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动态变化URL的Android实现HostSelectionInterceptor我只了解我怎么能实现Retrofit与Dagger2设置动态变更网址这个reference

我尽量让单模与HostSelectionInterceptor类使用上Dagger2 ，但我不能做出正确的和我得到的错误：

我NetworkModule：

@Module(includes = ContextModule.class) 
public class NetworkModule { 
    @Provides 
    @AlachiqApplicationScope 
    public HttpLoggingInterceptor loggingInterceptor() { 
     HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() { 
      @Override 
      public void log(String message) { 
       Timber.e(message); 
      } 
     }); 
     interceptor.setLevel(HttpLoggingInterceptor.Level.BASIC); 
     return interceptor; 
    } 

    ... 

    @Provides 
    @AlachiqApplicationScope 
    public HostSelectionInterceptor hostSelectionInterceptor() { 
     return new HostSelectionInterceptor(); 
    } 

    @Provides 
    @AlachiqApplicationScope 
    public OkHttpClient okHttpClient(HostSelectionInterceptor hostInterceptor, HttpLoggingInterceptor loggingInterceptor, Cache cache) { 
     return new OkHttpClient.Builder() 
       .addInterceptor(hostInterceptor) 
       .addInterceptor(loggingInterceptor) 
       .connectTimeout(30, TimeUnit.SECONDS) 
       .writeTimeout(30, TimeUnit.SECONDS) 
       .readTimeout(30, TimeUnit.SECONDS) 
       .cache(cache) 
       .build(); 
    } 
} 

和HostSelectionInterceptor模块：

@Module(includes = {NetworkModule.class}) 
public final class HostSelectionInterceptor implements Interceptor { 
    private volatile String host; 

    @Provides 
    @AlachiqApplicationScope 
    public String setHost(String host) { 
     this.host = host; 
     return this.host; 
    } 

    public String getHost() { 
     return host; 
    } 

    @Provides 
    @AlachiqApplicationScope 
    @Override 
    public okhttp3.Response intercept(Chain chain) { 
     Request request = chain.request(); 
     String host = getHost(); 
     if (host != null) { 
      HttpUrl newUrl = request.url().newBuilder() 
        .host(host) 
        .build(); 
      request = request.newBuilder() 
        .url(newUrl) 
        .build(); 
     } 
     try { 
      return chain.proceed(request); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

     return null; 
    } 
} 

现在我得到这个错误：

java.lang.IllegalArgumentException: unexpected host: http://myUrl.com/ at okhttp3.HttpUrl$Builder.host(HttpUrl.java:754)

问题是由setHost方法在这行代码设置的主机：

HttpUrl newUrl = request.url().newBuilder() 
     .host(host) 
     .build(); 

Answer 1

基于this github comment，解决的办法是更换

 HttpUrl newUrl = request.url().newBuilder() 
       .host(host) 
       .build(); 

与

 HttpUrl newUrl = HttpUrl.parse(host);