July 2014
Intermediate to advanced
248 pages
5h 19m
Chinese
Content preview from Android Developer Tools深入精要
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層級檢視器（
Hierarchy Viewer
）
|
207
[Page-211]
圖
13-10
層級檢視：良好的版面
這值得去多測量幾次，因為數值在每次建立層級架構圖時會有所改變。
利用
Tree Overview
重新檢視架構
現在我們已找到效能較差的
UI
，下一步看看它們的整體結構；
Tree Overview
可以很
容易地概觀查看樹狀結構，並了解此樹狀結構是否複雜，愈複雜的結構需要花更長的
時間進行繪製；你還可以利用此樹狀結構判別層次是否太深，較深的階層架構對效能
有明顯的影響，因為系統在佈局定位前需要花更多時間在測量元件的大小。
208
|
第十三章：最佳化使用者介面
[Page-212]
圖
13-11
層級檢視：遜色的時間數值
層級檢視器（
Hierarchy Viewer
）
|
209
[Page-213]
圖
13-12
層級檢視：良好的時間數值
查看這兩種不同的結構，可以很容易地看出其中一個效能比另一個還要好的原因；「良
好」的版面基本上是完全扁平化的（
flat
）（如圖
13-13 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.