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What is the difference between Fragment and FragmentActivity?

... inheritance differences, what are the main differences between Fragment and FragmentActivity ? To what scenarios are each class best suited? I'm trying to get an understanding of why both of these classes exist... ...
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Is it a good idea to index datetime field in mysql?

...n/5.0/en/mysql-indexes.html This makes your datetime column an excellent candidate for an index if you are going to be using it in conditions frequently in queries. If your only condition is BETWEEN NOW() AND DATE_ADD(NOW(), INTERVAL 30 DAY) and you have no other index in the condition, MySQL will...
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What are C++ functors and their uses?

...about functors in C++. Can someone give me an overview as to what they are and in what cases they would be useful? 14 Answe...
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How can I get zoom functionality for images?

Is there a common way to show a big image and enable the user to zoom in and out and pan the image? 13 Answers ...
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In Python, what happens when you import inside of a function? [duplicate]

What are the pros and cons of importing a Python module and/or function inside of a function, with respect to efficiency of speed and of memory? ...
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Ignore Xcode warnings when using Cocoapods

...? Currently I use s.dependency 'Facebook-iOS-SDK' s.inhibit_all_warnings! and I get the following error: undefined method `inhibit_all_warnings!' for #<Pod::Specification for MyApp(1.0)> – KrauseFx Nov 3 '12 at 21:27 ...
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Comments in Markdown

...]: <> (This is also a comment.) To improve platform compatibility (and to save one keystroke) it is also possible to use # (which is a legitimate hyperlink target) instead of <>: [//]: # (This may be the most platform independent comment) For maximum portability it is important to i...
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How to tell if JRE or JDK is installed

... testing. However, when I got a java application working on this computer, and then tried it on another, it complained that JDK was required. How can I check if JDK was somehow installed on my system? Note: the computer in question is a Mac. ...
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Python coding standards/best practices [closed]

... you generally use PEP 8 -- Style Guide for Python Code as your coding standards/guidelines? Are there any other formalized standards that you prefer? ...
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Data structure for loaded dice?

...e. for a fixed set of probabilities) so that I can efficiently simulate a random roll of the die. 4 Answers ...