title: Apk installation fails in phonegap
body: <p>I am working on phonegap project. I have one apk file which is working fine and installing properly on android device, but I want to do some modification in that apk file, for that what i am doing is, just renaming it's extention from apk to zip and simply extracting it, and doing some changes in HTML file which is located at asset/www folder. And after modifying all necessary changes again compressing that folder back to zip and again back to apk. I just want to install that modified apk file onto android device. But while installing it is parsing properly but getting error Apk not installed, I think I am getting this error because that modified apk is not signed and zipalign.</p>
  
  <p>So my main question is, how can i signed my apk using jarsigner and zipalign mechanism is there any java code or command so that i can achieve this?</p>