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How to test if list element exists?

I would like to test if an element of a list exists, here is an example 7 Answers 7 ...
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Getting the current Fragment instance in the viewpager

... As shown in the onOptionsItemSelected() , by selecting an option, I need to update the fragment that is currently visible. To update that I have to call a method which is in the fragment class. Can someone please suggest how to call that method? ...
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How can I temporarily disable a foreign key constraint in MySQL?

Is it possible to temporarily disable constraints in MySQL? 10 Answers 10 ...
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Are Javascript arrays sparse?

That is, if I use the current time as an index into the array: 7 Answers 7 ...
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How to add “on delete cascade” constraints?

In PostgreSQL 8 is it possible to add ON DELETE CASCADES to the both foreign keys in the following table without dropping the latter? ...
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How to perform file system scanning

I know how to do 2 (I am going to use jstree to display it in the browser). 7 Answers ...
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Servlet for serving static content

I deploy a webapp on two different containers (Tomcat and Jetty), but their default servlets for serving the static content have a different way of handling the URL structure I want to use ( details ). ...
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Can you break from a Groovy “each” closure?

Is it possible to break from a Groovy .each{Closure} , or should I be using a classic loop instead? 6 Answers ...
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Can I run javascript before the whole page is loaded?

I want to run a bit of javascript before the whole page has loaded. Is this possible? Or does the code start to execute on </html> ? ...
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How to disable copy/paste from/to EditText

... application, there is a registration screen, where i do not want the user to be able to copy/paste text into the EditText field. I have set an onLongClickListener on each EditText so that the context menu showing copy/paste/inputmethod and other options does not show up. So the user won't be...