Android命令行工具logcat详细用法
http://blog.csdn.net/lizhiguo0532/article/details/6553887
http://developer.android.com/tools/help/adb.html
1:命令格式:
logcat [option] ... [filter-spec] ...//用空格/" ".隔开
[option]:
-s 默认设置过滤器，如指定'*:s'.
-f <filename> 输出到文件，默认情况是标准输出.
-r [<kbytes>] 循环log的字节数(默认为16)，需要-f.
-n <count> 设置循环log的最大数目，默认是4
-v <format> 设置log的打印格式, <format> 是下面的一种: brief process tag thread raw time threadtime long.
-c 清除所有log并退出.
-d 得到所有log并退出 (不阻塞).
-g 得到环形缓冲区的大小并退出.
-b <buffer> 请求不同的环形缓冲区('main' (默认), 'radio', 'events').
-B 输出log到二进制中.
[filter-spec]:
过滤器语句按照下面的格式描述:tag:priority.tag 表示是标签,priority是表示标签log的最低等级
优先级有下列集中，是按照从低到高顺利排列的:
V - Verbose (lowest priority)
D - Debug
I - Info
W - Warning
E - Error
F - Fatal
S - Silent (highest priority, on which nothing is ever printed)
2:常用输入格式:
(1):控制”日志输出格式:
logcat [-v <format>]
其中format选项如下:
brief - Display priority/tag and PID of originating process (the default format).
process - Display PID only.
tag - Display the priority/tag only.
thread - Display process:thread and priority/tag only.
raw - Display the raw log message, with no other metadata fields.
time - Display the date, invocation time, priority/tag, and PID of the originating process.
long - Display all metadata fields and separate messages with a blank lines.
例子：
brief -- P/tag (876): message (默认格式)
process -- (876): message
tag -- P/tag: message
thread -- P/tag( 876:0x37c) message
raw -- message
time -- 09-08 05:40:26.729 P/tag ( 876): message
threadtime -- 09-08 05:40:26.729 876 892 P/tag : message
long -- [ 09-08 05:40:26.729 876:0x37c P/tag ] message
(2):查看”可用日志缓冲区:
logcat [-b <buffer>]
其中buffer选项如下:
radio - 查看缓冲区的相关的信息.
events - 查看和事件相关的的缓冲区.
main - 查看主要的日志缓冲区
4:编程代码:
java code:
import java.util.Slog;
ex: Slog.i/Slog.e/Slog.d/Slog.w(TAG, “….”)
c/cpp code:
system/core/include/cutils/klog.h
#define KLOG_DEFAULT_LEVEL 3 /* messages <= this level are logged */
ERROR: 3, WARNING: 4, NOTICE: 5, INFO: 6, DEBUG: 7
system/core/include/cutils/log.h
ex: ALOGD/ALOGI/ALOGE (“….”)