Drawing the layout is a two pass process: a measure pass and a layout pass.
布局绘画涉及两个过程：测量过程和布局过程。
Your application will perform better by reducing as much as possible any unnecessary invocations of the layout pass.
应用程序应尽可能减少不必要的布局处理过程调用，从而改善性能。
Your application will perform better by reducing as much as possible any unnecessary invocations of the layout pass.
应用程序应尽可能减少不必要的布局处理过程调用，从而改善性能。
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