ANDROID MVP交互器与MVVM存储库

// View接口
public interface MainView {
    void showData(String data);
}

// Presenter
public class MainPresenter {
    private MainView view;
    private Model model;

    public MainPresenter(MainView view, Model model) {
        this.view = view;
        this.model = model;
    }

    public void fetchData() {
        String data = model.getData();
        view.showData(data);
    }
}

// View实现
public class MainActivity extends AppCompatActivity implements MainView {
    private MainPresenter presenter;

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

        Model model = new Model();
        presenter = new MainPresenter(this, model);
        presenter.fetchData();
    }

    @Override
    public void showData(String data) {
        TextView textView = findViewById(R.id.textView);
        textView.setText(data);
    }
}

// ViewModel
class MainViewModel : ViewModel() {
    private val _data = MutableLiveData<String>()
    val data: LiveData<String> get() = _data

    fun fetchData() {
        val data = Model.getData()
        _data.value = data
    }
}

// Activity
class MainActivity : AppCompatActivity() {
    private lateinit var viewModel: MainViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        viewModel = ViewModelProvider(this).get(MainViewModel::class.java)

        viewModel.data.observe(this, Observer {
            textView.text = it
        })

        viewModel.fetchData()
    }
}