title: Add shadow to button in android
body: <p>I'm trying to add some kind of shadow over image button on click. Is it possible and how.</p>
  
  <p>So i have button and i wished it would look pushed when i click it. So i created new xml like that:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
  &lt;item
      android:state_pressed="true"
      android:state_enabled="true"
      android:drawable="@color/btn_pushed" 
       /&gt;
  &lt;item
      android:drawable="@drawable/btn" /&gt;
  &lt;/selector&gt;
  </code></pre>
  
  <p>Ok it works fine, but i have like 50 buttons and i have to make new image for all of them. That's a lot of work, is it possible to just add some kind of shadow over it? Or something so that it will look pushed?</p>