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How to detect when an Android app goes to the background and come back to the foreground
I am trying to write an app that does something specific when it is brought back to the foreground after some amount of time. Is there a way to detect when an app is sent to the background or brought to the foreground?
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Site stopped working in asp.net System.Web.WebPages.Razor.Configuration.HostSection cannot be cast t
I have a problem like this on server
9 Answers
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Find element's index in pandas Series
I know this is a very basic question but for some reason I can't find an answer. How can I get the index of certain element of a Series in python pandas? (first occurrence would suffice)
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unique object identifier in javascript
... do some experiment and I need to know some kind of unique identifier for objects in javascript, so I can see if they are the same. I don't want to use equality operators, I need something like the id() function in python.
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Play sound on button click android
How do I get a button to play a sound from raw when click? I just created a button with id button1 , but whatever code I write, all is wrong.
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Is it better practice to use String.format over string Concatenation in Java?
Is there a perceptible difference between using String.format and String concatenation in Java?
14 Answers
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strdup() - what does it do in C?
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Exactly what it sounds like, assuming you're used to the abbreviated way in which C and UNIX assigns words, it duplicates strings :-)
Keeping in mind it's actually not part of the ISO C standard itself(a) (it's a POSIX thing), it's effectively doing the same as the following code:
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Fastest way to tell if two files have the same contents in Unix/Linux?
...do this a for a lot of files, and in my script the diff command seems to be the performance bottleneck.
9 Answers
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Java Immutable Collections
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Unmodifiable collections are usually read-only views (wrappers) of other collections. You can't add, remove or clear them, but the underlying collection can change.
Immutable collections can't be changed at all - they don't wrap anot...
How do you find all subclasses of a given class in Java?
How does one go about and try to find all subclasses of a given class (or all implementors of a given interface) in Java?
As of now, I have a method to do this, but I find it quite inefficient (to say the least).
The method is:
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