从 android.view.ViewRootImpl.TraversalRunnable.run 到 android.view.View.onMeasure,onLayout,onDraw

从 android.view.ViewRootImpl.TraversalRunnable.run::: 到 android.view.View.onMeasure::int,int:

• 函数栈

函数栈

onMeasure的函数栈：

1. android.view.ViewRootImpl.TraversalRunnable.run:::
2. android.view.ViewRootImpl.doTraversal:::
3. android.view.ViewRootImpl.performTraversals:::
4. android.view.ViewRootImpl.measureHierarchy::View,WindowManager.LayoutParams,Resources,int,int:
5. android.view.ViewRootImpl.performMeasure::int,int:
6. android.view.View.measure::int,int:
7. android.view.View.onMeasure::int,int:

其中在调用了android.view.ViewRootImpl.measureHierarchy之后， android.view.ViewRootImpl.performTraversals又调用了android.view.ViewRootImpl.performMeasure

onLayout的函数栈：

1. android.view.ViewRootImpl.TraversalRunnable.run:::
2. android.view.ViewRootImpl.doTraversal:::
3. android.view.ViewRootImpl.performTraversals:::
4. android.view.ViewRootImpl.performLayout::WindowManager.LayoutParams,int,int:
5. android.view.View.layout::int,int,int,int:
6. android.view.View.onLayout::boolean,int,int,int,int:

其中android.view.ViewRootImpl.performLayout::WindowManager.LayoutParams,int,int:中还调用了android.view.ViewRootImpl.measureHierarchy::View,WindowManager.LayoutParams,Resources,int,int:，android.view.View.layout::int,int,int,int:中还调用了android.view.View.onMeasure::int,int:

onMeasure的调用栈

1. android.view.ViewRootImpl.TraversalRunnable.run:::
2. android.view.ViewRootImpl.doTraversal:::
3. android.view.ViewRootImpl.performTraversals:::
4. android.view.ViewRootImpl.performDraw:::
5. android.view.ViewRootImpl.draw::boolean:
6. android.view.ViewRootImpl.drawSoftware::Surface,AttachInfo,int,int,boolean,Rect:
7. android.view.View.draw::Canvas:
8. android.view.View.onDraw::Canvas:

我们依据这个图来决定读源码的顺序。