Quote:
Originally Posted by MatzeMatz
Am I doing something wrong with that tools? 
And how can I get (re-)compilable code or derive from a built-in class?
I currently don't get it:
How am I able to write own code which uses amazon's existing functionality and how do I compile it, that it works on the device?.
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No, you're not doing anything wrong. If you look at the compiled classes with a bytecode viewer, you'll see that all the parameters and variables are correctly id-ed (of course, otherwise the classes wouldn't be valid java classes) but that they are all named "a".
JAD and JD-GUI are both too stupid for such (slightly obfuscated) java classes as they rename all the variables without looking if there are any name clashes.
You'd need a decompiler that has the option of not trying to restore the "original" variable names.