title: android ImageView set selector does not worked
body: <p>
  </p>
  
  <pre><code>&lt;item android:drawable="@drawable/chiduole_big" android:state_pressed="true"/&gt;
  &lt;item android:drawable="@drawable/chiduole"/&gt;
  </code></pre>
  
  <p>
  this is @drawable/image_selector</p>
  
  <p>xml code</p>
  
  <pre><code>&lt;ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:src="@drawable/image_selector"
              /&gt;
  </code></pre>