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How to prevent the activity from loading twice on pressing the button

... will even handle Button Selected States for you (if you provide them) and all the Material Design “goodies” you’d expect from a simple standard Widget. I can’t believe people use timers for this. Then you start seeing strange libraries to handle things like these… – ...
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How to declare global variables in Android?

...em you are encountering is how to save state across several Activities and all parts of your application. A static variable (for instance, a singleton) is a common Java way of achieving this. I have found however, that a more elegant way in Android is to associate your state with the Application con...
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public friend swap member function

...truct vector { void swap(vector&) { /* swap members */ } }; Naturally, then, our class should too, right? Well, not really. The standard library has all sorts of unnecessary things, and a member swap is one of them. Why? Let's go on. What we should do is identify what's canonical, and w...
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How to make input type= file Should accept only pdf and xls

... You could do so by using the attribute accept and adding allowed mime-types to it. But not all browsers do respect that attribute and it could easily be removed via some code inspector. So in either case you need to check the file type on the server side (your second question). Ex...
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Is there a way to make AngularJS load partials in the beginning and not at when needed?

...cs.angularjs.org/api/ng.directive:script) to put your partials in the initially loaded HTML You could also fill in $templateCache (http://docs.angularjs.org/api/ng.$templateCache) from JavaScript if needed (possibly based on result of $http call) If you would like to use method (2) to fill in $tem...
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List of Delphi language features and version in which they were introduced/deprecated

...support in enable on Linux. C++Builder and Delphi now use the same ABI for all calls. Delphi 10.2 Tokyo Support for Linux server apps (Intel 64-bit using LLVM and ARC). Assigning a dynamic arrays to a pointer using the @ operator is only allowed when hard-casting the array. More flexible name...
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Why both no-cache and no-store should be used in HTTP response?

...ce is still valid then the cache can respond with its representation, thus alleviating the need for the server to resend the entire resource. no-store is effectively the full do not cache directive and is intended to prevent storage of the representation in any form of cache whatsoever. I say what...
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Rails: call another controller action from a controller

I need to call the create action in controller A, from controller B. 9 Answers 9 ...
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How can I declare optional function parameters in Javascript? [duplicate]

...b || 0; // b will be set either to b or to 0. } This works as long as all values you explicitly pass in are truthy. Values that are not truthy as per MiniGod's comment: null, undefined, 0, false, '' It's pretty common to see JavaScript libraries to do a bunch of checks on optional inputs befor...
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Grep only the first match and stop

...two the last time I looked. It seems like I have too many arguments, especially without getting the desired outcome. :-/ 5...