android+使用mvp做一个简单的登录

model包内

IUserMode接口类

package model;import bawei.com.denglu.User;/** * Created by Administrator on 2017/11/1. */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);}

UserMode类（实现接口）
package model;import bawei.com.denglu.User;/** * Created by Administrator on 2017/11/1. */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包下
IUserView接口类
package view;/** * Created by Administrator on 2017/11/1. */public interface IUserView {    /**     * 登录成功     */    void onLoginSuccess();    /**     * 登录失败     *     * @param error     */    void onLoginFailed(String error);}presenter包下 
UserPresenter类
package presenter;import android.os.Handler;import android.os.Looper;import bawei.com.denglu.User;import model.UserMode;import view.IUserView;/** * Created by Administrator on 2017/11/1. */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();    }}
User类
package bawei.com.denglu;/** * Created by Administrator on 2017/11/1. */public class User {    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;    }    private String username;    private String password;}
MainActivity类
package bawei.com.denglu;import android.app.ProgressDialog;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.text.TextUtils;import android.view.View;import android.widget.EditText;import android.widget.Toast;import presenter.UserPresenter;import view.IUserView;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));    }}
activity_main类
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"    android:layout_width="match_parent" android:layout_height="match_parent"    tools:context="bawei.com.denglu.MainActivity">    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/et_userName"        android:text="账号"        android:layout_margin="15dp"        />    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/et_password"        android:text="密码"        android:layout_below="@+id/et_userName"        android:layout_margin="15dp"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:id="@+id/btn_login"        android:text="登录"        /></RelativeLayout>