前两天把免费撸电信的C8815给刷成了MIUI,感觉很不错,装了幸运破解器,但发现闪退,就连电脑看了下日志,发现没装Android Studio来调试真心难受,可惜电脑太渣跑不动Android Studio,只用adb来看了.
使用帮助
首先用adb logcat --help查看帮助项:
Usage: logcat [options] [filterspecs]
options include:
-s Set default filter to silent. Equivalent to filterspec '*:S'
-f <file>, --file=<file> Log to file. Default is stdout
-r <kbytes>, --rotate-kbytes=<kbytes>
Rotate log every kbytes. Requires -f option
-n <count>, --rotate-count=<count>
Sets max number of rotated logs to <count>, default 4
--id=<id> If the signature id for logging to file changes, then clear
the fileset and continue
-v <format>, --format=<format>
Sets log print format verb and adverbs, where <format> is:
brief help long process raw tag thread threadtime time
and individually flagged modifying adverbs can be added:
color descriptive epoch monotonic printable uid
usec UTC year zone
Multiple -v parameters or comma separated list of format and
format modifiers are allowed.
-D, --dividers Print dividers between each log buffer
-c, --clear Clear (flush) the entire log and exit
if Log to File specified, clear fileset instead
-d Dump the log and then exit (don't block)
-e <expr>, --regex=<expr>
Only print lines where the log message matches <expr>
where <expr> is a Perl-compatible regular expression
-m <count>, --max-count=<count>
Quit after printing <count> lines. This is meant to be
paired with --regex, but will work on its own.
--print Paired with --regex and --max-count to let content bypass
regex filter but still stop at number of matches.
-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...'
'YYYY-MM-DD hh:mm:ss.mmm...' or 'sssss.mmm...' format
-g, --buffer-size Get the size of the ring buffer.
-G <size>, --buffer-size=<size>
Set size of log ring buffer, may suffix with K or M.
-L, --last Dump logs from prior to last reboot
-b <buffer>, --buffer=<buffer> Request alternate ring buffer, 'main',
'system', 'radio', 'events', 'crash', 'default' or 'all'.
Multiple -b parameters or comma separated list of buffers are
allowed. Buffers interleaved. Default -b main,system,crash.
-B, --binary Output the log in binary.
-S, --statistics Output statistics.
-p, --prune 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> ...', --prune='<list> ...'
Set prune white and ~black list, using same format as
listed above. Must be quoted.
--pid=<pid> Only prints logs from the given pid.
--wrap Sleep for 2 hours or when buffer about to wrap whichever
comes first. Improves efficiency of polling by providing
an about-to-wrap wakeup.
filterspecs are a series of
<tag>[:priority]
where <tag> is a log component tag (or * for all) and priority is:
V Verbose (default for <tag>)
D Debug (default for '*')
I Info
W Warn
E Error
F Fatal
S Silent (suppress all output)
'*' by itself means '*:D' and <tag> by itself means <tag>:V.
If no '*' filterspec or -s on command line, all filter defaults to '*:V'.
eg: '*:S <tag>' prints only <tag>, '<tag>:S' suppresses all <tag> log messages.
If not specified on the command line, filterspec is set from ANDROID_LOG_TAGS.
If not specified with -v on command line, format is set from ANDROID_PRINTF_LOG
or defaults to "threadtime"
日志等级
日志分为7个级别,但实际上最后一个S是屏蔽日志输出的意思,因此有效的级别是6个.
V Verbose (default for <tag>)
D Debug (default for '*')
I Info
W Warn
E Error
F Fatal
S Silent (suppress all output)
过滤日志
adb logcat <tag>[:priority] <tag>[:priority] ...
tag 是输出日志的标签,通常是应用名,priority则是日志输出的等级.可以组合多个.
查看所有等级和所有应用输出的日志的命令直接就是:adb logcat
查看所有应用的Warn及更高等级的日志命令:adb logcat *:W
只查看含有特定标签的Debug命令,如包含Test标签: adb logcat Test:D *:S
查看特定进程的日志,则首先确定运行的应用进程pid,可以使用命令adb shell进入shell模式,然后使用ps -ef | grep xxx来过滤出pid,然后退出shell模式,使用命令adb logcat --pid=xxx查看所有该应用的日志,也可以加上Level过滤指定等级的日志,比如:adb logcat *:E --pid=xxx
当连接了多个设备时,先使用adb devices获取设备序列号,然后使用-s <serial number>参数指定设备的序列号,比如设备序列号为7512874,则查看日志的命令可以是:adb -s 7512874 logcat *:E --pid=xxx
格式化输出
使用-v命令可以格式化输出,有以下几种格式输出:
1. brief 默认格式
<priority>/<tag>(<pid>): <message>
- process
<priority>(<pid>) <message> - tag
<priority>/<tag>: <message> - raw
<message> - time
<datetime> <priority>/<tag>(<pid>): <message> - threadtime
<datetime> <pid> <tid> <priority> <tag>: <message> - long
<datetime> <pid>:<tid> <priority>/<tag>