title: Add emoji to Android keyboard
body: <p>I'm making my own custom keyboard and I have a problem with adding emoji to it. As a <code>android:keyIcon</code> I have a drawable of that emoji and I need <code>android:codes</code> for it. I don't know what to output when emoji is pressed. I've looked online for a solution, but I haven't found anything. Does anyone know what code should I use to output an emoji. Thanks in advance.</p>
  
  <p><strong>Here is a part of the xml code:</strong></p>
  
  <pre><code> &lt;Row&gt;
      &lt;Key android:codes="1F926" android:keyIcon="@drawable/e415" /&gt;
      &lt;Key android:codes="U+1F601" android:keyIcon="@drawable/e415" /&gt;
      &lt;Key android:codes="57430" android:keyIcon="@drawable/e0415" /&gt;
  &lt;/Row&gt;
  </code></pre>
  
  <p>When I click on first or second the output is empty and when I click on the second the output is some Chinese letter.</p>