Automatic calculation
<p>I'm making an app where i want to automatically make an calculation.</p>

<p>the numbers <strong>1 and 2</strong> are <strong>EditText</strong>, number <strong>3</strong> is a <strong>TextView</strong>.
when i fill in the numbers <strong>1 and 2</strong>, i want it to <strong>automatically sum up</strong> and show a result in the <strong>TextView</strong>. in this example 1+2=3</p>

<p><strong>How to set up an activity for this</strong></p>

<p>i made an xml example:</p>

<p><img src="http://i.stack.imgur.com/aKTB3.png" alt="enter image description here"></p>
