Android

[frameworks/base/services/java/com/android/server/SystemServer.java]

private

WindowManagerService.main(context,

inputManager,

mActivityManagerService.mActivityTaskManager);ServiceManager.addService(Context.WINDOW_SERVICE,

wm,

false,DUMP_FLAG_PRIORITY_CRITICAL

DUMP_FLAG_PROTO);//

中mActivityManagerService.setWindowManager(wm);wm.onInitReady();...try

{wm.displayReady();}

wm.computeNewConfiguration(DEFAULT_DISPLAY);DisplayMetrics

metrics

DisplayMetrics();context.getDisplay().getMetrics(metrics);context.getResources().updateConfiguration(config,

metrics);}和

onInitReadydisplayReadysystemReadyupdateConfiguration

接下来我们会根据

[frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java]

public

policy,ActivityTaskManagerService

atm)

DisplayWindowSettingsProvider(),

SurfaceControl.Transaction::new,

Surface::new,SurfaceControl.Builder::new);

}public

policy,ActivityTaskManagerService

atm,

DisplayWindowSettingsProviderdisplayWindowSettingsProvider,

SupplierSurfaceControl.Transaction

transactionFactory,SupplierSurface

surfaceFactory,FunctionSurfaceSession,

{DisplayThread.getHandler().runWithScissors(()

-sInstance

surfaceFactory,surfaceControlFactory),

0);return

policy,ActivityTaskManagerService

atm,

DisplayWindowSettingsProviderdisplayWindowSettingsProvider,

SupplierSurfaceControl.Transaction

transactionFactory,SupplierSurface

surfaceFactory,FunctionSurfaceSession,

{installLock(this,

ActivityTaskManagerServicemGlobalLock

atm.getGlobalLock();mAtmService

atm;mContext

mContext.getPackageManager().hasSystemFeature(FEATURE_PC);mAllowBootMessages

showBootMsgs;...//

LocalServices.getService(DisplayManagerInternal.class);//

Surface

surfaceControlFactory;mTransactionFactory

transactionFactory;mSurfaceFactory

mTransactionFactory.get();mPolicy

policy;//

RootWindowContainer(this);final

ContentResolver

context.getContentResolver();mUseBLAST

Settings.Global.getInt(resolver,Settings.Global.DEVELOPMENT_USE_BLAST_ADAPTER_VR,

1;mSyncEngine

BLASTSyncEngine(this);mWindowPlacerLocked

new

WindowSurfacePlacer(this);mTaskSnapshotController

new

TaskSnapshotController(this);mWindowTracing

WindowTracing.createDefaultAndStartLooper(this,Choreographer.getInstance());LocalServices.addService(WindowManagerPolicy.class,

(DisplayManager)context.getSystemService(Context.DISPLAY_SERVICE);mKeyguardDisableHandler

KeyguardDisableHandler.create(mContext,

mPolicy,

(PowerManager)context.getSystemService(Context.POWER_SERVICE);mPowerManagerInternal

LocalServices.getService(PowerManagerInternal.class);if

null)

{mPowerManagerInternal.registerLowPowerModeObserver(new

PowerManagerInternal.LowPowerModeListener()

{Overridepublic

ServiceType.ANIMATION;}Overridepublic

void

onLowPowerModeChanged(PowerSaveState

result)

!mAllowAnimationsInLowPowerMode)

{mAnimationsDisabled

enabled;dispatchNewAnimatorScaleLocked(null);}}}});mAnimationsDisabled

mPowerManagerInternal.getLowPowerState(ServiceType.ANIMATION).batterySaverEnabled;}mScreenFrozenLock

mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,

SCREEN_FROZEN);mScreenFrozenLock.setReferenceCounted(false);mDisplayNotificationController

new

DisplayWindowListenerController(this);//

AMS

ActivityManager.getService();mActivityTaskManager

ActivityTaskManager.getService();mAmInternal

LocalServices.getService(ActivityManagerInternal.class);mAtmInternal

LocalServices.getService(ActivityTaskManagerInternal.class);...

}WMS

的构造函数的代码非常长其中有包含各种服务我们这里只关注和我们应用

Activity

IllegalArgumentException(runnable

must

IllegalArgumentException(timeout

must

monitors.Watchdog.getInstance().addMonitor(this);createWatermark();showEmulatorDisplayOverlayIfNeeded();

}3.4

{UiThread.getHandler().runWithScissors(new

Runnable()

{WindowManagerPolicyThread.set(Thread.currentThread(),

mPolicy

PhoneWindowManager【5.1】mPolicy.init(mContext,

0);

PhoneWindowManagerrunWithScissors

前面介绍过了如果是当前线程就直接运行如果不是当前线程就阻塞运行。

android.ui

File(/system/etc/setup.conf);FileInputStream

null;DataInputStream

getDefaultDisplayContentLocked();mWatermark

new

displayContent.mRealDisplayMetrics,toks,

mTransaction);mTransaction.apply();}}}

...

[frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java]

public

{mRoot.forAllDisplays(displayContent

displayContent.setMaxUiWidth(mMaxUiWidth));}applyForcedPropertiesForDefaultDisplay();mAnimator.ready();mDisplayReady

true;//

createWatermark重新配置所有显示器大小mRoot.forAllDisplays(DisplayContent::reconfigureDisplayLocked);//

mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN);mIsFakeTouchDevice

mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_FAKETOUCH);}try

{//

ATMSmActivityTaskManager.updateConfiguration(null);}

catch

[frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java]

public

systemReadymPolicy.systemReady();//

DisplayPolicy

systemReadymRoot.forAllDisplayPolicies(DisplayPolicy::systemReady);//

systemReadymTaskSnapshotController.systemReady();mHasWideColorGamutSupport

queryWideColorGamutSupport();mHasHdrSupport

queryHdrSupport();//

加载系统设置UiThread.getHandler().post(mSettingsObserver::loadSettings);//

VRIVrManager

IVrManager.Stub.asInterface(ServiceManager.getService(Context.VR_SERVICE));if

(vrManager

vrManager.getVrModeState();synchronized

(mGlobalLock)

{vrManager.registerListener(mVrStateCallbacks);if

(vrModeEnabled)

vrModeEnabled;mVrStateCallbacks.onVrStateChanged(vrModeEnabled);}}}

catch

computeNewConfigurationLocked(displayId);}

}3.9

computeNewConfigurationLocked(int

displayId)

mRoot.getDisplayContent(displayId);displayContent.computeScreenConfiguration(config);return

config;

mRootRootWindowContainer获取显示指定设备的

DisplayThread

[frameworks/base/services/core/java/com/android/server/DisplayThread.java]

public

Process.THREAD_PRIORITY_DISPLAY

false

Process.THREAD_PRIORITY_FOREGROUND,

false

groupProcess.setThreadGroup(Process.myTid(),

Process.THREAD_GROUP_TOP_APP);super.run();}UiThread

DisplayThread

THREAD_PRIORITY_FOREGROUND值为-2,所以

android.ui

[frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager.java]

public

interceptKeyBeforeQueueing(KeyEvent

event,

{wakeUpFromPowerKey(event.getDownTime());}

else

isWakeKeyWhenScreenOff(keyCode))

拦截掉电源键return

(!hasLongPressOnBackBehavior())

{mBackKeyHandled

~ACTION_PASS_TO_USER;}}break;}case

KeyEvent.KEYCODE_VOLUME_DOWN:case

KeyEvent.KEYCODE_VOLUME_UP:返回值是一个整型如果是

就表示被拦截一开始的电源按键我们就看到了在系统没有启动前电源按键只能用于系统启动但是系统启动后电源按键就可以用于其他的作用了例如语音助手。

PhoneWindowManager

如果你还没有掌握Framework现在想要在最短的时间里吃透它可以参考一下《Android

Framework核心知识点》里面内容包含了Init、Zygote、SystemServer、Binder、Handler、AMS、PMS、Launcher……等知识点记录。

《Framework

核心知识点汇总手册》:https://qr18.cn/AQpN4J

Handler

Android系统的启动过程及Zygote的启动过程应用进程的启动过程

AMS源码分析

Activity生命周期管理onActivityResult执行过程AMS中Activity栈管理详解

深入PMS源码

Framework学习手册》https://qr18.cn/AQpN4J

开机Init