title: ImageView Constructor usage
body: <p>There are several constructors available for defining an ImageView.
  For Example</p>
  
  <pre><code>1) public ImageView (Context context)
  2) public ImageView (Context context, AttributeSet attrs)
  3) public ImageView (Context context, AttributeSet attrs, int defStyle)** 
  </code></pre>
  
  <p>I am confused in using 2nd and 3rd type of constructor.
  basically i don't know what to pass in place of <strong>AttributeSet.</strong>
  Kindly provide a coding example.</p>