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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...p Inventor is a block-based event-driven programming tool that allows everyone, especially novices, to start programming and building fully functional apps for Android devices. Compared to traditional text programming with Android Studio, it has limited features. We enabled App Inventor with multi-t...
Why do people say there is modulo bias when using a random number generator?
...d a lot but never seen a true concrete answer to it. So I am going to post one here which will hopefully help people understand why exactly there is "modulo bias" when using a random number generator, like rand() in C++.
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URL encoding in Android
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I'm going to add one suggestion here. You can do this which avoids having to get any external libraries.
Give this a try:
String urlStr = "http://abc.dev.domain.com/0007AC/ads/800x480 15sec h.264.mp4";
URL url = new URL(urlStr);
URI uri ...
Test or check if sheet exists
...ination workbook to the sheet with the same name as the currently iterated one in the origin workbook.
22 Answers
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_DEBUG vs NDEBUG
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I rely on NDEBUG, because it's the only one whose behavior is standardized across compilers and implementations (see documentation for the standard assert macro). The negative logic is a small readability speedbump, but it's a common idiom you can quickly adapt to...
How to make vim paste from (and copy to) system's clipboard?
...our system's clipboard. Assuming you have the appropriate compile options, one or the other should work.
You might like to remap this to something more convenient for you. For example, you could put vnoremap <C-c> "*y in your ~/.vimrc so that you can visually select and press Ctrl+c to yank t...
Application Skeleton to support multiple screens
... Exceeds 4 inches
xlarge Exceeds 7 inches
Most phones are classified as small or normal (roughly 3 to 4 inches diagonally). But now, there are many phones with large screen such as Galaxy S4, HTC One, Xperia Z
A small tablet like the Samsung Galaxy Tab is classified as larg...
Checking images for similarity with OpenCV
...ne the most common such techniques and their results.
Comparing histograms
One of the simplest & fastest methods. Proposed decades ago as a means to find picture simmilarities. The idea is that a forest will have a lot of green, and a human face a lot of pink, or whatever. So, if you compare two...
Rubymine: How to make Git ignore .idea files created by Rubymine
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It is a bad practice to commit IDE specific files. One reason is that different developers may use different tools. Another one is that those files may contain user specific configuration which will get conflict all the time.
– Jordan Silva
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Generator Expressions vs. List Comprehension
...list comprehension.
Since performance is the most common reason to choose one over the other, my advice is to not worry about it and just pick one; if you find that your program is running too slowly, then and only then should you go back and worry about tuning your code.
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