April 2014
Intermediate to advanced
260 pages
5h
Japanese
Content preview from 実践 Android Developer Tools
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11.1
Android
のレイアウトの基本コンセプト
175
め、ソースコードを書き換えたり再コンパイルしたりせずに、レイアウトを変更できるのである。そ
して、複数のデバイスの向き、画面サイズ、位置に合わせて異なるレイアウトを作れる。
なお、XMLで行っていることはほぼすべてJavaコードでもできるし、XMLとJavaの組み合わせ
でもできることは頭に入れておこう。たとえば、XMLでボタンの位置とサイズを定義し、実行される
コードパスによって実行時にJavaでテキストをセットするというようなことができる。
11.1.2
ビューとビューグループ
Androidのレイアウトは、これら2 つの基本オブジェクトを階層構造にまとめて作る。
ビュー
ビュー（
android.view.View
）は、多くのウィジェット（
TextView
、
Button
など）の基底クラ
スである。
android.view
パッケージに含まれるほぼすべてのUIコンポーネントの基底クラ
スでもある。
ビューグループ
ビューグループ（
android.view.ViewGroup
）は、ほかのビューを含むビューである。ビュー
グループクラスは、Androidの多くのレイアウトや、
ListView
、
WebView
などのコンポーネ
ントの基底クラスである。
レイアウトを可視化するための第1歩は、単純な階層構造を定義することだ。たとえば、図11-1の
ようになるだろう。
図11-1 レイアウトの基礎: ビュー階層
レイアウト作成の次のステップは、コードで階層構造を記述する ...
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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.
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.