title: How to fix these proguard warnings
body: <p>I am using a third party library in my project, since then proguard is issuing me these warnings, which I can't relate to that library, Here is the library I am using: <a href="https://github.com/OrangeGangsters/LolliPin" rel="nofollow noreferrer">Lollipin</a>.</p>
  
  <p><strong>Warnings I am getting</strong></p>
  
  <pre><code>Warning:android.databinding.DataBindingUtil: can't find referenced class android.databinding.DataBinderMapper
  Warning:android.databinding.ViewDataBinding: can't find referenced class android.databinding.DataBinderMapper
  Warning:there were 43 unresolved references to classes or interfaces.
  Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
  </code></pre>
  
  <p><strong>What I have tried?</strong></p>
  
  <p>I have edited <code>proguard-rules.pro</code> like this:</p>
  
  <pre><code>-keeppackagenames com.github.orangegangsters.lollipin
  </code></pre>
  
  <p>Still no go! I have also tried to clean and rebuild project that also didn't work out.</p>
  
  <p>Here is build.gradle:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
   android {
  compileSdkVersion 24
  buildToolsVersion '24.0.2'
  
  defaultConfig {
      applicationId "com.example.teach"
      minSdkVersion 15
      targetSdkVersion 24
      versionCode 27
      versionName "5.0"
  }
  buildTypes {
      release {
  
          minifyEnabled true
          shrinkResources true
          proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
      }
  
  }
  
  
  }
  
  dependencies {
  compile fileTree(include: ['*.jar'], dir: 'libs')
  
  compile 'com.android.support:appcompat-v7:24.2.1'
  compile('com.mikepenz:materialdrawer:5.6.0@aar') {
      transitive = true
  }
  compile ('com.github.orangegangsters:lollipin:2.0.0@aar') {
      transitive = true
  }
  
   compile 'com.google.android.gms:play-services-ads:9.6.0'
  
  
  }
  apply plugin: 'com.google.gms.google-services'
  </code></pre>