title: Save byte array of image to file
body: <p>I try below code to get an URL file's thumbnail.</p>
  
  <pre><code>MediaMetadataRetriever mmr = new MediaMetadataRetriever();
  mmr.setDataSource(URL);
  byte[] image = mmr.getEmbeddedPicture(); 
  </code></pre>
  
  <p>I get the byte array(image) of thumbnail.
  And I want to save it as an image file.
  How can I do it?</p>