title: Android Filter multiple columns in TableView
body: <p>I have implemented the TableView from <a href="https://github.com/evrencoskun/TableView" rel="nofollow noreferrer">https://github.com/evrencoskun/TableView</a>.</p>
  
  <p>But i'm having some doubts about how to make my filter String with multiple columns filtering.</p>
  
  <p>I have a table with name, middle name, and last name, among other columns. 
  I need to filter my table with those fields.</p>
  
  <p>The documentation marks </p>
  
  <blockquote>
    <p>Multiple filtering combinations are supported such as COLUMN + WHOLE TABLE filter or MULTIPLE COLUMNS filter: e.g. "Happy" + "Boy" + all strings with a '-' character.</p>
  </blockquote>
  
  <p>but when i tried it does not work</p>
  
  <pre><code>override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
      val filter = et_first_name.text.toString() + '-' + et_middle_name.text.toString() + '-' + s.toString()
      filterTable(filter)
  }
  </code></pre>
  
  <pre><code>private fun filterTable(filter: String) {
      tableFilter.set(filter)
  }
  </code></pre>
  
  <p>My filter val ends up like <code>Jorge-Margarito-Martinez</code></p>
  
  <p>but it returns an empty list, whit an empty table</p>