Android MVP learning and androidmvp Learning

Android MVP learning and androidmvp Learning

MVP -- Model View Presenter

This article by MartinFowler divides MVPs into SupervisingPresenter and PassiveView

MVP example in Android: https://github.com/antoniolg/androidmvp

Let's take a look at the project structure.

It can be seen that each function module contains XXActivity, XXView (Interface), XXPresenter (interface), XXPresenterImp

LoginView interface for logical processing

public interface LoginView {    public void showProgress();    public void hideProgress();    public void setUsernameError();    public void setPasswordError();    public void navigateToHome();}

LoginPresenter Interface

public interface LoginPresenter {    public void validateCredentials(String username, String password);}

LoginActivity implements the LoginView interface and corresponding methods. It contains a Presenter as the member variable. presenterImp calls the response method to update and synchronize the UI.

public class LoginActivity extends Activity implements LoginView, View.OnClickListener {    private ProgressBar progressBar;    private EditText username;    private EditText password;    private LoginPresenter presenter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_login);        progressBar = (ProgressBar) findViewById(R.id.progress);        username = (EditText) findViewById(R.id.username);        password = (EditText) findViewById(R.id.password);        findViewById(R.id.button).setOnClickListener(this);        presenter = new LoginPresenterImpl(this);    }    @Override public void showProgress() {        progressBar.setVisibility(View.VISIBLE);    }    @Override public void hideProgress() {        progressBar.setVisibility(View.GONE);    }    @Override public void setUsernameError() {        username.setError(getString(R.string.username_error));    }    @Override public void setPasswordError() {        password.setError(getString(R.string.password_error));    }    @Override public void navigateToHome() {        startActivity(new Intent(this, MainActivity.class));        finish();    }    @Override public void onClick(View v) {        presenter.validateCredentials(username.getText().toString(), password.getText().toString());    }}

LoginPresenterImp, which implements LoginPresenter

ublic class LoginPresenterImpl implements LoginPresenter, OnLoginFinishedListener {    private LoginView loginView;    private LoginInteractor loginInteractor;    public LoginPresenterImpl(LoginView loginView) {        this.loginView = loginView;        this.loginInteractor = new LoginInteractorImpl();    }    @Override public void validateCredentials(String username, String password) {        loginView.showProgress();        loginInteractor.login(username, password, this);    }    @Override public void onUsernameError() {        loginView.setUsernameError();        loginView.hideProgress();    }    @Override public void onPasswordError() {        loginView.setPasswordError();        loginView.hideProgress();    }    @Override public void onSuccess() {        loginView.navigateToHome();    }}

Throughout the project architecture, the logic processing and UI synchronization updates are separated from the Activity, making the code more concise.

I am not very familiar with MVP. I still need to look at more examples.

MVP improvement: blog