title: EditText event handler to get notified that a key has been pressed
body: <p>App need to know when a new key has been pressed during EditText is been used, filled. Is it any event hadler for it? In iOS for <code>UITextField</code> the <code>shouldChangeCharactersInRange</code> delegate method is been used.</p>
  
  <pre><code>&lt;EditText
          android:layout_width="wrap_content"
          android:layout_height="30dp"
          android:id="@+id/editText"
          android:layout_alignParentBottom="false"
          android:layout_alignParentLeft="true"
          android:layout_alignParentStart="true"
          android:layout_alignParentTop="true"
          android:layout_marginTop="18dp"
          android:layout_marginLeft="8dp"
          android:width="100dp"
          android:on/&gt; &lt;----- some event handler need here but only onclick I see
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/yKrPv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yKrPv.png" alt="enter image description here"></a></p>