title: ButterKnife and AnnotationProcessor
body: <p>Based on <a href="https://github.com/JakeWharton/butterknife" rel="nofollow noreferrer">ButterKnife</a> lib, I upgrade to new version 8.5.1. I used</p>
  
  <pre><code>compile 'com.jakewharton:butterknife:8.5.1'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'
  </code></pre>
  
  <p>But it warns me in my Android Studio 2.3.  And ButterKnife doesn't work(cannot bind view). </p>
  
  <blockquote>
    <p>Warning:Using incompatible plugins for the annotation processing:
    android-apt. This may result in an unexpected behavior.</p>
  </blockquote>
  
  <p>I change  <strong>annotationProcessor</strong> to <strong>apt</strong> (I had plugin <code>apply plugin: 'com.neenbedankt.android-apt'</code> in my gradle) and it works as old version without warning (I used apt for old version 8.4.0)</p>
  
  <pre><code>compile 'com.jakewharton:butterknife:8.5.1'
  apt 'com.jakewharton:butterknife-compiler:8.5.1'
  </code></pre>
  
  <p>I think Android Studio 2.3 is incomatible with Annottaion processing. I searched and found to <strong>enable Annotation Processors in Android Studio 2.2 but cannot find in Android Studio 2.3</strong></p>
  
  <blockquote>
    <p>Settings > Build, Execution, Deployment > Compiler > Annotation
    Processors</p>
  </blockquote>
  
  <p>Anyone can explain this problem? Thanks!</p>