April 2014
Intermediate to advanced
260 pages
5h
Japanese
Content preview from 実践 Android Developer Tools
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
166
10
章 システムリソースを監視する
10.2.5
Traceview
Traceviewは、メソッドやスレッドがいつ実行を開始したか、実行中にどのメソッド、スレッドに
アクセスされたか、いつ停止したかなど、アプリケーションの実行パスについての詳細情報を与えて
くれるツールだ。これを使えばパフォーマンスの詳細を細かく監視できる（そして最適化に効果があ
るかどうかもわかる）ので、特定のコードパスを最適化しているときに役に立つ。このツールには、作
成したファイルを保存する機能が含まれている。履歴レコードを簡単に管理できるので、時間の経過
とともに最適化がどのように進んだかを追跡できる。
トレースビューを生成するには、「Devices」タブのボタン（
）をクリックする。すると、さまざま
なオプション（ファイルの位置、実行時間、ファイルのサイズの上限）が付いたダイアログが表示され
る。オプションを指定し、「OK」をクリックすると、ファイルが生成される。トレースビューを生成し
たら、自動的にビューア（図10-5）が開かれる。
図10-5 Traceviewのサンプル出力
Traceviewは、次のコマンドでコマンドラインから起動できる（既存ファイルを見たい場合）
traceview filename.trace
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.