title: Getting an error when I copy files image files to drawable
body: <p>I copied two images in the folder <code>drawable-hdpi</code>,<code>-ldpi</code>,<code>-mdpi</code> and referenced that image to a button.</p>
  
  <p>I'm getting following error in my console: <strong>" No resource found matching the give name"</strong>.</p>
  
  <p>What am I doing wrong?"hello" is the name of the image i referenced from the resource folder.i m getting the error the moment i add the image in the resource folder even before referencing the image to the button.</p>
  
  <pre><code> &lt;Button android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/button2" 
    android:text=""
    android:background="@drawable/hello"
     android:layout_x="190dp"
      android:layout_y="220dip"&gt;
      &lt;/Button&gt;
  </code></pre>