Android lets you specify screen layouts using XML elements inside an XML file, similar to designing screen layout for a webpage in an HTML file. Each file contains a whole screen or a part of a screen, and is compiled into a View resource that can be passed in to Activity.setContentView or used as a reference by other layout resource elements. Files are saved in the res/layout/ folder of your project, and compiled by the Android resource compiler, aapt.

Source file format: XML file requiring a <?xml version="1.0" encoding="utf-8"?> declaration, and a root element of one of the supported XML layout elements.

Resource file location: res/layout/some_/i/e.xml.

Compiled resource datatype: Resource pointer to a View (or subclass) resource. Resource reference name:


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