title: setting the background attribute to transparent in editext dynamically
body: <p>hi
  how to set edittext background attribute to transparent dynamically.</p>
  
  <pre><code>setBackgroundColor()
  setBackgroundDrawable()
  setBackgroundResource()
  </code></pre>
  
  <p>these options only available .
  how to set background totransparent with this methods.
  Please help me to solve this issue.</p>