title: Remove unused functions from google play services
body: <p>I am using google play services in my project only for GCM. I got the following error when I updated my google play services library</p>
  
  <pre><code>[2015-12-04 14:50:10 - MyGame] Dx 
  trouble writing output: already prepared
  [2015-12-04 14:50:14 - Dex Loader] Unable to execute dex: method ID not in [0, 0xffff]: 65536
  [2015-12-04 14:50:14 - MyGame] Conversion to Dalvik format failed: Unable to execute dex: method ID not in [0, 0xffff]: 65536
  </code></pre>
  
  <p>On googling I found that this error was thrown because my dex file exceeded the limit.I do not want to split my dex file. Can anyone tell me how to remove unused functions. I do not see much suggestion for doing this using eclipse.</p>
  
  <p>I have seen people suggesting to use proguard, but somehow this is not working for me. It might be because I am not all that familier with using proguard. </p>
  
  <p>Please help.</p>