时间限制视频录制：screenrecord –time-limit 20 /sdcard/demo.mp4抓屏：screencap -p /sdcard/screen.pngscreenshot /sdcard/screen.png
视频录制命令screenrecord# screenrecord –help Usage: screenrecord [options] <filename>Records the device’s display to a .mp4 file.Options:–size WIDTHxHEIGHT Set the video size, e.g. "1280×720". Default is the device’s main display resolution (if supported), 1280×720 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.截图命令screencap# screencap -h usage: 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.# screenshot -hscreenshot: invalid option — husage: screenshot [-s soundfile] filename.png -s: play a sound effect to signal success -i: autoincrement to avoid overwriting filename.png
，生命不在长而在于好，只要每一次尽力的演示，都值得鼓励与喝采。
