改造：自定义ErrorHandler，UndeclaredThrowableException

我使用'Retrofit'进行http转移。改造：自定义ErrorHandler，UndeclaredThrowableException

我做了一个自定义ErrorHandler像下面的代码。

public class CustomErrorHandler implements ErrorHandler { 

    @Override 
    public Throwable handleError(RetrofitError cause) { 

     if (RetrofitError.Kind.NETWORK == cause.getKind()) { 

      Throwable throwable = cause.getCause(); 

      if (throwable instanceof SocketTimeoutException) 
       return throwable; 
      else if (throwable instanceof ConnectException) 
       return throwable; 
     } 

     return cause; 
    } 

}

当我尝试调试，throwable是在CustomErrorHandler.handleError()SocketTimeoutException或ConnectException实例。

但是，下面的提示UndeclaredThrowableException。

private SignOutSuccessResponse trySignOut(String email, String userToken) throws Exception { 

    RestAdapter.Builder builder = new RestAdapter.Builder(); 
    builder.setEndpoint(ServerInfo.END_POINT_API); 
    builder.setErrorHandler(new CustomErrorHandler()); 

    if (BuildConfig.DEBUG) 
     builder.setLogLevel(RestAdapter.LogLevel.FULL); 

    API sessionAPI = builder.build().create(API.class); 
    return sessionAPI.signOut(email, userToken); 
}

如何解决此问题而不是this way？

我使用