adb logcat单独笔记

最新推荐文章于 2024-06-06 16:32:52 发布

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这篇博客介绍了adb logcat的相关命令，包括如何设置过滤器、输出日志到文件、设定日志大小限制、最大数目以及输出格式。重点讲解了不同输出格式如brief、process、tag、thread、raw、time、threadtime和long的用法，帮助读者理解和掌握adb logcat的高级使用技巧。

logcat是android中的一个命令行工具，可以用于得到程序的log信息，使用adb查看log时，中文容易出现乱码，提前先执行CHCP 65001设置一下UTF-8编码。

以下是adb logcat的帮助信息
输入adb logcat –help

Usage: logcat [options] [filterspecs]
options include:
  -s              Set default filter to silent.
                  Like specifying filterspec '*:s'
  -f <filename>   Log to file. Default to stdout
  -r [<kbytes>]   Rotate log every kbytes. (16 if unspecified). Requires -f
  -n <count>      Sets max number of rotated logs to <count>, default 4
  -v <format>     Sets the log print format, where <format> is one of:

                  brief process tag thread raw time threadtime long

  -c              clear (flush) the entire log and exit
  -d              dump the log and then exit (don't block)
  -t <count>      print only the most recent <count> lines (implies -d)
  -t '<time>'     print most recent lines since specified time (implies -d)
  -T <count>      print only the most recent <count> lines (does not imply -d)
  -T '<time>'     print most recent lines since specified time (not imply -d)
                  count is pure numerical, time is 'MM-DD hh:mm:ss.mmm'
  -g              get the size of the log's ring buffer and exit
  -b <buffer>     Request alternate ring buffer, 'main', 'system', 'radio',
                  'events', 'crash' or 'all'. Multiple -b parameters are
                  allowed and results are interleaved. The default is
                  -b main -b system -b crash.
  -B              output the log in binary.
  -S              output statistics.
  -G <size>       set size of log ring buffer, may suffix with K or M.
  -p              print prune white and ~black list. Service is specified as
                  UID, UID/PID or /PID. Weighed for quicker pruning if prefix
                  with ~, otherwise weighed for longevity if unadorned. All
                  other pruning activity is oldest first. Special case ~!
                  represents an automatic quicker pruning for the noisiest
                  UID as determined by the current statistics.
  -P '<list> ...' set prune white and ~black list, using same format as
                  printed above. Must be quoted.

filterspecs are a series of
  <tag>[:priority]

where <tag> is a log component tag (or * for all) and priority is:
  V    Verbose
  D    Debug
  I    Info
  W    Warn
  E    Error
  F    Fatal
  S    Silent (supress all output)

'*' means '*:d' and <tag> by itself means <tag>:v

If not specified on the commandline, filterspec is set from ANDROID_LOG_TAGS.
If no filterspec is found, filter defaults to '*:I'

If not specified with -v, format is set from ANDROID_PRINTF_LOG
or defaults to "brief"

1、 -s 设置logcat过滤器
如tag是System.out
使用就是adb logcat -s System.out，这里的tag区分大小写，并且需要完整的tag；
2、-f 输出日志到文件，需要指定手机里合适的路径。
3、-r 设置kbytes大小，和-f结合使用。
4、-n 设置日志的最大数目，和-r结合使用
5、-v 设置日志的输出格式，包括（brief process tag thread raw time threadtime long）
brief 默认，优先级 / 标签 (进程ID) : 日志信息
process ，优先级 (进程ID) : 日志信息
tag，优先级 / 标签 : 日志信息
thread，优先级 ( 进程ID : 线程ID) 标签 : 日志内容
raw，日志内容
time，日期时间优先级 / 标签 (进程ID) : 进程名称 : 日志信息
threadtime，
long，日期时间进程ID : 线程ID 优先级 / 标签] 日志信息

如adb logcat -v time 输出带时间的logcat；
adb logcat -v threadtime 带时间和线程信息的logcat