添加依赖

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compile 'com.squareup.retrofit:adapter-rxjava:2.0.0-beta1'
compile 'io.reactivex:rxandroid:1.0.1'

添加AddCallAdapterFactory

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Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://api.stay4it.com/")
        .addConverterFactory(GsonConverterFactory.create())
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
        .build();

返回Observable

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public interface APIService {
    @POST("list")
    Call<DessertItemCollectionDao> loadDessertList();
    @POST("list")
    Observable<DessertItemCollectionDao> loadDessertListRx();
}