java - 从 ViewModel MutableLiveData 获取值并将它们显示在文本字段上

Question

我正在尝试掌握 Android 体系结构库，并且我一直在尝试通过 ViewModel 在我的 Main Activity 上使用 Mutable LiveData 显示改造后的文本，但我似乎做不到，我真的很感激一些帮助。

这是我的模型类

public class User {


@SerializedName("name")
@Expose
private String name;
@SerializedName("email")
@Expose
private String email;
@SerializedName("phone")
@Expose
private String phone;

public User() {
}

public String getUserName() {
    return name;
}

public void setUserName(String name) {
    this.name = name;
}

public String getUserEmail() {
    return email;
}

public void setUserEmail(String email) {
    this.email = email;
}

public String getUserPhone() {
    return phone;
}

public void setUserPhone(String phone) {
    this.phone = phone;
}

}

我的视图模型

public class UserViewModel extends AndroidViewModel {

  private NodeAuthService api;
  private SharedPreferences pref;

  private static MutableLiveData<List<User>> userDetails = new 
  MutableLiveData<>();


  private Call<List<User>> call;

  public UserViewModel(@NonNull Application application) {
    super(application);
    api = AuthRetrofitClient.getInstance().create(NodeAuthService.class);
  }
  private String email = pref.getString("email", "");

  public void loadUser(){
    call = api.getUser(email);
    call.enqueue(new Callback<List<User>>() {
        @Override
        public void onResponse(Call<List<User>> call, Response<List<User>> 
        response) {
            List<User> users =  response.body();
        }

        @Override
        public void onFailure(Call<List<User>> call, Throwable t) {
            Log.d("USER",t.getMessage());
        }
    });

  }

  public MutableLiveData<List<User>> getUserDetails(){
    return userDetails;
  }
}

我的 MainActivity 的简化版本

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    TextView navName = (TextView) findViewById(R.id.navigation_name);
    TextView navEmail = (TextView) findViewById(R.id.navigation_email);
}

请协助

标签： javaandroidmvvmandroid-livedataandroid-viewmodel

Answer 1

而不是这个

List<User> users =  response.body();

用这个

userDetails.postValue(response.body())

另外，在 livedata 之前删除静态

内部活动 oncreate() 初始化您的 viewModel 实例。然后viewModel.getUserDEtails().obsever(this, data-> // your stuff);