title: Background Tint of a button is showing only on Android 5.1.1
body: <p>I am trying to change the <code>backgroundTint</code> of a <code>button</code> in <code>android</code>.</p>
  
  <p>When I change it I see it on <code>Android Studio</code>, but when I open the <code>emulator</code>(4.4) the <code>backgroundTint</code> is not showing .</p>
  
  <p>But when I change the <code>background</code> its show normally on the <code>emulator</code>.</p>
  
  <p>Also, some <code>button</code> showing in a different size than the <code>Android Studio</code> is showing</p>
  
  <p>I figure out that the backgroundTint is only accepted on android 5.1.1 not even on 5.0 , how can I fix it?</p>