不管是教学，还是为了演示，如果能将Android手机（或平板）的屏幕录制成视频文件，那是一件非常酷的事（iOS8已经提供了这一功能，能通过OS X直接在Mac上录制iPad、iPhone的屏幕，windows没试过，不知可不可以）。不过以前的方法都是通过截屏录制的，效果极差。幸好 Android4.4以上版本提供了这一功能。但无法在手机上直接启动，需要通过adb使用命令行启动。
大家可以进入shell。或干脆直接用adb shell执行命令。该命令是screenrecord，可以输入screenrecord --help，看看帮助，如下所示。
Usage: screenrecord [options] <filename>
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.
你要知道:
screenrecord是一个shell命令
支持Android4.4(API level 19)以上
支持视频格式: mp4
一些限制:
某些设备可能无法直接录制,原因是分辨率太高,如果遇到此类问题，请试着指定较低的分辨率
不支持录制过程中屏幕旋转,如果录制过程中旋转，有可能画面被切断
录制视频的时候声音不会被录下来
开始录制命令:
adb shell screenrecord /sdcard/demo.mp4
说明:录制手机屏幕,视频格式为mp4,存放到手机sd卡里，默认录制时间为180s
限制录制时间:
参数: --time-limit
adb shell screenrecord --time-limit 10 /sdcard/demo.mp4
说明:限制视频录制时间为10s,如果不限制,默认180s
指定视频分辨率大小：
参数: --size
adb shell screenrecord --size 1280*720 /sdcard/demo.mp4
说明:录制视频，分辨率为1280*720，如果不指定默认使用手机的分辨率,为获得最佳效果，请使用设备上的高级视频编码（AVC）支持的大小
指定视频的比特率:
参数: --bit-rate
adb shell screenrecord --bit-rate 6000000 /sdcard/demo.mp4
说明:指定视频的比特率为6Mbps,如果不指定,默认为4Mbps. 你可以增加比特率以提高视频质量或为了让文件更小而降低比特率
在命令行显示log:
参数: --verbose
bixiaopeng@bixiaopeng wirelessqa$ adb shell screenrecord --time-limit 10 --verbose /sdcard/demo.mp4 Main display is 1080x1920 @60.00fps (orientation=0) Configuring recorder for 1080x1920 video at 4.00Mbps Content area is 1080x1920 at offset x=0 y=0 Time limit reached Encoder stopping; recorded 96 frames in 10 seconds Stopping encoder and muxer Executing: /system/bin/am broadcast -a android.intent.action.MEDIA_SCANNER_SCAN_FILE -d file:///sdcard/demo.mp4 Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=file:///sdcard/demo.mp4 } Broadcast completed: result=0
旋转90度:
参数: --rotate
说明:此功能为实验性的，好不好用不知道
查看帮助命令:
参数: --help
bixiaopeng@bixiaopeng ~$ adb shell screenrecord --help Usage: screenrecord [options] <filename> 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 megabits per second. Default 4Mbps. --time-limit TIME Set the maximum recording time, in seconds. Default / maximum is 180. --rotate Rotate the output 90 degrees. --verbose Display interesting information on stdout. --help Show this message. Recording continues until Ctrl-C is hit or the time limit is reached.
导出视频：
adb pull /sdcard/demo.mp4
说明:导出视频到当前目录
参考链接：http://blog.csdn.net/wirelessqa/article/details/22725581