Modify Android Internal Class(es) / Call Handling

Since the whole android stuff is open source i was thinking about to do some minor modifications in a few internal classes from the Internal. Telephony package and of course then i would love if somehow my application could use the modified classes. I was thinking about replacing the classes with the original ones at runtime by using reflection or other kind of unknown java tricks. Maybe what i'm trying to do is impossible.

Note: the changes in the internal classes would not change their functionality in any way, its more about extending their functionality so even if other apps would use the modified versions it would not break them!

Why i want to do it? What i'm trying to achieve ? Well i would like to modify the Internal. Telephony. Gsm. Calltracker internal class so i could do proper call handling (call blocking etc. ) Maybe if you know about another way how to do what i want to i would like to hear about it :)

Note2: i know about the method when you handle the android. Intent. Action. Phone_state, action , but its simply too late to react when this action is broadcasted.

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