android View draw方法传递流程

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原创最新推荐文章于 2026-08-29 13:43:47 发布 1.2k 阅读 AI 写同款· GEO 优化 ›

View的绘制机制&事件分发机制一.View树的绘制流程 measure -> layout -> draw measure 1.ViewGroup.LayoutParams 2.MeasureSpec 重要方法：1.measure 2.onMeasure 3.setMeasuredDimenskion() 它开始于父控件的ViewGroup,它会通过不断的遍历子控件的measure方法，然后会根据ViewGr... 阅读详情

1. ViewRootImpl :doTraversal()

    void doTraversal() {
        if (mTraversalScheduled) {
            mTraversalScheduled = false;
            mHandler.getLooper().removeSyncBarrier(mTraversalBarrier);

            if (mProfile) {
                Debug.startMethodTracing("ViewAncestor");
            }

            Trace.traceBegin(Trace.TRACE_TAG_VIEW, "performTraversals");
            try {
                performTraversals();
            } finally {
                Trace.traceEnd(Trace.TRACE_TAG_VIEW);
            }

            if (mProfile) {
                Debug.stopMethodTracing();
                mProfile = false;
            }
        }
    }

2. ViewRootImpl :performTraversals()

3. ViewRootImpl :performDraw()

4. ViewRootImpl :draw()

5. PhoneWindow$DecorView :draw()

6. ViewGroup :dispatchDraw()

7. ViewGroup :drawChild()

8. View :draw()

9. 延续第 5 ～ 8步，遍历绘制

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