Android 12 S WindowManager解读之从dumpsys window windows看window，Android 12 S WindowManager深度解析，从dumpsys窗口看window功能解读

摘要：本文解读了Android 12系统中的WindowManager组件，通过深入研究dumpsys命令下的window和windows模块，详细分析了window的管理机制。文章揭示了Android系统中窗口系统的核心功能和工作原理，包括窗口的创建、管理和交互等。对于理解和优化Android系统性能，提升应用程序开发效率具有重要意义。

/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarWindowController.java

    /**
     * Adds the status bar view to the window manager.
     */
    public void attach() {
        // Now that the status bar window encompasses the sliding panel and its
        // translucent backdrop, the entire thing is made TRANSLUCENT and is
        // hardware-accelerated.
        mLp = new WindowManager.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                mBarHeight,
                WindowManager.LayoutParams.TYPE_STATUS_BAR,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                        | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH
                        | WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS,
                PixelFormat.TRANSLUCENT);
        mLp.privateFlags |= PRIVATE_FLAG_COLOR_SPACE_AGNOSTIC;
        mLp.token = new Binder();
        mLp.gravity = Gravity.TOP;
        mLp.setFitInsetsTypes(0 /* types */);
        mLp.setTitle("StatusBar");
        mLp.packageName = mContext.getPackageName();
        mLp.layoutInDisplayCutoutMode = LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;
        mWindowManager.addView(mStatusBarView, mLp);
        mLpChanged.copyFrom(mLp);
        mContentInsetsProvider.addCallback(this::calculateStatusBarLocationsForAllRotations);
        calculateStatusBarLocationsForAllRotations();
    }

执行adb shell dumpsys window windows 如下：

  Window #3 Window{d2b0acf u0 StatusBar}://window名

    mDisplayId=0(display id,单屏一般都是0，多屏会有其他的比如1) rootTaskId=1(根Taskid) mSession=Session{e98843e 2512:u0a10120} mClient=android.os.BinderProxy@64c3da9

    mOwnerUid=10120 showForAllUsers=true package=com.android.systemui(package包名) appop=NONE

    mAttrs={(0,0)(fillx96) gr=TOP CENTER_VERTICAL(在顶端且居中)sim={adjust=pan}(view布局适配键盘)

//标志0 layoutInDisplayCutoutMode=always//标志1 ty=STATUS_BAR fmt=TRANSLUCENT

      //标志2 fl=NOT_FOCUSABLE SPLIT_TOUCH HARDWARE_ACCELERATED DRAWS_SYSTEM_BAR_BACKGROUNDS

      //标志3 pfl=COLOR_SPACE_AGNOSTIC USE_BLAST FIT_INSETS_CONTROLLED

      //标志4 bhv=DEFAULT

      paramsForRotation={(0,0)(fillx96) gr=TOP CENTER_VERTICAL layoutInDisplayCutoutMode=always ty=STATUS_BAR fmt=TRANSLUCENT}}

    Requested w=7104 h=96 mLayoutSeq=2553

    //标志5 mBaseLayer=171000 mSubLayer=0    mToken=WindowToken{2f5ef2e android.os.BinderProxy@2471d30}

     //标志6 mViewVisibility=0x0 mHaveFrame=true mObscured=false

    mGivenContentInsets=[0,0][0,0] mGivenVisibleInsets=[0,0][0,0]

    //当前config mFullConfiguration={1.0 ?mcc?mnc [en_US] ldltr sw960dp w1776dp h876dp 640dpi xlrg long land vrheadset -touch -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 7104, 3840) mAppBounds=Rect(0, 0 - 7104, 3600) mMaxBounds=Rect(0, 0 - 7104, 3840) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=undefined mAlwaysOnTop=undefined mRotation=ROTATION_0} s.33 fontWeightAdjustment=0}

    //上一次的config mLastReportedConfiguration={1.0 ?mcc?mnc [en_US] ldltr sw960dp w1776dp h876dp 640dpi xlrg long land vrheadset -touch -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 7104, 3840) mAppBounds=Rect(0, 0 - 7104, 3600) mMaxBounds=Rect(0, 0 - 7104, 3840) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=undefined mAlwaysOnTop=undefined mRotation=ROTATION_0} s.33 fontWeightAdjustment=0}

    mHasSurface=true(是否已创建Surface) isReadyForDisplay()=true(是否准备好要显示到屏幕上) mWindowRemovalAllowed=false

    //标志7 Frames: containing=[0,0][7104,3840] parent=[0,0][7104,3840] display=[0,0][7104,3840]

    mFrame=[0,0][7104,96] last=[0,0][7104,96]

     surface=[0,0][0,0]

    ContainerAnimator:

      mLeash=Surface(name=Surface(name=d2b0acf StatusBar)/@0x7ec48b - animation-leash of insets_animation)/@0x239f0e5 mAnimationType=insets_animation

      Animation: com.android.server.wm.InsetsSourceProvider$ControlAdapter@eab4059

        ControlAdapter mCapturedLeash=Surface(name=Surface(name=d2b0acf StatusBar)/@0x7ec48b - animation-leash of insets_animation)/@0x239f0e5

    WindowStateAnimator{1f471bd StatusBar}:

       mAnimationIsEntrance=true      mSurface=Surface(name=StatusBar)/@0x4ea33b2(Surface的名字)

      Surface: shown=true(surface是否已显示) layer=0 alpha=1.0 rect=(0.0,0.0)  transform=(1.0, 0.0, 0.0, 1.0)

      //标志8 mDrawState=HAS_DRAWN       mLastHidden=false

      mEnterAnimationPending=false      mSystemDecorRect=[0,0][0,0]

    mLastFreezeDuration=+268ms

    mForceSeamlesslyRotate=false seamlesslyRotate: pending=null finishedFrameNumber=0

    isOnScreen=true(是否在屏幕上)

    isVisible=true(是否可见)

适配刘海屏

标志0代表当前是怎么适配刘海屏的，Android 是允许您控制是否在刘海区域内显示内容的，有如下几种适配方式，您可以将 layoutInDisplayCutoutMode 设为以下某个值

layoutInDisplayCutoutMode的默认值是LAYOUT_IN_DISPLAY_CUTOUT_MODE_DEFAULT。

layoutInDisplayCutoutMode

窗口类型

标志1代表当前的窗口类型，窗口总共三大类型，分别是Application类型， 子窗口类型，以及系统窗口类型：

窗口Flag

标志2地方的意思是窗口所携带的 flag,这个指的这个这个window 所携带的flag, 窗口的flag如下

窗口Private Flag

标志3处也是窗口的一些Flag特征，只不过这些Flag都添加有@hide的，所以是不对外暴露的，所以应用是无法添加这些flag的。

System Bar Benhaviior

标志4用于描述System Bar的行为

mBaseLayer 

  标志5 mBaseLayer，代表窗口的layer层级，根据窗口Type转化而来，代码如下：

    WindowState(WindowManagerService service, Session s, IWindow c, WindowToken token,
            WindowState parentWindow, int appOp, WindowManager.LayoutParams a, int viewVisibility,
            int ownerId, int showUserId, boolean ownerCanAddInternalSystemWindow,
            PowerManagerWrapper powerManagerWrapper) {

                 ......

        if (mAttrs.type >= FIRST_SUB_WINDOW && mAttrs.type = FIRST_APPLICATION_WINDOW && type