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What APIs are used to draw over other apps (like Facebook's Chat Heads)?

...t Heads on Android? What is the API to create the floating views on top of all other views? 3 Answers ...
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APP INVENTOR硬件交互学习教程01——开发板介绍 - 创客硬件开发 - 清泛IT社...

今天,介绍一个用于学习APP INVENTOR 硬件交互学习板,它资源丰富,外设较多,非常有利于学习APP inventor。 等待焊接的板子们 已焊接等待调试的 系统板原理图 自己造的板子{:8_389:}{:8_315:}
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How can I get the client's IP address in ASP.NET MVC?

I'm totally new to the ASP.NET MVC stack, and I was wondering what happened to the simple Page object and the Request ServerVariables object? ...
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Can't use Swift classes inside Objective-C

... -Swift.h file, only the bridging headers. So I created it, but it's actually empty. I can use all my ObjC classes in Swift, but I can't do it vice versa. I marked my swift class with @objc but it didn't help. What can I do now? ...
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ASP.NET MS11-100: how can I change the limit on the maximum number of posted form values?

...d it didn't have the ThrowIfMaxHttpCollectionKeysExceeded method: I installed KB2656351 (update for .NET 4.0), reloaded the assemblies in Reflector and the method appeared: So that method is definitely new. I used the Disassemble option in Reflector, and from what I can tell from the code it c...
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PHP: Storing 'objects' inside the $_SESSION

I just figured out that I can actually store objects in the $_SESSION and I find it quite cool because when I jump to another page I still have my object. Now before I start using this approach I would like to find out if it is really such a good idea or if there are potential pitfalls involved....
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How to call a Python function from Node.js

... have a machine learning algorithm to use in Python. Is there a way I can call Python functions from my Node.js application to make use of the power of machine learning libraries? ...
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Location Services not working in iOS 8

My app that worked fine on iOS 7 doesn't work with the iOS 8 SDK. 26 Answers 26 ...
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Remove shadow below actionbar

...PDATE: As @Quinny898 stated, on Android 5.0 this has changed, you have to call setElevation(0) on your action bar. Note that if you're using the support library you must call it to that like so: getSupportActionBar().setElevation(0); ...
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iPhone Debugging: How to resolve 'failed to get the task for process'?

...the app includes an Entitlements.plist file, which is not necessary to install onto the device for debugging. In general, then, I have included this file for release builds (where it is required for the App Store) and removed it for debugging (so I can debug the app from XCode). That may be your pro...