Android MVP模式下的登录实现

package com.example.mvpdemo.view;

/**
*    基本的页面操作
*
*/
public interface IBaseView {
//Toast形式提示
public void showMsg(String msg);
//加载提示框
public void    showLoading();
//隐藏加载提示框
public void hiddenLoading();
//页面跳转
public void jumpActivity();
//返回
public boolean back();
}

package com.example.mvpdemo.view;

/**
*    登陆界面的View，继承基本的IBaseView，IBaseView对于Login界面操作已经足够，所以没有实质内容
*
*/
public interface ILoginView extends IBaseView {

}

package com.example.mvpdemo.model;
/**
* 最基本的模型
*
*/
public interface IBaseModel {
public static final int STATUS_FAIL = -1;// 验证失败
public static final int STATUS_SUCCESS = 0;// 成功
public static final int STATUS_NORMAL = 1;// 正常状态
public static final int STATUS_VERIFY_ING = 2;// 正常状态
}

package com.example.mvpdemo.model;
/**
* 登陆的数据模型
*
*/
public interface ILoginModel extends IBaseModel{
/**
*
* @param username 用户名
* @param pwd    密码
* @param loginCallBack    登陆回调接口
*/
public void login(String username,String pwd,ILoginCallBack loginCallBack);
/**
*    登陆回调接口及回调方法
*/
interface ILoginCallBack {
public void onStatus();
}
}

package com.example.mvpdemo.model.impl;

import com.example.mvpdemo.model.ILoginModel;

import android.os.AsyncTask;
/**
* 登陆模型的具体实现
*
*/
public class LoginModelImpl implements ILoginModel {
public int status = ILoginModel.STATUS_NORMAL;    //记录登陆状态
public String msg;    //登陆操作后的提示语

@Override
public void login(final String username, final String pwd,
final ILoginCallBack loginCallBack) {
if (status == ILoginModel.STATUS_VERIFY_ING) {
return;
}
new AsyncTask<Void, Void, ILoginCallBack>() {

@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
}

@Override
protected ILoginCallBack doInBackground(Void... params) {
// TODO Auto-generated method stub
//具体的业务实现
if (username.equals("123") && pwd.equals("123")) {
status = ILoginModel.STATUS_SUCCESS;
msg = "登陸成功";
} else {
msg = "用户名或密码错误";
status = ILoginModel.STATUS_FAIL;
}
return loginCallBack;
}

@Override
protected void onPostExecute(ILoginCallBack result) {
// TODO Auto-generated method stub
loginCallBack.onStatus();    //登陆成功后进行接口回调，告诉presenter对view操作进行界面操作
super.onPostExecute(result);
}

}.execute();
}
}

package com.example.mvpdemo.presenter;

import com.example.mvpdemo.model.ILoginModel;
import com.example.mvpdemo.model.ILoginModel.ILoginCallBack;
import com.example.mvpdemo.model.impl.LoginModelImpl;
import com.example.mvpdemo.view.ILoginView;
/**
*    登陆的Presenter
*/
public class LoginPresenter {
LoginModelImpl loginModel;
ILoginView iLoginView;

public LoginPresenter(ILoginView iLoginView) {
super();
loginModel = new LoginModelImpl();
this.iLoginView = iLoginView;
}

public ILoginView getiLoginView() {
return iLoginView;
}

public void setiLoginView(ILoginView iLoginView) {
this.iLoginView = iLoginView;
}

/**
* 调用model进行数据处理，根据回调接口来操作ILoginView进行对应的activity界面更新
* @param username
* @param pwd
*/
public void login(String username, String pwd) {
System.out.println(username+","+pwd);
loginModel.login(username, pwd, new ILoginCallBack() {

public void onStatus() {
System.out.println(loginModel.status+"");
switch (loginModel.status) {
case LoginModelImpl.STATUS_SUCCESS:
iLoginView.jumpActivity();
iLoginView.showMsg(loginModel.msg);
break;
case LoginModelImpl.STATUS_FAIL:
iLoginView.showMsg(loginModel.msg);
break;
default:
break;
}
loginModel.status=ILoginModel.STATUS_NORMAL;
}
});
}
}

package com.example.mvpdemo;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.example.mvpdemo.presenter.LoginPresenter;
import com.example.mvpdemo.view.ILoginView;

public class LoginActivity extends Activity implements ILoginView {
String Tag = "MainActivity";
LoginPresenter loginPresenter;
EditText username_et;
EditText pwd_et;
Button submit_btn;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loginPresenter = new LoginPresenter(this);
initView();
}

void initView() {
username_et = (EditText) findViewById(R.id.username_et);
pwd_et = (EditText) findViewById(R.id.pwd_et);
submit_btn = (Button) findViewById(R.id.submit_btn);
submit_btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String username = username_et.getText().toString();
String pwd = pwd_et.getText().toString();
loginPresenter.login(username, pwd);
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public void showMsg(String msg) {
// TODO Auto-generated method stub
Log.i(Tag, msg);
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}

@Override
public void showLoading() {
// TODO Auto-generated method stub
Log.i(Tag, "showLoading");
}

@Override
public void hiddenLoading() {
// TODO Auto-generated method stub
Log.i(Tag, "hiddenLoading");
}

@Override
public void jumpActivity() {
// TODO Auto-generated method stub
startActivity(new Intent(LoginActivity.this, MainActivity.class));
}

long lastTime;
@Override
public boolean back() {
long currTime=System.currentTimeMillis();
if(currTime-lastTime>3000){
showMsg("再按一次退出");
lastTime=currTime;
}else{
finish();
}
return false;
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if(keyCode==KeyEvent.KEYCODE_BACK){
return back();
}
return super.onKeyDown(keyCode, event);
}
}