Android13 View requestLayout流程分析

View的requestLayout方法用于请求重新布局，代码如下：

//frameworks/base/core/java/android/view/View.java
public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource {
    public void requestLayout() {
        if (mMeasureCache != null) mMeasureCache.clear();


        if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) {
            // Only trigger request-during-layout logic if this is the view requesting it,
            // not the views in its parent hierarchy
            ViewRootImpl viewRoot = getViewRootImpl();
            if (viewRoot != null && viewRoot.isInLayout()) {
                if (!viewRoot.requestLayoutDuringLayout(this)) {
                    return;
                }
            }
            mAttachInfo.mViewRequestingLayout = this;
        }


        mPrivateFlags |= PFLAG_FORCE_LAYOUT;
        mPrivateFlags |= PFLAG_INVALIDATED;


        if (mParent != null && !mParent