Android Logging Library. Timber is a logger with a small, extensible API which provides utility on top of Android's normal Log class. https://github.com/JakeWharton/timber

1. Android Logging Library.
Timber

2. WHO?
• 松村 勇輝
• Twitter. @Yuki_312
• Yukiの枝折. http://yuki312.blogspot.jp/
• Android Developer

3. CONTENTS
• android.util.Log
• Timber
• Tree

4. android.util.Log
が貧弱でツライ…

5. Log.v("TAG", "log log looooog");
V/TAG: log log looooooog

6. 1. Debug Log
2. Release Log
3. Crash Log
4. Event Log
5. Trace Log
… etc.

7. Timber
https://github.com/JakeWharton/timber

8. Before
Log.d("TAG", "Hello " + first + " " + last + "!");
V/TAG: log log looooooog

9. After
Timber.plant(new DebugTree());
Timber.d("Hello %s %s!", first, last);
D/SampleApplication: Hello Matsumura Yuki!

10. Timber.Tree

11. ログの特性にあった
“木”を植える

12. 1. Debug Log
2. Release Log
3. Crash Log
4. Event Log
5. Trace Log

13. 1. Debug Tree
2. Release Tree
3. Crash Tree
4. Event Tree
5. Trace Tree

14. Debug Tree
V,D,I,W,E 全てのログを出力
Release Tree
W,E のログを出力
Crash Tree
E のログをクラッシュレポートに記録

15. if (debug) {
Timber.plant(new DebugTree()); // デバッグ用ロガー
} else {
Timber.plant(new ReleaseTree()); // リリース用ロガー
Timber.plant(new CrashReportTree()); // レポート用ロガー
}
Plant

16. 1. Application.onCreateでplant
2. オリジナルの“木”が作れる

17. // For Crashlytics. Crash report.
class CrashlyticsTree extends Timber.Tree {
@Override protected void log(int pri, String tag, String msg, Throwable t) {
if (pri == Log.VERBOSE || pri == Log.DEBUG || pri == Log.INFO) {
return;
}
Crashlytics.setString(TAG, msg);
if (t == null) {
Crashlytics.logException(new Exception(msg));
} else {
Crashlytics.logException(t);
}
}
}

18. // For OkHttp. Http Logging.
HttpLoggingInterceptor logging = new HttpLoggingInterceptor(new Logger() {
@Override public void log(String message) {
Timber.tag("OkHttp").d(message);
}
});

19. // For Stetho. Forwards logs to the Chrome Dev Console.
Timber.plant(new StethoTree());

20. まとめ
• Timber.v / d / i / w / e でログ出力
• Timber.plantでTree（ロガー）を指定する
• ログの特性にあったTreeを使う / 作る

21. 以上
ご清聴ありがとうございました