java 不支持的操作：Android、Retrofit、OkHttp。在 OkHttpClient 中添加拦截器

Unsupported operation: Android, Retrofit, OkHttp. Adding interceptor in OkHttpClient

提问by Usman khan

I am trying to add token based authentication via Retrofit 2.0-beta3 and OkHttpClient in Android using interceptors. But I get UnsupportedOperationException when I add my interceptor in OkHttpClient. Here is my code: In ApiClient.java

我正在尝试使用拦截器在 Android 中通过 Retrofit 2.0-beta3 和 OkHttpClient 添加基于令牌的身份验证。但是当我在 OkHttpClient 中添加我的拦截器时，我得到了 UnsupportedOperationException。这是我的代码：在 ApiClient.java 中

public static TrequantApiInterface getClient(final String token) {
        if( sTreqantApiInterface == null) {

            Log.v(RETROFIT_LOG, "Creating api client for the first time");
            OkHttpClient okClient = new OkHttpClient();

            okClient.interceptors().add(new Interceptor() {
                @Override
                public Response intercept(Interceptor.Chain chain) throws IOException {
                    Request original = chain.request();

                    // Request customization: add request headers
                    Request.Builder requestBuilder = original.newBuilder()
                            .header("Authorization", token)
                            .method(original.method(), original.body());

                    Request request = requestBuilder.build();
                    return chain.proceed(request);
                }
            });

            Retrofit client = new Retrofit.Builder()
                    .baseUrl(baseUrl)
                    .client(okClient)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
            sTreqantApiInterface = client.create(TrequantApiInterface.class);
        }
        return sTreqantApiInterface;
    }

And I use it like:

我像这样使用它：

private void ampFreqTest(){
    String token = getSharedPreferences(getString(R.string.preference_file_key), Context.MODE_PRIVATE)
                        .getString(getString(R.string.key_token), "");

    service = ApiClient.getClient(token);
    //I get an exception on this line:
    Call<List<AmpFreq>> call = service.getUserAmpFreq("1");
    call.enqueue(new Callback<List<AmpFreq>>() {
        @Override
        public void onResponse(Response<List<AmpFreq>> response) {
            Toast.makeText(HomeScreen.this, "Got result", Toast.LENGTH_LONG);

            Log.v(ApiClient.RETROFIT_LOG, "Success api client." + response.message());
            Log.v(ApiClient.RETROFIT_LOG, "Success api client.");
        }
        @Override
        public void onFailure(Throwable t) {
            Toast.makeText(HomeScreen.this, t.getMessage() , Toast.LENGTH_LONG);
            Log.v(ApiClient.RETROFIT_LOG, "Fail api client." + t.getMessage() );
        }
    });
}

But I get this error:

但我收到此错误：

Process: com.trequant.usman.trequant_android, PID: 14400
java.lang.UnsupportedOperationException at java.util.Collections$UnmodifiableCollection.add(Collections.java:932)
 at com.trequant.usman.trequant_android.api.ApiClient.getClient(ApiClient.java:41)

It gives me error on adding a new interceptor saying that it is not modifiableCollection but the documentation for interceptors() function says: /**

添加新的拦截器时出现错误，说它不是可修改的Collection，但拦截器（）函数的文档说：/**

   * Returns a modifiable list of interceptors that observe the full span of each call: from before
   * the connection is established (if any) until after the response source is selected (either the
   * origin server, cache, or both).
   */

What am I doing wrong? Could it be a bug?

我究竟做错了什么？这可能是一个错误吗？

回答by Konrad Krakowiak

This issue occurs when you change Retrofit 2.0-beta2to Retrofit 2.0-beta3. You have to use builder if you want to create OkHttpClientobject.

当您将Retrofit 2.0-beta2更改为 Retrofit 2.0-beta3时会出现此问题 。如果要创建OkHttpClient对象，则必须使用 builder 。

Change :

改变 ：

 OkHttpClient okClient = new OkHttpClient();

 okClient.interceptors().add(new Interceptor() {
       @Override
       public Response intercept(Interceptor.Chain chain) throws IOException {
            Request original = chain.request();

            // Request customization: add request headers
            Request.Builder requestBuilder = original.newBuilder()
                    .header("Authorization", token)
                    .method(original.method(), original.body());

            Request request = requestBuilder.build();
            return chain.proceed(request);
        }
 });

to :

到 ：

 OkHttpClient okClient = new OkHttpClient.Builder()
           .addInterceptor(
               new Interceptor() {
                 @Override
                 public Response intercept(Interceptor.Chain chain) throws IOException {
                       Request original = chain.request();

                       // Request customization: add request headers
                       Request.Builder requestBuilder = original.newBuilder()
                               .header("Authorization", token)
                               .method(original.method(), original.body());

                       Request request = requestBuilder.build();
                       return chain.proceed(request);
                   }
               })
           .build();

It should resolve your problem.

它应该可以解决您的问题。

回答by Jimmy O. Rojas Medrano

Try this if the other answer doesn't work:

如果其他答案不起作用，请尝试此操作：

OkHttpClient okHttpClient = new OkHttpClient.Builder()
    .addInterceptor(new MyInterceptor())
    .build();
retrofit = new Retrofit.Builder()
    .baseUrl("http://google.com")
    .addConverterFactory(GsonConverterFactory.create())
    .client(okHttpClient)
    .build();

回答by Rahul Jain

You Can Add In this way also.

您也可以通过这种方式添加。

HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();

 Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("ENDPOINT_URL")
            .addConverterFactory(GsonConverterFactory.create()).client(client)
            .build();