title: My app is not working after proguard
body: <p>I'm new to proguard, and developing android app, after building with default android proguard config file(from sdk), nothing works, my assumption is related to code that finds resources on R file in runtime(yes ugly scanning file and search for resource id's).
  I couldn't understand from proguard documentation how to prevent a file from being proccessed by progurad.</p>
  
  <p>I think best way to learn why my app is failing is make proguard do nothing for start and then make it shrink specific stuff one by one.</p>
  
  <p>So what I wanna know is how can I tell proguard to keep all my classes (even the unreachable code)(Is this even possible?).</p>
  
  <p>and afterwards(hopfully my app wil work) telling him to shrink and obfuscate specific classes.</p>
  
  <p>The error I get is file not found exception when trying yo load dynamically the R$id file.</p>