Coding the Interface
As mentioned earlier, the interface for any Android app is created through the use of a layout file. A layout file is an XML file that contains the XML used to create the objects and controls that the user can interact with. The first step in coding the HelloWorld app is to modify the layout so that it has some controls that the user can interact with. Your modifications will be simple. You will make the app take a name entered by the user and display Hello [entered name] after a button click.
Double-click the activity_hello_world.xml file in the layout folder of the Package Explorer to begin work coding the interface. If it is already open in the editor, click the activity_hello_world.xml tab at the top of the editor ( ...
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