使用Rxjava+Retrofit时出错

Question

楼主是萌新，在使用Rxjava2+retrofit2时编译完成之后会报错：

Caused by: java.lang.IllegalArgumentException: Unable to create call adapter for io.reactivex.Observablefor method NewsService.getUser

依赖：

compile 'io.reactivex.rxjava2:rxjava:2.0.4'
compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
compile 'com.squareup.okhttp3:okhttp:3.5.0'
compile 'com.google.code.gson:gson:2.8.0'
compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:adapter-rxjava:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'

部分代码：

Retrofit retrofit = new Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.baseUrl("http://takeapp.com.cn/Home/register/")
.build();
NewsService api = retrofit.create(NewsService .class);
api.getUser("13222222222",MD5Tool.md5("123"));
Service类接口：
@POST("login")
Observable getUser(@Field("phone_num") String username,
@Field("password") String password);

请问要如何解决

Answer 1

http://blog.csdn.net/wbwjx/article/details/52082020