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App装到手机上就"失忆"？关于Activity生命周期的7个硬核问答 - A...
...录状态丢了。这些问题看似毫无关联，根源其实都指向同一个东西——Activity生命周期。
社区里关于这个话题的提问从来没断过。今天把出现频率最高的7个问题集中解答，读完你对App运行机制的认知会上一个台阶。
Q1: Activi...
libpng warning: iCCP: known incorrect sRGB profile
... *.png
where the -n means don't rewrite the files and -q means suppress most of the output except for warnings. Sorry, there's no option yet in pngcrush to suppress everything but the warnings.
Binary Releases of ImageMagick are here
For Android Projects (Android Studio) navigate into res fo...
关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
... 关闭close”模式来操作。我的理解就是Socket就是该模式的一个实现，socket即是一种特殊的文件，一些socket函数就是对其进行的操作（读/写IO、打开、关闭）
既然Unix/Linux是将socket以一种io的形式来编程实现，那对于socket的研究必...
Java current machine name and logged in user?
Is it possible to get the name of the currently logged in user (Windows/Unix) and the hostname of the machine?
4 Answers
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\r\n, \r and \n what is the difference between them? [duplicate]
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\r = CR (Carriage Return) → Used as a new line character in Mac OS before X
\n = LF (Line Feed) → Used as a new line character in Unix/Mac OS X
\r\n = CR + LF → Used as a new line character in Windows
share
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When you exit a C application, is the malloc-ed memory automatically freed?
...of that experience, I can say that it does NOT free memory when programs close.
– San Jacinto
Feb 6 '10 at 15:44
8
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传感器组件 · App Inventor 2 中文网
...用已集成到 App Inventor 中的 ZXing 的某个版本（注：ZXing是一个开源Java类库用于解析多种格式的1D/2D条形码）。
事件
扫描结束(返回结果)
表示扫描仪已读取（文本）结果并提供结果。
方法
执行扫描()
使用相机开始扫...
How to open Atom editor from command line in OS X?
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If you get "File exists" and the Atom command still dose not work just delete it and type the command over again.
– Anders
Mar 14 '14 at 9:34
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Detect if device is iOS
I'm wondering if it's possible to detect whether a browser is running on iOS, similar to how you can feature detect with Modernizr (although this is obviously device detection rather than feature detection).
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django change default runserver port
...ution for I wouldn't recommend it to run the development environment. You lose the advantage of having the server output on the terminal, among other things. If you really want to use supervisor my advice would be to use it with a fully featured WSGI server like Gunicorn. Please don't run the develo...