After completing the previous lesson , you have an app that shows an activity (a single screen) with a text field and a button. In this lesson, you’ll add some code to MainActivity that starts a new activity when the user clicks the Send button. This …
https://developer.android.com/training/basics/firstapp/starting-activity.html
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* Respond to the send button
* Build an Intent
* Create the second activity
* Add a text view
* Display the message
* Add up navigation
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