Android, iPhone, Symbian and Windows Mobile development learning material [closed]

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I would like to ask all of you if you know any good books, articles etc ... on development for these mobile platforms. I'm looking for learning mate开发者_运维技巧rial where the whole technology, OSes and development is discussed in great detail so i could gain a deeper understanding of the system as a whole. So any quick start tutorial and stuff like that does not count.

Major thanks for all your replies.

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I found the Android Developers website very useful http://developer.android.com/index.html

I am fairly new to Android myself, but I dissected and annotated their LunarLander example so I could build a framework for my game from it and so far so good!

If you have the time aswell check out Chris Pruetts talk from Google IO, I love this guy! http://www.youtube.com/watch?v=7-62tRHLcHk

Hope this helps

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Symbian books and resources: http://wiki.forum.nokia.com/index.php/Symbian_Resources_and_Books.

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Mark Murphy (a.k.a. commonsware on Stack Overflow) has written several books on Android development. The most appropriate for an experienced programmer new to the platform might be The Busy Coder's Guide to Android Development currently in its third edition. He seems to update publications regularly and therefore offers an annual subscription to all Commonsware publications, available in PDF, EPUB, and Kindle forms.

Also check out a Knol written by Mark wherein other resources are listed.