title: Duplicate value issue in MultiAutoCompleteTextView
body: <p>I am new to android development and i am using MultiAutoCompleteTextView in my APP and following is code.</p>
  
  <pre><code>public TextView autoSelected;
  String[]    countries   =   {"India","USA","Canada","Indonesia","Belgium", "France", "Italy", "Germany", "Spain"};
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      MultiAutoCompleteTextView   autoCompleteTextView    =   (MultiAutoCompleteTextView)findViewById(R.id.autoCompleteTextView);     
  
      ArrayAdapter&lt;String&gt;    adapter     =   new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_dropdown_item_1line,countries);
      autoCompleteTextView.setAdapter(adapter);
      autoCompleteTextView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
  
  
  }
  </code></pre>
  
  <p><strong>First Problem and main problem</strong>
  TextView is getting duplicate values means same country is showing in TextView again and again. Example: i can select USA from autocomplete n number of times and it is showing n times in text field.</p>
  
  <p>I want if i already selected specific value from suggestion, in that case either it should not visible in suggestions or it should not be visible in TextView.</p>
  
  <p><strong>Second issue</strong></p>
  
  <p>I want to customize design of selected values that are currently in TextView like with background and close sign attached to it.</p>