msg = mHandler.obtainMessage(MSG_REQUEST_TRANSIENT_BARS);
msg.arg1 = MSG_REQUEST_TRANSIENT_BARS_ARG_NAVIGATION;
mHandler.sendMessageDelayed(msg, 500);
}
@Override
public void onMouseLeaveFromEdge() {
mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS);
}
});
mImmersiveModeConfirmation = new ImmersiveModeConfirmation(mContext);
mWindowManagerFuncs.registerPointerEventListener(mSystemGestures);
mVibrator = (Vibrator)context.getSystemService(Context.VIBRATOR_SERVICE);
mLongPressVibePattern = getLongIntArray(mContext.getResources(),
com.android.internal.R.array.config_longPressVibePattern);
mCalendarDateVibePattern = getLongIntArray(mContext.getResources(),
com.android.internal.R.array.config_calendarDateVibePattern);
mSafeModeEnabledVibePattern = getLongIntArray(mContext.getResources(),
com.android.internal.R.array.config_safeModeEnabledVibePattern);
mScreenshotChordEnabled = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_enableScreenshotChord);
mGlobalKeyManager = new GlobalKeyManager(mContext);
// Controls rotation and the like.
initializeHdmiState();
// Match current screen state.
if (!mPowerManager.isInteractive()) {
startedGoingToSleep(WindowManagerPolicy.OFF_BECAUSE_OF_USER);
finishedGoingToSleep(WindowManagerPolicy.OFF_BECAUSE_OF_USER);
}
mWindowManagerInternal.registerAppTransitionListener(
mStatusBarController.getAppTransitionListener());
mWindowManagerInternal.registerAppTransitionListener(new AppTransitionListener() {
@Override
public int onAppTransitionStartingLocked(int transit, IBinder openToken,
IBinder closeToken, long duration, long statusBarAnimationStartTime,
long statusBarAnimationDuration) {
return handleStartTransitionForKeyguardLw(transit, duration);
}
@Override
public void onAppTransitionCancelledLocked(int transit) {
handleStartTransitionForKeyguardLw(transit, 0 /* duration */);
}
});
mKeyguardDelegate = new KeyguardServiceDelegate(mContext,
new StateCallback() {
@Override
public void onTrustedChanged() {
mWindowManagerFuncs.notifyKeyguardTrustedChanged();
}
@Override
public void onShowingChanged() {
mWindowManagerFuncs.onKeyguardShowingAndNotOccludedChanged();
}
});
mScreenshotHelper = new ScreenshotHelper(mContext);
}2.5 WMS.displayReady
private void displayReady(int displayId) {
synchronized(mWindowMap) {
//得到显示的displayid
final DisplayContent displayContent = mRoot.getDisplayContent(displayId);
if (displayContent != null) {
mAnimator.addDisplayLocked(displayId);
displayContent.initializeDisplayBaseInfo();
reconfigureDisplayLocked(displayContent);
}
}
}2.6 WMS.systemReady
[->WindowManagerService.java]
public void systemReady() {
mPolicy.systemReady();
//截屏systemReady
mTaskSnapshotController.systemReady();
mHasWideColorGamutSupport = queryWideColorGamutSupport();
}2.6.1 PWM.systemReady
[->PhoneWindowManager]
public void systemReady() {
// In normal flow, systemReady is called before other system services are ready.
// So it is better not to bind keyguard here.
mKeyguardDelegate.onSystemReady();
mVrManagerInternal = LocalServices.getService(VrManagerInternal.class);
if (mVrManagerInternal != null) {
mVrManagerInternal.addPersistentVrModeStateListener(mPersistentVrModeListener);
}
readCameraLensCoverState();
updateUiMode();
synchronized (mLock) {
updateOrientationListenerLp();
mSystemReady = true;
mHandler.post(new Runnable() {
@Override
public void run() {
updateSettings();
}
});
// If this happens, for whatever reason, systemReady came later than systemBooted.
// And keyguard should be already bound from systemBooted
if (mSystemBooted) {
mKeyguardDelegate.onBootCompleted();
}
}
mSystemGestures.systemReady();
mImmersiveModeConfirmation.systemReady();
mAutofillManagerInternal = LocalServices.getService(AutofillManagerInternal.class);
}三、总结
整个启动过程有3个线程，systemserver主线程，”android.display”,”android.ui”,整个过程采用阻塞的方式（利用runWithScissors）执行，WMS.mH的Looper运行在”android.display”进程。流程如下：
附录
源码路径
frameworks/base/services/java/com/android/server/SystemServer.java
frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
frameworks/base/services/core/java/com/android/server/UiThread.java
frameworks/base/core/java/android/os/Handler.java
frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java
