I need to encode the sending messages/data(not MD5)and then they will be decoded on the other side. Codes have to be in android libraries not in java. Is there any code or information that may help me around internet? Thx all for your help.

Well here is news for you Android is based on Java therefore if there is some process of "encode-decode" it will be Java based. By-the-way I believe you mean encrypt-decrypt since encoding is just saying which set of characters to use sample: UTF-8

You are more then welcome to use other language like C, C++, Scala, Clojure, Python to write your Android application which is possible, but it is far longer process

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