title: How to zoom in a bitmap with high resolution?
body: <p>I am trying to implement an image viewer using <code>TouchImageView</code>.</p>
  
  <ul>
  <li><code>TouchImageView</code> is placed in a Fragment.</li>
  <li>And I set a large image(2500x3000) to this <code>TouchImageView</code>,
  (loading with inSampleSize=8). </li>
  <li>Then I pinch zoom-in the image, it is displayed at low resolution.(It's no wonder.)</li>
  </ul>
  
  <p>However, I want to display a high resolution image at zoom-in, like Android Gallery app. How to do this?</p>
  
  <p>Thanks in advance.</p>