April 2014
Intermediate to advanced
260 pages
5h
Japanese
Content preview from 実践 Android Developer Tools
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202
12
章 グラフィカルエディタの使い方
え方（この場合は、
centerHorizontal="true"
）を示している。ビューの間の関係を理解すると、レイ
アウトをコントロールする上で非常に大きな意味がある。そして、この視覚的なフィードバックは、
XMLファイルを解読するよりもずっとわかりやすい。
12.3.1
レイアウトアクション
キャンバスの上部には、2 行分のボタンが表示される。上の行はコンフィグレーションチューザ
（「12.6 コンフィグレーションチューザ」参照）、下の行はレイアウトアクションバー（図12-5参照）で
ある。このバーは、コンテキストに合わせて、現在選択されているビューと親に関連するオプション
を表示する（つまり、何を選択するかによって内容が変わる）。
ここでよく見られるオプションは、
gravity
、
layout_width
、
layout_margins
の変更である。たと
えば、図12-5では、
LinearLayout
のなかの
Button
を選択している。バーには、向きの縦横のトグル
など、
LinearLayout
に関係のある操作が表示されている。ほかのオプションとしては、子の位置の揃
え方の指定、子のレイアウト属性（
layout_width
など）の操作、レイアウトのマージンを変更するボタ
ンなどがある。
図12-5 使えるレイアウトオプションを見る
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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.