A single button to return to the main activity
<p>I started Android devlopment a few days ago and it's going great. I haven't coded a part because I didn't know the best way to do it. Here it goes :</p>

<p>I have multiple activities. My main activity has multiple buttons that use intents to display the concerned activities. I'd like to have a global button that reaches back to the main activity. This button should be accessible from all the other activities.</p>

<p>I'm not sure if there's a global toolbar or something I can do to avoid declaring the same button in different XML's.</p>

<p>Thanks </p>
