一个方便的获取Android设备屏幕截图的小脚本

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在开发app的过程中，我们经常要获取一张app截图，以供和产品，设计师或者测试工程师交流时使用，这时我们想到的，当然是adb了。打开adb的使用说明文档，你可以找到用来获取截图的命令是screencap，使用方法如下：

adb shell screencap /sdcard/screen.png

但是，你会发现你不能将获取到的截图保存在你的电脑上，聪明的你肯定想到下面这种做法：

adb shell screencap /sdcard/screen.pngadb pull /sdcard/screen.png ~/Desktop/

但是你发现完成这个工作需要敲两行命令，太麻烦了，于是你写了一个shell脚本screencap.sh：

#! /bin/sh# take a screenshotadb shell screencap /sdcard/screen.png# pull it from your device to your computeradb pull /sdcard/screen.png ~/Desktop/# delete the screenshot on your device since you already have it on your computer adb shell rm /sdcard/screen.png

这样，以后你就可以执行screencap.sh获取到截图了，是不是很方便？
然而，很快你会发现问题所在，每次获取到的截图名字都是screen.png，每次截图就会把上一次的截图覆盖掉，这时你会想到，在将截图从调试机器pull到你的电脑上时，指定一个文件名：

#! /bin/shextention=".png"file_name=$(basename "$1" ".png")$extention# take a screenshotadb shell screencap /sdcard/$file_name# pull it from your device to your computeradb pull /sdcard/$file_name ~/Desktop/# delete the screenshot on your device since you already have it on your computer adb shell rm /sdcard/$file_name

或者使用时间作为文件名，如果你懒得想名字的话：

#! /bin/shfile_name=$(date "+%Y%m%d%H%M%S")".png"# take a screenshotadb shell screencap /sdcard/$file_name# pull it from your device to your computeradb pull /sdcard/$file_name ~/Desktop/# delete the screenshot on your device since you already have it on your computer adb shell rm /sdcard/$file_name

最后，作为一个爱折腾的程序员，你发现你有时候想指定截图存放在电脑上的路径，于是有了以下这个终极版的脚本：

#! /bin/shif [ "$1" = "." ]; then    echo "Invalid argument ".", A file name or a path is required to save your screenshots if any argument is presented."    exit fidefault_dest=~/"Desktop"extention=".png"if [ $# -eq 0 ]; then    dest=${default_dest}    file_name=$(date "+%Y%m%d%H%M%S")$extentionelse    if [ -d "$1" ]; then        dest="$1"        file_name=$(date "+%Y%m%d%H%M%S")$extention    elif [ -d $(dirname "$1") ] && [ $(dirname "$1") != "." ]; then        dest=$(dirname "$1")        file_name=$(basename "$1" ".png")$extention    else        dest=${default_dest}        file_name=$(basename "$1" ".png")$extention    fifi# take a screenshotadb shell screencap /sdcard/$file_name# pull it from your device to your computeradb pull /sdcard/$file_name $dest/$file_name# delete the screenshot on your device since you already have it on your computer adb shell rm /sdcard/$file_name

现在，有了这个小脚本，你可以：
1.临时截一张图，连名字都懒得想，就放在桌面，发给同事后马上删除掉:

screencap.sh 

2.给截图取一个名字，放在桌面：

screencap somefeature.png

3.截一张图，放在自定义目录里，保留着，说不定哪天还要打开看看：

screencap ~/Desktop/work/someapp/screenshot/somefeature.png