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Simple Text Messages

I'm trying to do the extra credit task to send simple text messages in the Ribbit app. So far I've added a button in the action bar to bring the user to a new activity. I've made a xml layout that has a EditText and a button. I'm not sure on what to add into my new java activity now. I want to make it so when a user adds input into the editText and sends it. They can pick a recipient and send the message to that user. Can anybody explain how I can add this into my app?