MVP之登录

MVP

View和Model的交互都由Persenter完成(View和Model的接口都只在Personter中被调用)

• View 对应于Activity，负责View的绘制以及与用户交互
• Model 依然是业务逻辑和实体模型
• Presenter 负责完成View于Model间的交互

MVC与MCP的区别

MVC: View允许与View进行交互
MVP: Model与View之间的交互由Presenter完成，Presenter与View之间的交互是通过接口的

效果图

创建一个demo后,在main下先创建model,view,presenter三个文件夹

创建bean文件夹,并创建bean对象

public class User {    private String username;    private String password;    public User(String username, String password) {        this.username = username;        this.password = password;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }}

创建view和model的接口,先创建接口,再实现

model的登录接口

public interface IUserMode {    /**     * 登录     *     * @param user     * @return 约定返回"true"为登录成功，其他为登录失败的错误信息     */    String login(User user);}

view的登录接口

public interface IUserView {    /**     * 登录成功     */    void onLoginSuccess();    /**     * 登录失败     *     * @param error     */    void onLoginFailed(String error);}

创建presenter

public class UserPresenter {    private final IUserView userView;    private final UserMode userMode;    public UserPresenter(IUserView userView) {        this.userView = userView;        this.userMode = new UserMode();    }    /**     * 登录     *     * @param user     */    public void login(final User user) {        new Thread() {            @Override            public void run() {                final String res = userMode.login(user);                new Handler(Looper.getMainLooper()).post(new Runnable() {                    @Override                    public void run() {                        if ("true".equals(res)) {                            userView.onLoginSuccess();                        } else {                            userView.onLoginFailed(res);                        }                    }                });            }        }.start();    }}

创建view和model的实现类

model的登录实现类

public class UserMode implements IUserMode {    @Override    public String login(User user) {        boolean networkError = false; //网络是否异常        try {            Thread.sleep(3000);//模拟网络连接            if (networkError) {                return "网络异常";            } else if ("ethanco".equals(user.getUsername()) && "123456".equals(user.getPassword())) {                return "true";            } else {                return "账号或密码错误";            }        } catch (InterruptedException e) {            e.printStackTrace();            return e.getMessage();        }    }}

view的登录实现(MainActivity)

public class MainActivity extends AppCompatActivity implements IUserView, View.OnClickListener {    private UserPresenter userPresenter;    private EditText etUserName;    private EditText etPassword;    private ProgressDialog loginProgreess;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        etUserName = (EditText) findViewById(R.id.et_userName);        etPassword = (EditText) findViewById(R.id.et_password);        findViewById(R.id.btn_login).setOnClickListener(this);        userPresenter = new UserPresenter(this);    }    @Override    public void onLoginSuccess() {        loginProgreess.dismiss();        Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_SHORT).show();    }    @Override    public void onLoginFailed(String error) {        loginProgreess.dismiss();        Toast.makeText(getApplicationContext(), "登录失败:" + error, Toast.LENGTH_SHORT).show();    }    @Override    public void onClick(View v) {        String username = etUserName.getText().toString().trim();        String password = etPassword.getText().toString().trim();        if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password)) {            Toast.makeText(getApplicationContext(), "账号或密码不能为空", Toast.LENGTH_SHORT).show();            return;        }        loginProgreess = ProgressDialog.show(this, "登录", "正在登录...");        userPresenter.login(new User(username, password));    }}