title: GCM not working for release apk
body: <p>Before any one marks this as a duplicate, I have been through every related documents and questions in Stack Overflow but I could not get my exact solution for my problem.</p>
  
  <p>GCM for release apk works with other devices but does not work in Sony Xperia Z5 with Android version 7. Every other devices works fine.</p>
  
  <p>I have tried with OnePlus 3 with Android version 7 and it works. The problem exists only with Sony Xperia Z5 (Nougat).</p>
  
  <p>In my caseIi have checked all GCM key and tried with SHA1 fingerprint as recommended by few answers in Stack Overflow.</p>
  
  <p>I have tried adding few lines in ProGaurd file as recommended in <a href="https://stackoverflow.com/questions/32132647/gcm-registration-works-for-debug-apk-but-not-release-apk">GCM registration works for debug APK but not release APK</a>.</p>
  
  <p>But nothing is working for me. </p>