dependencies {
  compile fileTree(dir: 'libs', include: ['*.jar'])
  testCompile 'junit:junit:4.12'
  compile 'com.android.support:appcompat-v7:23.2.0'
  compile 'io.reactivex:rxjava:1.1.0'
  compile 'io.reactivex:rxandroid:1.1.0'
  compile 'com.squareup.retrofit2:retrofit:2.0.0-beta4'
  compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta4'
  compile 'com.squareup.retrofit2:adapter-rxjava:2.0.0-beta4'
  compile 'com.google.code.gson:gson:2.6.2'
  compile 'com.jakewharton:butterknife:7.0.1'
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context=".activity.MainActivity">

  <Button
    android:id="@+id/click_me_BN"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:padding="5dp"
    android:text="点我"
    android:textSize="16sp"/>
  <TextView
    android:id="@+id/result_TV"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@id/click_me_BN"
    android:text="Hello World!"
    android:textSize="16sp"/>
</RelativeLayout>

package com.queen.rxjavaretrofitdemo.activity;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Button;
import android.widget.TextView;

import com.queen.rxjavaretrofitdemo.R;

import butterknife.Bind;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class MainActivity extends AppCompatActivity {

  @Bind(R.id.click_me_BN)
  Button clickMeBN;
  @Bind(R.id.result_TV)
  TextView resultTV;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.bind(this);
  }

  @OnClick(R.id.click_me_BN)
  public void onClick() {
    getMovie();
  }

  //进行网络请求
  private void getMovie(){

  }
}

<uses-permission android:name="android.permission.INTERNET"/>

File cacheFile = new File(APP.getContext().getExternalCacheDir(),"ZhiBookCache");
    Cache cache = new Cache(cacheFile,1024*1024*50);
    Interceptor interceptor = new Interceptor() {
      @Override
      public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        if (!HttpUtils.isNetworkConnected(APP.getContext())) {
          request = request.newBuilder()
              .cacheControl(CacheControl.FORCE_CACHE)
              .build();
        }
        Response response = chain.proceed(request);
        if (HttpUtils.isNetworkConnected(APP.getContext())) {
          int maxAge = 0 * 60;
          // 有网络时 设置缓存超时时间0个小时
          response.newBuilder()
              .header("Cache-Control", "public, max-age=" + maxAge)
              .removeHeader("Pragma")// 清除头信息，因为服务器如果不支持，会返回一些干扰信息，不清除下面无法生效
              .build();
        } else {
          // 无网络时，设置超时为4周
          int maxStale = 60 * 60 * 24 * 28;
          response.newBuilder()
              .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)
              .removeHeader("Pragma")
              .build();
        }
        return response;
      }
    };
    client = new OkHttpClient.Builder().cache(cache)
        .addInterceptor(interceptor)
        .build();
    retrofit = new Retrofit.Builder()
        .baseUrl(RetrofitAPI.BASIC_DAILY)
        .addConverterFactory(GsonConverterFactory.create())
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
        .client(client)
        .build();
    retrofitAPI = retrofit.create(RetrofitAPI.class);

retrofitAPI.getDaily()
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(new Observer<DailyBean>() {
          @Override
          public void onCompleted() {

          }

          @Override
          public void onError(Throwable e) {
            Log.d(TAG,e.getMessage());
          }

          @Override
          public void onNext(DailyBean bean) {
            listener.onGetDailySuccess(bean);
          }
        });

@GET("news/latest")
Observable<DailyBean> getDaily();