title: Android GridView DataBinding - ItemClickListener does not fire
body: <p>I've tried the following implementation for <code>GridView ItemClickListener</code>, the project are compiling fine, but when i clicks on <code>GridView</code> item, the <code>Toast</code> dont show my message, what's wrong ? </p>
  
  <p><strong>Java Click handler</strong></p>
  
  <pre><code>public class MultiChoiceActions {
  
      public void onItemClick(View view, int position, List&lt;FieldOption&gt; objectList) {
  
          boolean currentValue = objectList.get(position).isChecked();
          objectList.get(position).setChecked(!currentValue);
  
          Toast.makeText(view.getContext(), "!currentValue " + (!currentValue) , Toast.LENGTH_SHORT).show();
      }
  }
  </code></pre>
  
  <p><strong>XML Layout EDITED</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;layout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"&gt;
      &lt;data&gt;
          &lt;variable
              name="vm"
              type="br.com.viewluck.viewmodel.MultiChoiceViewModel"/&gt;
  
          &lt;variable
              name="adapter"
              type="br.com.viewluck.viewmodel.MultiChoiceAdapter"/&gt;
  
          &lt;variable
              name="actions"
              type="br.com.viewluck.viewmodel.MultiChoiceActions"/&gt;
      &lt;/data&gt;
  
      &lt;android.support.v7.widget.LinearLayoutCompat
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:layout_margin="2dp"
          android:orientation="vertical"&gt;
  
          &lt;android.support.v7.widget.AppCompatTextView
              android:id="@+id/txt_label"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:text="@{vm.fieldLabel}"
              android:textSize="14sp"
              android:textStyle="bold" /&gt;
  
          &lt;GridView
              android:id="@+id/gd_multiple_choice"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:choiceMode="multipleChoice"
              app:options="@{vm.objectList}"
              app:OnItemClickListener="@{(parent, view, position,id)-&gt;actions.onItemClick(view, position, vm.answer)}"
              android:numColumns="auto_fit" /&gt;
  
      &lt;/android.support.v7.widget.LinearLayoutCompat&gt;
  &lt;/layout&gt;
  </code></pre>
  
  <p>Any suggestion is appreciated!</p>