August 2016
Intermediate to advanced
412 pages
9h 3m
English
Content preview from Android High Performance ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Dalvik Virtual Machine
Each Android application runs in its own process inside a virtual machine called Dalvik. As we have seen, programs are typically written in Java and then compiled to bytecode. From the bytecode (.class files) they are afterwards transformed into DEX format, commonly using a special tool provided by the Android SDK called
dx. This DEX format is more optimized and designed to have a smaller memory footprint in comparison with normal Java .class files, since mobile devices lack the computational capabilities of desktops. This is achieved through compression and merging/optimization of the multiple .class files.
Note
It is not completely accurate that the coding has to be strictly done in Java. Android allows using native code ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.