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Android tutorial for beginners:using Button, Listener and Toast

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This tutorials describes the usage of Buttons. we will start the course with a quick summary of the basic functions. What is a Listener?  A listener, as the name suggests, listens to a source until it is used.  For an action to be performed, it is necessary that a transmitter sends a signal to the listener that is triggered.  Action : Click on a button  Listener : Listen when the button is clicked  There is no simpler than that, we will see a  later in the examples how to implement a listener. Creating our project  As in the previous tutorial , with Eclipse and ADT, create a new project. We'll start by editing the "activity_main.xml" file located in the "res / layout" folder.  Its current syntax is as follows: <? xml version = "1.0" encoding = "utf-8" ?> <LinearLayout xmlns : android = "http://schemas.android.com/apk/res/android" android : orientation = "vertical" androi