April 2014
Intermediate to advanced
260 pages
5h
Japanese
Content preview from 実践 Android Developer Tools
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214
13
章 ユーザーインターフェイスを最適化する
4. 「Tree View」ボタン（ ）を押して、ビューを生成する。
右下のプログレスバーを見れば、ビューの生成が行われていることがわかる。生成が終わったら、
図13-3のようにビューが表示される。
13.2.3
木構造内を移動する
生成が終わると、図13-2の右側の2 つのタブに内容が表示されている。これらのツールを使った移
動には2つの異なる方法がある。
図13-2 「Hierarchy View」パースペクティブの初期表示
TreeOverview（ ）
「13.1.1.2 レイアウトのネストはパフォーマンスを下げる」でも触れたように、使われていない
ビューがあると、パフォーマンスを下げることがある。図13-3は、UIのなかの個々のビュー
がどのようにレンダリングされるかを俯瞰的に示している。ここでは、1 個の子孫しか持って
いないコンポーネントを探せるので（このようなコンテナは取り除いて、子のビューを直接使
えばよい）、不要なコンポーネントを見つけるには好都合だ。このサンプルで子が1 つしかな
いコンポーネントをどのように見つけたらよいかは、この節の最後の部分で説明する。
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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.
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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.