一、問題描述

今天隨手寫一個post請求的時候，報錯了，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.ZygoteInit.main(ZygoteInit.java:749)
     Caused by: rx.exceptions.OnErrorNotImplementedException: @Field parameters can only be used with form encoding. (parameter #1)
        for method WatchAccountHttpService.getByBindNumber
        at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:386)
        at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:383)
        at rx.internal.util.ActionSubscriber.onError(ActionSubscriber.java:44)
        at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:152)
        at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:115)
        at rx.exceptions.Exceptions.throwOrReport(Exceptions.java:216)
        at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:139)
        at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:227)
        at rx.android.schedulers.LooperScheduler$ScheduledAction.run(LooperScheduler.java:107)
        	... 7 more
     Caused by: java.lang.IllegalArgumentException: @Field parameters can only be used with form encoding. (parameter #1)
        for method WatchAccountHttpService.getByBindNumber
        at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:720)
        at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:711)
        at retrofit2.ServiceMethod$Builder.parameterError(ServiceMethod.java:729)
        at retrofit2.ServiceMethod$Builder.parseParameterAnnotation(ServiceMethod.java:501)
        at retrofit2.ServiceMethod$Builder.parseParameter(ServiceMethod.java:333)
        at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:202)
        at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:166)
        at retrofit2.Retrofit$1.invoke(Retrofit.java:145)
        at java.lang.reflect.Proxy.invoke(Proxy.java:393)
        at $Proxy42.getByBindNumber(Unknown Source)
        at com.xtc.watch.net.watch.http.account.WatchAccountHttpServiceProxy.getByBindNumber(WatchAccountHttpServiceProxy.java:44)
        at com.xtc.watch.service.account.impl.WatchServiceImpl.getWatchAccountByBindNumberAsync(WatchServiceImpl.java:258)
        at com.xtc.watch.service.account.impl.WatchServiceImpl.getBindCheckInfoByBindNumber(WatchServiceImpl.java:273)
        at com.xtc.watch.view.account.bind.utils.BindNumberHelper.loadBindNumberInfo(BindNumberHelper.java:172)
        at com.xtc.watch.view.account.bind.utils.BindNumberHelper.resolveBindNumber(BindNumberHelper.java:132)
        at com.xtc.watch.view.account.bind.utils.BindNumberHelper.resolveBindNumber(BindNumberHelper.java:114)
        at com.xtc.watch.view.account.bind.BindAlbumPreviewActivity$5.call(BindAlbumPreviewActivity.java:285)
        at com.xtc.watch.view.account.bind.BindAlbumPreviewActivity$5.call(BindAlbumPreviewActivity.java:244)
        at rx.internal.util.ActionSubscriber.onNext(ActionSubscriber.java:39)
        at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:134)
        	... 9 more
 

二、分析和解決問題

2.1 分析問題

根據錯誤資訊，跟蹤錯誤堆疊，然後找到對應的Retrofit介面定義之處，如下所示：

    @POST("/watchaccount/bindnumber")
    Observable<HttpResponse<NetWatchAccount>> getByBindNumber(@Field("bindNumber") String bindNumber);

哎，當POST請求時，@FormUrlEncoded和@Field簡單的表單鍵值對。兩個需要結合使用，否則會報錯。 由於寫的太快了，把@FormUrlEncoded註解忘記了。

2.2 解決問題

在 @POST註解之上，加上@FormUrlEncoded註解即可。

    @FormUrlEncoded
    @POST("/watchaccount/bindnumber")
    Observable<HttpResponse<NetWatchAccount>> getByBindNumber(@Field("bindNumber") String bindNumber);

三、Retrofit註解

• 請求方法

• 請求引數

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