title: Android studio and Protobuf integration
body: <p>I have a project that need to use protobuf (Getting the objects from server and parsing them).<br>
  For that I configured the following things:</p>
  
  <p><strong>Project level <code>gradle.build</code></strong></p>
  
  <pre><code>buildscript {
      repositories {
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:2.1.0'
          classpath 'com.google.protobuf:protobuf-gradle-plugin:0.7.0'
          classpath 'com.google.protobuf:protobuf-java:2.6.1'
      }
  }
  
  allprojects {
      repositories {
          jcenter()
          mavenCentral()
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <p><strong>App level <code>gradle.build</code></strong></p>
  
  <pre><code>apply plugin: 'com.android.application'
  apply plugin: 'com.google.gms.google-services'
  apply plugin: 'com.google.protobuf'
  
  android {
      ...
  }
  
  protobuf {
      protoc {
          artifact = 'com.google.protobuf:protoc:2.6.1'
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      testCompile 'junit:junit:4.12'
      compile 'com.android.support:appcompat-v7:23.4.0'
      compile 'com.android.support:design:23.4.0'
      compile 'com.google.protobuf:protobuf-java:2.6.1'
      compile 'com.google.protobuf:protobuf-gradle-plugin:0.7.0'
  }
  </code></pre>
  
  <p>I put my <code>proto</code> file under <code>.../app/src/main/proto/FILE.proto</code>.<br>
  Once i am trying to build the project I am getting the following error:</p>
  
  <pre><code>Error:Execution failed for task ':app:generateDebugProto'.
  &gt; protoc: stdout: . stderr: /Users/XX/YY/app/build/extracted-protos/main: warning: directory does not exist.
    /Users/XX/YY/app/build/extracted-include-protos/main: warning: directory does not exist.
    ...
    protoc-gen-javanano: program not found or is not executable
    --javanano_out: protoc-gen-javanano: Plugin failed with status code 1.
  </code></pre>
  
  <p>Any idea why is that? It should use the protoc from the repo and is should support that nano compilation.</p>
  
  <p>Thanks.</p>