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OS X Bash, 'watch' command
... do clear; your_command; sleep 2; done
That will loop forever, clear the screen, run your command, and wait two seconds - the basic watch your_command implementation.
You can take this a step further and create a watch.sh script that can accept your_command and sleep_duration as parameters:
#!/b...
Android: How can I get the current foreground activity (from a service)?
...dcastReceiver as backup (to raise a Notification if the activity is not on-screen) -- here is a blog post with more on this pattern
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iOS 7 parallax effect in my view controller
I'm developing an app for iOS 7 in Objective-C. I've got a screen in my app with a few buttons and a pretty background image. (It's a simple xib with UIButtons on top of a UIImageView .)
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WakeLock 扩展：保持设备唤醒扩展，防止系统休眠和电池优化 · App Inventor 2 中文网
...许屏幕关闭。
返回类型：无返回值
AquireScreenBrightWakeLock 获取屏幕明亮唤醒锁()
获取屏幕明亮唤醒锁，保持屏幕亮着且亮度不变。
返回类型：无返回值
AquireScreenDimWakeLock 获取屏幕昏暗唤醒锁()
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【转】用App Inventor 2实现电子围栏功能 - App应用开发 - 清泛IT社区，为创新赋能！
...的百分比Specifies the Map’s vertical height as a percentage of the Screen’s Height.Latitude地图中心点的纬度Gets the latitude of the center of the Map. To change the latitude, use the PanTo method.获取地图中心点的纬度。可以使用Pan平移方法来改变纬度。LocationSe...
手机串口调试助手：USB OTG 收发文本与十六进制、定时发送（附 .aia 源码）...
...法。
拔掉线后 App 报错
读取失败会触发 Screen1.ErrorOccurred，成品在里面自动关闭串口并停止定时发送，重新插好后再点「打开串口」。
鸿蒙手机能用吗
本成品只验证了 Android 编译；鸿蒙版串口组...
灰度图中找出深色像素并给出坐标 · App Inventor 2 中文网
...加一个图片处理组件先转成灰度（见图片处理）：
when Screen1.Initialize() {
画布1.BackgroundImage = 图片处理1.Grayscale("photo.jpg")
}
实验一：点哪判哪
手指点在画布上，标签显示这个点的坐标、灰度值，以及是不是...
How to implement an android:background that doesn't stretch?
...it match its default value "fill". This will allow image resize to fit the screen. Study @Santosh link for more info. Thanks!
– Hugo
Nov 12 '14 at 8:37
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How to make an app's background image repeat
...ckground image is small and I want it to be repeated and fill in the whole screen. What should I do?
5 Answers
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How can I recognize touch events using jQuery in Safari for iPad? Is it possible?
... too) it now contains an array of all the touches the user has made on the screen. Each touch has its own properties (x,y coords for example)
– David Pean
Jan 21 '11 at 6:05
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