【我的Android进阶之旅】使用Retrofit进行Post请求报错： @Field parameters can only be used with form encoding.

一、问题描述

今天随手写一个post请求的时候，报错了，如下所示：

09-28 11:11:28.155 10547-10547/com.xtc.watch E/Fatal: {CrashHandler.saveAndPrintLog-58} 
    java.lang.IllegalStateException: Exception thrown on Scheduler.Worker thread. Add `onError` handling.
        at rx.android.schedulers.LooperScheduler$ScheduledAction.run(LooperScheduler.java:112)
        at android.os.Handler.handleCallback(Handler.java:815)
        at android.os.Handler.dispatchMessage(Handler.java:104)
        at android.os.Looper.loop(Looper.java:207)
        at android.app.ActivityThread.main(ActivityThread.java:5981)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
        at com.android.internal.os.ZygoteIn