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I would like to know if there is some standard code styling for Android(maybe a book?) (styling XML , Java programming , file naming , etc...)
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In Java, every variable declared has a scope. This means that the visibility and use of the variables must be restricted within the scope only. In case of a local variable, it is visible from the point of its declaration to the end of the method or code block it is declared in.
Purpose of Having Coding Standards: A coding standard gives a uniform appearance to the codes written by different engineers. It improves readability, and maintainability of the code and it reduces complexity also. It helps in code reuse and helps to detect error easily.
There is a good description of code style rules here.
If you want to enforce this rules without remembering all of them, and you are using eclipse then you can use formatting rules provided by Android team: android-formatting.xml. Just import it into eclipse using Preferences->Java->Code Style->Formatter, click Import.
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There is a ton of information available here: http://source.android.com/source/code-style.html
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