April 2014
Intermediate to advanced
260 pages
5h
Japanese
Content preview from 実践 Android Developer Tools
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8.6
「開発者向けオプション」メニュー
131
8.6
「開発者向けオプション」メニュー
Android 4.0には、いくつかの非常に面白い機能を追加した新しいデベロッパーツールが含まれて
いる。
このツールには、スマートフォンの「設定」アプリケーションを開き、「開発者向けオプション」を選
べばアクセスできる（ver.4.2以降のデバイスを使っている場合、このオプションを有効にするために
は、4.3 節のヒントで説明されている手順が必要になる）。
このツール（図8-10参照）には、深いレベルでUIとアプリケーションのパフォーマンスを理解する
ための高度なオプションが多数含まれている。そのオプションを紹介しておこう。
Strictmodeenabled（厳格モードを有効にする)
アプリケーションが UI スレッドで長い処理を行っているときに、画面をフラッシュさせる。
UIのフリーズを見つけ、UIが応答していない時間を
知るために役に立つ。モバイルユーザー
は、ごくわずかな遅れに敏感に気付くので、可能な限り、遅れを最小限に抑える必要がある。
このオプションを使うと、長時間実行されているプロセスが簡単に見つかるので、それらは
バックグラウンドに回したり、UIスレッドから外したりすることができる（UIスレッドから
外せばアプリケーションのフリーズは避けられる。
Pointerlocation（ポインターの位置）
図8-11は、画面の特定の位置をハイライト表示したところを示している。画面上の任意の位
置に指かマウ ...
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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.