April 2014
Intermediate to advanced
260 pages
5h
Japanese
Content preview from 実践 Android Developer Tools
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7.1
LogCat
97
タグを使ってフィルタリングを行えばよい。カスタムタグを作るための構文は、次のとおりである。
Log.level("CustomTag", "Log message")
これを実際に使った例を示そう。
Log.D("UI", "User entered a value: " + myEditText.getText());
このようにしてカスタムタグを作ると、次のようにしてタグが指定したメッセージだけを表示でき
る。
adb logcat UI:D *:S
7.1.5
LogCat
を最大限に活用するには
このように、LogCatの出力はさまざまな方法でフィルタリングできるので、見る必要のあるメッ
セージだけを見れるようにするのは簡単だ。表示されるメッセージを細かくチューニングしたければ、
logcat
コマンドに与えるフィルタ式を増やしていけばよい。
複数のフィルタ式を適用するには、単純に次の
形式で
logcat
コマンドに式を追加していけばよい。
adb logcat
タグ
1:
レベル
タグ
2:
レベル
タグ
3:
レベル
たとえば、アクティビティマネージャが出力したすべての統計を見たい場合は、
ActivityManager:*
タグを使う。パワーマネージャコンポーネントのError以上のメッセージだけを見たい場合は、
PowerManagerService:E
タグを使う。カスタムユーザーインターフェイスタグのメッセージを見たい
場合は、
UI:*
を使う。そして、
*:s
でほかのメッセージを止めるの
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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.