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