android开发之--MVP模式

在android中使用MVP模式

目标

使用MVP模式实现登录效果

MVP介绍

M：Model负责存储、检索、操纵数据(有时也实现一个Model interface用来降低耦合);V：View interface需要View实现的接口，View通过View interface与Presenter进行交互，降低耦合，方便进行单元测试;P：Presenter作为View与Model交互的中间纽带，处理与用户交互的负责逻辑。

Activity只负责初始化，负责绘制UI元素、与用户进行交互

使用MVP的优势

以往的MVC模式已经不能满足随着界面及其逻辑的复杂度不断提升的，Activity类的职责不断增加，以致变得庞大臃肿，当我们的项目达到一定程度的时候管理起来也显得非常吃力，然而MVP模式中 View，它负责UI元素的初始化，建立UI元素与Presenter的关联（Listener之类），同时自己也会处理一些简单的逻辑（复杂的逻辑交由 Presenter处理），所以对于单元测试、功能升级也是非常的方便。

模拟登录Demo

m层，javaBean类：Info.javav层：LoginView.java、MainActivity.javap层：LoginPresenter.java、LoginPresenterCompl.java /** * Created by TangRen on 2016/8/15. */ public class Info { private String name; private String psw; public Info(String name, String psw) { super(); this.name = name; this.psw = psw; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPsw() { return psw; } public void setPsw(String psw) { this.psw = psw; } }

view接口

/** * Created by TangRen on 2016/8/15. */ public interface LoginView { public void onClearText(); public void onLoginResult(Boolean result, int code); }

presenter接口

/** * Created by TangRen on 2016/8/15. */ public interface LoginPresenter { public void doLogin(EditText name, EditText psw); public void clear(); }

presenter逻辑

/** * Created by TangRen on 2016/8/15. */ public class LoginPresenterCompl implements LoginPresenter { private LoginView loginView; private Info info; public LoginPresenterCompl(LoginView loginView) { super(); this.loginView = loginView; info = new Info("zhangsan", "1234"); } @Override public void doLogin(EditText name, EditText psw) { Log.d("doLogin---",name.getText().toString()); boolean result = false; int code = 0; String userName = name.getText().toString(); String password = psw.getText().toString(); if (userName.equals("") || password.equals("")) { result = false; code = 0; } else { if (userName.equals(info.getName()) && password.equals(info.getPsw())) { result = true; code = 1; } else { result = false; code = 2; } } Log.d("code",code+""); loginView.onLoginResult(result, code); } @Override public void clear() { loginView.onClearText(); } }

MainActivity

public class MainActivity extends AppCompatActivity implements LoginView { private EditText user, psw; private Button login, clear; private LoginPresenter mPresenter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { user = (EditText) findViewById(R.id.user); psw = (EditText) findViewById(R.id.psw); login = (Button) findViewById(R.id.login); clear = (Button) findViewById(R.id.clera); mPresenter = new LoginPresenterCompl(this); } public void click(View view) { switch (view.getId()) { case R.id.login: mPresenter.doLogin(user, psw); break; case R.id.clera: mPresenter.clear(); break; default: break; } } @Override public void onClearText() { user.setText(""); psw.setText(""); } @Override public void onLoginResult(Boolean result, int code) { if (!result&&code == 0) Snackbar.make(user, "User or Password not empt!", Snackbar.LENGTH_SHORT).show(); else if (code == 1) Snackbar.make(user, "Login success!", Snackbar.LENGTH_SHORT).show(); else Snackbar.make(user, "Login Fail!", Snackbar.LENGTH_SHORT).show(); } }

下载地址：http://download.csdn.net/detail/wu996489865/9603882