Android log system

本文介绍了系统中的三种主要日志:Log、EventLog 和 DropBox 的特点及用途。Log 和 EventLog 作为快速的内存环形缓冲区,主要用于暂时存储文本和二进制数据,适合开发者收集应用和平台级统计信息。而 DropBox 则用于持久化存储较长的文本或二进制数据,写入磁盘,尽管速度较慢但适用于收集崩溃报告和大量统计数据。

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There are basically three logs on the system:

Log:

  • for short, textual data
  • in-memory ringbuffer, fast
  • ephemeral (you'll lose it on a crash, or the ringbuffer scrolls)
  • intended for app developers

EventLog is:

  • for short, binary data
  • in-memory ringbuffer, fast
  • ephemeral (you'll lose it on a crash, or the ringbuffer scrolls)
  • intended for platform developers to collect statistics

DropBox:

  • for long text or binary data
  • persistent, written to disk
  • kinda slow (disk)
  • meant for platform developers too, mostly to collect crashes & large statistics
  • subject to limits, deleted by tag if a tag's count and/or size get too large

DropBox is what we used during development to capture all the StrictMode violations in Gingerbread.

You can use DropBox for one-off debugging, but it's not really recommended. It's definitely not recommended as a way to share data between apps. It's not reliable enough, and you can't put permissions on the data. You should just use a shared userid and use the normal filesystem with appropriate permissions.

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