每天一个adb命令：screen 命令详解

screen命令分为截屏screencap命令及录制视频screenrecord命令。

screencap命令：

sage: screencap [-hp] [-d display-id] [FILENAME]
   -h: this message
   -p: save the file as a png.
   -d: specify the display id to capture, default 0.
If FILENAME ends with .png it will be saved as a png.
If FILENAME is not given, the results will be printed to stdout.

截屏保存到sd卡：

adb shell screencap -p /sdcard/screen.png

搜了下，截屏可以直接保存到电脑上，

adb shell screencap -p | sed 's/\r$//' > screen.png

但是运行后，打开生成的png文件一直是损坏状态，待研究。

但是先迂回用：先保存到手机，再pull到PC的方式。

adb shell screencap -p /sdcard/screen.png
adb pull /sdcard/screen.png ~/Desktop/

或者perl可以直接保存到pc：

adb shell screencap -p | perl -pe 's/\x0D\x0A/\x0A/g' > screen.png

screenrecord命令

前提：
仅支持Android4.4(API level 19)以上
仅支持视频格式: mp4

Usage: screenrecord [options] 

Android screenrecord v1.2.  Records the device's display to a .mp4 file.

Options:
--size WIDTHxHEIGHT
    Set the video size, e.g. "1280x720".  Default is the device's main
    display resolution (if supported), 1280x720 if not.  For best results,
    use a size supported by the AVC encoder.
--bit-rate RATE
    Set the video bit rate, in bits per second.  Value may be specified as
    bits or megabits, e.g. '4000000' is equivalent to '4M'.  Default 4Mbps.
--bugreport
    Add additional information, such as a timestamp overlay, that is helpful
    in videos captured to illustrate bugs.
--time-limit TIME
    Set the maximum recording time, in seconds.  Default / maximum is 180.
--verbose
    Display interesting information on stdout.
--help
    Show this message.

Recording continues until Ctrl-C is hit or the time limit is reached.

将录制视频保存到sdcard，默认录制时间180s，按下command+c结束录制。

adb shell screenrecord sdcard/record.mp4

录制10s，分辨率为1280*720的视频：

adb shell screenrecord  --time-limit 10 --size 1280x720 /sdcard/demo.mp4

注意：尺寸使用英文字母x，不是*,否则会提示“Invalid size ‘1280*720’, must be width x height”