title: I want to concat two strings for a TextView in android, Data Binding Api
body: <p>Im using <code>DataBinding</code> Api for setting the views in android layouts. Here is my layout.</p>
  
  <p>layout.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
   &lt;layout xmlns:android="http://schemas.android.com/apk/res/android"&gt;
    &lt;data&gt;
      &lt;variable name="user" type="testing.sampleapp.com.sampleapp.User"/&gt;
    &lt;/data&gt;
  &lt;LinearLayout
      android:orientation="vertical"
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
      &lt;TextView android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="@{ "Hello " + user.firstName}"/&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p></p>
  
  <p>I want the TextView to display <strong>Hello UserName</strong>. How to achieve this using the data binding api.</p>