I'm new to Java (I'm catching on) and developing for Android and I'm not sure how to put what is about to be explained into Java code.
I am making an app that takes text and makes it into a scrambled code that can later be unscrambled. What I can't figure out is, for example: take the letter A and make it the letter M. And so on with the rest of the letters. So that if someone typed "I am hiding" the app would turn it into "U my tupus". Then the same app on a different device could decode "U my tupus" back into "I am hiding".

Char.valueOf(Integar.parseInt('A') + <howevermanytom>);

Use a Hash Map.

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String alphabet = "abcdefghijklmnopqrstuvwxyz";
String encodedAlphabet = "mnopqrstuvwxyzabcdefghijkl";
HashMap<String, String> cypher = new HashMap<String, String>();

for(int i = 0; i < alphabet.length(); i++) {
   cypher.put(alphabet.substring(i, i+1), encodedAlphabet.substring(i, i+1));
}

etc....


Then you use

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cypher.get("a")

and it will give you a M whenever you are doing your parsing.
HashMap Java API