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動態變化URL的Android實現HostSelectionInterceptor我只瞭解我怎麼能實現Retrofit與Dagger2設置動態變更網址這個reference

我儘量讓單模與HostSelectionInterceptor類使用上Dagger2 ，但我不能做出正確的和我得到的錯誤：

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模塊：

@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; 
    } 
} 

現在我得到這個錯誤：

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

問題是由setHost方法在這行代碼設置的主機：

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

Answer 1

基於this github comment，解決的辦法是更換

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

與

 HttpUrl newUrl = HttpUrl.parse(host);