Why is XML used for the creation of UI layouts in Android?

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Unlike what everyone said about the XML being easy and efficient. Here is what I read in Hello Android by Ed Brunnette (p. 49) which made sense.

Android is optimized for mobile devices with limited memory and
horsepower, so you may find it strange that it uses XML so
pervasively. After all, XML is a verbose, human-readable format not
known for its brevity or efficiency, right?

Although you see XML when writing your program, the Eclipse plug-in
invokes the Android resource compiler, aapt, to preprocess the XML
into a compressed binary format.**It is this format, not the original
XML text, that is stored on the device.

This was the kind of answer that i was looking for.(sorry if my question meant otherwise).

The reason that XML was chosen is mainly because of its familiarity and the number of IDE tools that natively support it. The developers could have chosen JSON for example and still compiled that to binary.The auto-generated R.java file is a helper for the IDE so that you can get the benefit of autocomplete when you want to access a resource.

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