February 2016
Intermediate to advanced
256 pages
4h 7m
Japanese
Content preview from 初めてのAndroid 第4版
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8章ひとつの環境で書いてあらゆる環境でテスト
今日では、Androidはものすごい数のスマホ、タブレット、時計、テレビなど、多様なデバイスに搭載されている。これは素晴らしいことだが困ったことでもある。さまざまな形、サイズ、価格のAndroidデバイスから自分に合ったものを選べることはユーザーにとって素晴らしいことだ。しかし開発者からすると、これらすべてをサポートするのは大変なことであり立ち往生しかねない。
しかもAndroidは非常に早いペースで開発されてきたため、さまざまなバージョンのAndroidを実行するさまざまなデバイスが飛び飛びに残っている。表8-1は今までにリリースされたAndroidのすべてのバージョンをまとめたものだ。Androidの各バージョンを実行するデバイスの割合を示す最新のグラフについてはAndroid Platform Dashboard†1を参照していただきたい。
アスタリスク（*）が付けられているバージョンはもはや使われていない。
AndroidのバージョンコードとAPIレベルはBuild.VERSION_CODESクラスで定義されている。
表8-1 AndroidのバージョンとAPIレベル
| バージョン | コード名 | API | リリース | コメント |
|---|---|---|---|---|
| 1.0* | BASE | 1 | 2008年9月 | 最初のバージョン |
| 1.1* | BASE_1_1 | 2 | 2009年2月 | 添付、マーキー |
| 1.5* | CUPCAKE | 3 | 2009年5月 | ウィジェット、仮想キーボード |
| 1.6* | DONUT | 4 | 2009年9月 | 高密度、低密度ディスプレイ |
| 2.0* | ECLAIR | 5 | 2009年11月 | アカウント切り替え ... |
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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.