April 2014
Intermediate to advanced
260 pages
5h
Japanese
Content preview from 実践 Android Developer Tools
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13.2
Hierarchy Viewer
213
要なビューはパフォーマンスを圧迫し、応答を遅らせて使い心地を下げる。
効率の悪い階層構造からビューを切り離すために役立つツールがいくつか作られている。問題点は
Developer Tools（「4.3 Developer Toolsアプリケーション」参照）で視覚化することができ、XMLや
Javaに含まれるエラーの検出、フィックスにはLint（「7.3 Lint」参照）が使える。そして、ビューの構
造を表示して最適化の方法を見極めるためには、Hierarchy Viewer（「13.2 Hierarchy Viewer」参照）
が使える。
13.2
Hierarchy Viewer
アプリケーションに含まれるビュー要素のことをよく理解しておくことは大切だ。幸い、ADTは、
ビューを視覚化し、問題点を素早く見つけ出すHierarchy Viewer（階層ビューア）
と呼ばれるツール
コレクションを提供している。
複雑なレイアウトは、取り扱いが非常に難しくなることがある。深くネストされたレイアウトを理
解したり、不要なレイアウトを見つけて取り除くのは難しい。ここでは、Hierarchy Viewerを使っ
てレイアウトに含まれるビューの階層構造図を作ろう。そうすれば、レイアウトに含まれるすべての
コンポーネントがどのような性質を持つか、それらの関係をどのように最適化できるかについて、よ
り明確に理解できる。レイアウトの最適化は、不要なレイアウトを取り除き、ビュー階層 ...
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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.