android 属性动画源码分析

https://blog.csdn.net/lmj623565791/article/details/42056859

onAnimationUpdate:41, MainActivity$1$1 (com.example.ronnie.test)animateValue:1547, ValueAnimator (android.animation)animateBasedOnTime:1339, ValueAnimator (android.animation)doAnimationFrame:1471, ValueAnimator (android.animation)doAnimationFrame:146, AnimationHandler (android.animation)access$100:37, AnimationHandler (android.animation)doFrame:54, AnimationHandler$1 (android.animation)run:947, Choreographer$CallbackRecord (android.view)doCallbacks:761, Choreographer (android.view)doFrame:693, Choreographer (android.view)run:935, Choreographer$FrameDisplayEventReceiver (android.view)handleCallback:873, Handler (android.os)dispatchMessage:99, Handler (android.os)loop:193, Looper (android.os)main:6669, ActivityThread (android.app)invoke:-1, Method (java.lang.reflect)run:493, RuntimeInit$MethodAndArgsCaller (com.android.internal.os)main:858, ZygoteInit (com.android.internal.os)

属性动画每次更新的堆栈如上，从堆栈可以看出，都是用Choreographer注册FrameDisplayEventReceiver监听屏幕的刷新时机，然后回掉给AnimationHandler，再传递给Animator去根据当前的时间计算value，这是需要使用差值器和估值器去计算

下面的堆栈的tween动画的刷新堆栈

applyTransformation:68, AlphaAnimation (android.view.animation)getTransformation:906, Animation (android.view.animation)getTransformation:980, Animation (android.view.animation)applyLegacyAnimation:19757, View (android.view)draw:19873, View (android.view)drawChild:4333, ViewGroup (android.view)dispatchDraw:4112, ViewGroup (android.view)dispatchDraw:2023, ConstraintLayout (android.support.constraint)updateDisplayListIfDirty:19073, View (android.view)recreateChildDisplayList:4317, ViewGroup (android.view)dispatchGetDisplayList:4290, ViewGroup (android.view)updateDisplayListIfDirty:19042, View (android.view)recreateChildDisplayList:4317, ViewGroup (android.view)dispatchGetDisplayList:4290, ViewGroup (android.view)updateDisplayListIfDirty:19042, View (android.view)recreateChildDisplayList:4317, ViewGroup (android.view)dispatchGetDisplayList:4290, ViewGroup (android.view)updateDisplayListIfDirty:19042, View (android.view)recreateChildDisplayList:4317, ViewGroup (android.view)dispatchGetDisplayList:4290, ViewGroup (android.view)updateDisplayListIfDirty:19042, View (android.view)recreateChildDisplayList:4317, ViewGroup (android.view)dispatchGetDisplayList:4290, ViewGroup (android.view)updateDisplayListIfDirty:19042, View (android.view)updateViewTreeDisplayList:686, ThreadedRenderer (android.view)updateRootDisplayList:692, ThreadedRenderer (android.view)draw:801, ThreadedRenderer (android.view)draw:3311, ViewRootImpl (android.view)performDraw:3115, ViewRootImpl (android.view)performTraversals:2484, ViewRootImpl (android.view)doTraversal:1460, ViewRootImpl (android.view)run:7183, ViewRootImpl$TraversalRunnable (android.view)run:949, Choreographer$CallbackRecord (android.view)doCallbacks:761, Choreographer (android.view)doFrame:696, Choreographer (android.view)run:935, Choreographer$FrameDisplayEventReceiver (android.view)handleCallback:873, Handler (android.os)dispatchMessage:99, Handler (android.os)loop:193, Looper (android.os)main:6669, ActivityThread (android.app)invoke:-1, Method (java.lang.reflect)run:493, RuntimeInit$MethodAndArgsCaller (com.android.internal.os)main:858, ZygoteInit (com.android.internal.os)

tween动画和属性动画的实现原理完全不同，

tween动画是在刷新的过程中，viewgroup在dispatchDraw的过程中，如果当前view的animation存在，通过执行applyTransformation 来实现视觉上的动画

属性动画是通过监听vsync信号，由chroegraphor回掉来通过valueanimator计算当前的时间以及value来实现动画.

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