title: how to convert an apk file to jar
body: <p>I have an apk application but it's not working on my mobile?
  And I tried it to convert by following steps:</p>
  
  <ol>
  <li>I downloaded an apk file on my computer.</li>
  <li>then I converted it to jar by dex2jar?</li>
  <li>but it didn't worked on my mobile and a message shows "Invalid file". </li>
  <li>then I open it in jd-gui and then save it to src file.</li>
  <li>then I open it but all file shows as .java file.
  How to open it on my mobile?
  How to convert it to .class? 
  My mobile name is: samsung <strong>gt-s3653</strong>  </li>
  </ol>