升级到OkHttp3后，OkHttpClient抛出异常

I'm using following lines of code to add a default header to all of my requests sent using Retrofit2:

我正在使用以下代码行为我使用Retrofit2发送的所有请求添加默认标头:

private static OkHttpClient defaultHttpClient = new OkHttpClient();
static {
    defaultHttpClient.networkInterceptors().add(new Interceptor() {
        @Override
        public Response intercept(Chain chain) throws IOException {
            Request request = chain.request().newBuilder()
                    .addHeader("Accept", "Application/JSON").build();
            return chain.proceed(request);
        }
    });
}

After upgrading retrofit to beta-3 version, I had to upgrade OkHttp to OkHttp3 also (actually I just changed package names from okhttp to okhttp3, the library is included inside retrofit). After that I get exceptions from this line:

在将改造升级到beta-3版本之后,我还必须将OkHttp升级到OkHttp3(实际上我只是将包名称从okhttp更改为okhttp3,该库包含在改造中)。之后我从这一行得到例外:

defaultHttpClient.networkInterceptors().add(new Interceptor());

Caused by: java.lang.UnsupportedOperationException at java.util.Collections$UnmodifiableCollection.add(Collections.java:932)

引起:java.util.Collections的java.lang.UnsupportedOperationException $ UnmodifiableCollection.add(Collections.java:932)

Caused by: java.lang.ExceptionInInitializerError

引起:java.lang.ExceptionInInitializerError

What is the problem here?

这里有什么问题?

2 个解决方案

#1

You have to use builder if you want to create OkHttp(3)Client object.

如果要创建OkHttp(3)Client对象,则必须使用构建器。

Try change this:

尝试改变这个:

private static OkHttpClient defaultHttpClient = new OkHttpClient();

To something like this:

对于这样的事情:

  OkHttpClient defaultHttpClient = new OkHttpClient.Builder()
       .addInterceptor(
           new Interceptor() {
             @Override
             public Response intercept(Interceptor.Chain chain) throws IOException {
                   Request request = chain.request().newBuilder()
                   .addHeader("Accept", "Application/JSON").build();
               return chain.proceed(request);
              }
           }).build();

#2

compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile "com.squareup.retrofit2:converter-gson:2.1.0"
compile "com.squareup.retrofit2:adapter-rxjava:2.1.0"
compile 'com.squareup.okhttp3:logging-interceptor:3.4.0'

You should probably use these versions. Just put them, sync your gradle, delete all imports, and try again.

你应该使用这些版本。只需放置它们,同步您的gradle,删除所有导入,然后重试。

import okhttp3.Interceptor;

import okhttp3.OkHttpClient;

import okhttp3.Request;

import okhttp3.Response;

import okhttp3.logging.HttpLoggingInterceptor;

import retrofit2.Retrofit;

import retrofit2.converter.gson.GsonConverterFactory;

#1