Retrofit - 基础url必须以/结尾

Question

我已经尝试了这个网站上所有可能的解决方案。我以前使用过retrofit并已经解决了那个问题，但这次我无法解决它。我正在使用StackOverflow API获取问题及其详细信息。

API： https://api.stackexchange.com/2.2/questions?order=asc&sort=votes&site=stackoverflow&tagged=android&filter=withbody 我使用的调用方法：

    @GET
    Call<Item> getAllQuestionsInformation(@Url String url);

我的Retrofit实例代码，带有日志拦截器：

        String url="https://api.stackexchange.com/2.2/questions?order=asc&sort=votes&site=stackoverflow&tagged=android&filter=withbody/";
        builder=new OkHttpClient.Builder();
        HttpLoggingInterceptor httpLoggingInterceptor=new HttpLoggingInterceptor();
        httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        builder.addInterceptor(httpLoggingInterceptor);
        Retrofit retrofit=new Retrofit.Builder()
                .baseUrl(url)
                .addConverterFactory(GsonConverterFactory.create())
                .client(builder.build())
                .build();
        allApiService=retrofit.create(AllApiService.class);
        final Call<Item> itemCall=allApiService.getAllQuestionsInformation(url);
        itemCall.enqueue(new Callback<Item>() {
            @Override
            public void onResponse(Call<Item> call, Response<Item> response) {
                Log.v("Info",""+response.body().getTitle());
                questionTitleArrayList.add(response.body().getTitle());
            }

            @Override
            public void onFailure(Call<Item> call, Throwable t) {
                Log.v("Error",""+t.getMessage());
            }
        });

我遇到的错误：

java.lang.RuntimeException: Unable to start activity ComponentInfo{app.shakil.com.retrofit_paginationrecyclerview/app.shakil.com.retrofit_paginationrecyclerview.MainActivity}: java.lang.IllegalArgumentException: baseUrl must end in /: https://api.stackexchange.com/2.2/questions?order=asc&sort=votes&site=stackoverflow&tagged=android&filter=withbody/
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: java.lang.IllegalArgumentException: baseUrl must end in /: https://api.stackexchange.com/2.2/questions?order=asc&sort=votes&site=stackoverflow&tagged=android&filter=withbody/
        at retrofit2.Retrofit$Builder.baseUrl(Retrofit.java:513)
        at retrofit2.Retrofit$Builder.baseUrl(Retrofit.java:456)
        at app.shakil.com.retrofit_paginationrecyclerview.MainActivity.getQuestionInformationWithTitle(MainActivity.java:57)
        at app.shakil.com.retrofit_paginationrecyclerview.MainActivity.onCreate(MainActivity.java:36)
        at android.app.Activity.performCreate(Activity.java:7136)
        at android.app.Activity.performCreate(Activity.java:7127)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:193) 
        at android.app.ActivityThread.main(ActivityThread.java:6669) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

- Sakhawat Hossain

Answer 1

.baseUrl() 是 https://api.stackexchange.com/2.2/，其中包括 API 版本，每个请求的版本应该相同，并且更新到新的 API 版本也更轻松。请求应该大致如下所示：

@GET("questions")
Call<Items> getQuestions(
    @Query(value = "order")  String sortOrder,
    @Query(value = "sort")   String sortField,
    @Query(value = "site")   String site,
    @Query(value = "tagged") String tagged,
    @Query(value = "filter") String filter
);

response.body().getTitle() 看起来不正确，因为响应 JSON 的根节点是 items，它没有标题...所以您可能需要映射到 Items 和 Item 类。

- Martin Zeitler

---

谢谢你的帮助。现在我明白了我的问题所在，原来是参数缺失。我按照你建议的编码，一切都正常工作了。 - Sakhawat Hossain

Answer 2

你的基本网址是https://api.stackexchange.com/2.2/。

在GET中也应该这样做：@GET(questions) 访问此链接 "Original Answer"翻译成"最初的回答"

- Ali dashti