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Is it possible to change at runtime the behaviour of a method from a class already loaded using Dexmaker, by proxing or generating code?
UPDATE
Just a remark: I want to add a method/modify existing one from my own application, not from the android framework.
No. It is not possible.
You could create a new class that extends the original, or possibly even make a copy of the class, with a new name and a tweaked implementation. But you can’t replace an existing class.
Your best bet is probably to extract out the code that you might want to modify into a separate class, and then pass in an instance of that class to whatever uses it. And then, if you need to create a new implementation, you can subclass it and pass in the subclass instead.