不管是教學，還是為了演示，如果能將Android手機（或平板）的屏幕錄制成視頻文件，那是一件非常酷的事（iOS8已經提供了這一功能，能通過OS X直接在Mac上錄制iPad、iPhone的屏幕，windows沒試過，不知可不可以）。不過以前的方法都是通過截屏錄制的，效果極差。幸好 Android4.4以上版本提供了這一功能。但無法在手機上直接啟動，需要通過adb使用命令行啟動。
大家可以進入shell。或干脆直接用adb shell執行命令。該命令是screenrecord，可以輸入screenrecord --help，看看幫助，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是一個shell命令
支持Android4.4(API level 19)以上
支持視頻格式: mp4
一些限制:
某些設備可能無法直接錄制,原因是分辨率太高,如果遇到此類問題，請試着指定較低的分辨率
不支持錄制過程中屏幕旋轉,如果錄制過程中旋轉，有可能畫面被切斷
錄制視頻的時候聲音不會被錄下來
開始錄制命令:
adb shell screenrecord /sdcard/demo.mp4
說明:錄制手機屏幕,視頻格式為mp4,存放到手機sd卡里，默認錄制時間為180s
限制錄制時間:
參數: --time-limit
adb shell screenrecord --time-limit 10 /sdcard/demo.mp4
說明:限制視頻錄制時間為10s,如果不限制,默認180s
指定視頻分辨率大小：
參數: --size
adb shell screenrecord --size 1280*720 /sdcard/demo.mp4
說明:錄制視頻，分辨率為1280*720，如果不指定默認使用手機的分辨率,為獲得最佳效果，請使用設備上的高級視頻編碼（AVC）支持的大小
指定視頻的比特率:
參數: --bit-rate
adb shell screenrecord --bit-rate 6000000 /sdcard/demo.mp4
說明:指定視頻的比特率為6Mbps,如果不指定,默認為4Mbps. 你可以增加比特率以提高視頻質量或為了讓文件更小而降低比特率
在命令行顯示log:
參數: --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
旋轉90度:
參數: --rotate
說明:此功能為實驗性的，好不好用不知道
查看幫助命令:
參數: --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.
導出視頻：
adb pull /sdcard/demo.mp4
說明:導出視頻到當前目錄
參考鏈接：http://blog.csdn.net/wirelessqa/article/details/22725581