title: Android can not resolve subscribe method in rxjava
body: <p>Im tring to use rxjava with retrofit in android studio. In fact i followed this <a href="https://code.tutsplus.com/tutorials/getting-started-with-retrofit-2--cms-27792" rel="nofollow noreferrer">https://code.tutsplus.com/tutorials/getting-started-with-retrofit-2--cms-27792</a> tutorial 
  This is what everything that I did:</p>
  
  <pre><code>compile 'com.android.support:appcompat-v7:25.1.0'
      compile 'com.android.support.constraint:constraint-layout:1.0.2'
      testCompile 'junit:junit:4.12'
      compile 'com.squareup.retrofit2:retrofit:2.2.0'
      compile 'com.google.code.gson:gson:2.8.0'
      compile 'com.squareup.retrofit2:converter-gson:2.2.0'
      compile 'com.android.support:recyclerview-v7:25.1.0'
      compile 'com.squareup.retrofit2:adapter-rxjava2:2.2.0'
      compile 'io.reactivex.rxjava2:rxjava:2.0.9'
      compile 'io.reactivex:rxandroid:1.2.1'
      compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
      compile 'com.jakewharton.retrofit:retrofit2-rxjava2-adapter:1.0.0'
  </code></pre>
  
  <p>And i created Retrofit client and Interface subscribe method. It says cann't be resolve</p>
  
  <pre><code>mService.getAnswer().subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread())
               .subscribe(new Subscriber&lt;SOAnswersResponse&gt;() {
                              @Override
                              public void onCompleted() {
  
                              }
  
                              @Override
                              public void onError(Throwable e) {
  
                              }
  
                              @Override
                              public void onNext(SOAnswersResponse soAnswersResponse) {
  
                              }
  
  
         }
           );
  </code></pre>
  
  <p>I imported this in my main activity:</p>
  
  <pre><code>import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.support.v7.widget.DividerItemDecoration;
  import android.support.v7.widget.LinearLayoutManager;
  import android.support.v7.widget.RecyclerView;
  
  import android.widget.Toast;
  
  import com.example.android.stackoverflow.Data.Model.Item;
  
  import com.example.android.stackoverflow.Data.Model.SOAnswersResponse;
  import com.example.android.stackoverflow.Data.remote.ApiUtils;
  import com.example.android.stackoverflow.Data.remote.SOService;
  
  
  import java.util.ArrayList;
  
  
  import io.reactivex.schedulers.Schedulers;
  import io.reactivex.android.schedulers.AndroidSchedulers;
  import rx.Subscriber;
  </code></pre>