我如何在 OnResponse 函数之外使用 Retrofit 响应，以便我可以 return 使用推荐的架构模型？

Question

这个问题是 How can I use the Retrofit response outside the OnResponse function? 的后续问题，但我不能发表评论，所以我在这里问自己。

我正在尝试使用 Android Studio 登录模板，因为它遵循推荐的体系结构，但我在 return 在 LoginDataSource.login 中输入结果时遇到问题。结果被困在Call.enqueue函数中，我无法将其取出到return。我已经复制了上面 link 中建议的回调，但这只是将结果捕获在新的 class.

中

如何访问由我的服务器 return 编辑到我的存储库的 LoggedInUser return？

原始尝试：用户卡在 Call.enqueue - onResponse

public class LoginDataSource {
    public static Retrofit retrofit = null;
    LoggedInUser user;

    public Result<LoggedInUser> login(String username, String password) {
        user = new LoggedInUser();
        try {
            // TODO: handle loggedInUser authentication
            retrofit = new Retrofit.Builder()
                    .baseUrl("https://myserver")
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
            PostEndPoint endPoint = retrofit.create(PostEndPoint.class);
            Call<LoggedInUser> call = endPoint.getUser("login", username, password);

            call.enqueue(new Callback<LoggedInUser>() {
                @Override
                public void onResponse(Call<LoggedInUser> call, Response<LoggedInUser> response) {
                    Log.d(TAG, "onResponse: code " + response.code());
                    if (response.isSuccessful()){
                        callback.getUser();
                        user = response.body();
                        Log.d(TAG, "onResponse: " + user); // this returns valid user data
                    }
                }
            });

            Log.d(TAG, "retrofit complete:" + user.getName()); // this returns null

            return new Result.Success<>(user);
        }
    }
}

执行回调后：用户卡在 GetUserResponse - getUser

public class LoginDataSource {
    public static Retrofit retrofit = null;
    LoggedInUser user;

    public Result<LoggedInUser> login(String username, String password) {
        user = new LoggedInUser();
        try {
            // TODO: handle loggedInUser authentication
                retrofit = new Retrofit.Builder()
                        .baseUrl("https://myserver")
                        .addConverterFactory(GsonConverterFactory.create())
                        .build();
                PostEndPoint endPoint = retrofit.create(PostEndPoint.class);
                Call<LoggedInUser> call = endPoint.getUser("login", username, password);

                sendLoginRequest(call, new GetUserResponse(){
                    @Override
                    public void getUser(LoggedInUser userFromResponse) {
                        user = userFromResponse;
                    }
                });
                Log.d(TAG, "retrofit complete:" + user.getName()); // this returns null

            return new Result.Success<>(user);
        }
    }

    private void sendLoginRequest (Call call, final GetUserResponse callback) {
        call.enqueue(new Callback<LoggedInUser>() {
            @Override
            public void onResponse(Call<LoggedInUser> call, Response<LoggedInUser> response) {
                if (response.isSuccessful()){
                    callback.getUser(response.body());
                }
            }
        });
    }
}

public interface GetUserResponse {
    void getUser(LoggedInUser user);
}

我觉得我需要让用户发送登录请求 return，但我不知道该怎么做。我正朝着正确的方向前进吗？欢迎任何建议。

Answer 1

我一路切换到Kotlin，所以这可能不正确Java，但它显示了过程

设置用户模型为LiveData
使用 .postValue()
在视图模型（未显示）中为用户模型设置 observer

public class LoginDataSource {
    public static Retrofit retrofit = null;
    MutableLiveData<LoggedInUser> user=new MutableLiveData<>(); // changed this to LiveData so it can be observed from the viewmodel

    public Result<LoggedInUser> login(String username, String password) {
        user = new LoggedInUser();
        try {
            // TODO: handle loggedInUser authentication
            retrofit = new Retrofit.Builder()
                    .baseUrl("https://myserver")
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
            PostEndPoint endPoint = retrofit.create(PostEndPoint.class);
            loggedInUser = endPoint.getUser("login", username, password);
            user.postValue(loggedInUser); // updated the livedata here
        }
    }
}

我如何在 OnResponse 函数之外使用 Retrofit 响应，以便我可以 return 使用推荐的架构模型？

How can I use the Retrofit response outside the OnResponse function so I can return it up the recommended architecture model?

java

android

callback