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.
93
7
章
コードをテストする
7.1
LogCat
Androidプラットフォームは、システム情報を集めて表示するLogCatというロギングメカニズムを
持っている。システムやさまざまなアプリケーションからのログは、一連のバッファに出力され、さ
らに
logcat
コマンドによってフィルタリングされる。Log4Jか java.util.loggingパッケージを使った
経験があれば、この形はよくご存知だろう。さまざまなシステムからの出力を1か所で見ることがで
き、自分のアプリケーションに関連する情報を見るためにフィルタリングを行う。このツールは、仕
事をかなり楽にしてくれるので、すべてのオプションをよく理解するとよい。
Androidは、システムのほぼあらゆることを共通ログファイルに書き込む。ガベージコレクション
などのさまざまなシステムアクティビティについての情報やアプリケーションの出力がすべて同じ
ファイルに送られる
。ロギングシステムは、広範囲の情報を1点に集める中心を提供する。この単一
のファイルが、デバイスにインストールされているすべてのアプリケーションによって共有されてい
ることも重要だ。そのため、ログに機密情報を出力しないように注意しなければならない。Proguard
ユーティリティを使えば、コードをわかりにくくし、特定の詳細部分を隠すことができる。Proguard
は、アプリケーションをリリース用にパッケージングするときに、ログ文を取り除くこともできる（こ
のツールの使い方の詳細は、「9.4.1 Pro ...
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.