Android : how to edit the bar at the top of the screen?
<p>I'm beginning to learn Android Development and I have a bar at the top of my app, containing the title of the activity and the app icon. I want to know how to edit it (change the text, background color, etc), and remove it ? I also want to know how to edit the title of my app, because it's currently the name of its main activity...</p>

<p>Thanks a lot.</p>
