一、理解MVP
效果图：
项目结构：
实现
一、Model层
首先定义一个实体类User
package app.qcu.pmit.cn.mvpdemo.model;
/**
* Created by Administrator on 2018/5/24 0024.
*/
public class User {
private String username;
private String 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;
}
}
其次就是业务类，抽取了一个接口 IUserBiz,登录界面连接服务器有一个登录方法 Login() ,耗时操作需要开辟子线程，
package app.qcu.pmit.cn.mvpdemo.model;
/**
* Created by Administrator on 2018/5/24 0024.
*/
public class UserBiz implements IUserBiz {
@Override
public void login(final String name, final String pwd, final OnLoginListener listener) {
new Thread() {
@Override
public void run() {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
if ("yl".equals(name) && "123456".equals(pwd)) {
User user = new User();
user.setUsername(name);
user.setPassword(pwd);
listener.loginSuccess(user);
} else {
listener.loginFaild();
}
}
}.start();
}
}
package app.qcu.pmit.cn.mvpdemo.model;
/**
* Created by Administrator on 2018/5/24 0024.
*/
public interface IUserBiz {
void login(String name, String pwd, OnLoginListener listener);
}
再用一个回调接口来通知登录的状态，成功或者失败
package app.qcu.pmit.cn.mvpdemo.model;
/**
* Created by Administrator on 2018/5/24 0024.
*/
public interface OnLoginListener {
void loginSuccess(User user);
void loginFaild();
}
二、View层
UI的逻辑，抽取一个接口由Activity实现
package demo.example.com.mvp3.view;
/**
* Created by Administrator on 2018/5/9 0009.
*/
public interface IUserLoginView {
String getName();
String getPwd();
void showLoading();
void hideLoading();
void toMainActivity();
void showFaildError();
void clearName();
void clearPwd();
}
package demo.example.com.mvp3.view;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
import demo.example.com.mvp3.MainActivity;
import demo.example.com.mvp3.R;
import demo.example.com.mvp3.presenter.UserLoginPresenter;
/**
* Created by Administrator on 2018/5/9 0009.
*/
public class UserLoginActivity extends AppCompatActivity implements IUserLoginView {
private EditText etName, etPwd;
private Button btnLogin, btnClear;
private ProgressBar pbLogin;
private UserLoginPresenter userLoginPresenter = new UserLoginPresenter(this);
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
initView();
}
private void initView() {
etName = findViewById(R.id.user_name);
etPwd = findViewById(R.id.user_pwd);
btnLogin = findViewById(R.id.btn_login);
btnClear = findViewById(R.id.btn_clear);
pbLogin = findViewById(R.id.pb_login);
btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
userLoginPresenter.Login();
}
});
btnClear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
userLoginPresenter.clear();
}
});
}
@Override
public String getName() {
return etName.getText().toString();
}
@Override
public String getPwd() {
return etPwd.getText().toString();
}
@Override
public void showLoading() {
pbLogin.setVisibility(View.VISIBLE);
}
@Override
public void hideLoading() {
pbLogin.setVisibility(View.GONE);
}
@Override
public void toMainActivity() {
startActivity(new Intent(this, MainActivity.class));
}
@Override
public void showFaildError() {
Toast.makeText(this, "名字还是密码写错啦！", Toast.LENGTH_SHORT).show();
}
@Override
public void clearName() {
etName.setText("");
}
@Override
public void clearPwd() {
etPwd.setText("");
}
}
三、Presenter层
界面整体的用户交互的功能有两个，“登录”和“清除”，所以Presenter中有两个方法，即 login() 和 clear()，使用view和model中的方法实现
package app.qcu.pmit.cn.mvpdemo.presenter;
import android.os.Handler;
import app.qcu.pmit.cn.mvpdemo.model.IUserBiz;
import app.qcu.pmit.cn.mvpdemo.model.OnLoginListener;
import app.qcu.pmit.cn.mvpdemo.model.User;
import app.qcu.pmit.cn.mvpdemo.model.UserBiz;
import app.qcu.pmit.cn.mvpdemo.view.IUserLoginView;
/**
* Created by Administrator on 2018/5/24 0024.
*/
public class UserLoginPresenter {
private IUserBiz userBiz;
private IUserLoginView userLoginView;
private Handler mHandler = new Handler();
public UserLoginPresenter(IUserLoginView userLoginView) {
this.userLoginView = userLoginView;
this.userBiz = new UserBiz();
}
public void Login() {
userLoginView.showLoading();
userBiz.login(userLoginView.getName(), userLoginView.getPwd(), new OnLoginListener() {
@Override
public void loginSuccess(User user) {
//需要在UI线程执行
mHandler.post(new Runnable() {
@Override
public void run() {
userLoginView.toMainActivity();
userLoginView.hideLoading();
}
});
}
@Override
public void loginFaild() {
//需要在UI线程执行
mHandler.post(new Runnable() {
@Override
public void run() {
userLoginView.showFaildError();
userLoginView.hideLoading();
}
});
}
});
}
public void clear() {
userLoginView.clearName();
userLoginView.clearPwd();
}
}