用 MVP 模式构建 Android 代码

public class UserBiz implements IUserBiz{

@Override

public void login(final String username,final String password,final OnLoginListener loginListener){

//模拟子线程耗时操作

new Thread()

{

@Override

public void run()

{

try

{

Thread.sleep(2000);

} catch (InterruptedException e)

{

e.printStackTrace();

}

//模拟登录成功

if ("wxh".equals(username) && "123".equals(password))

{

User user = new User();

user.setUsername(username);

user.setPassword(password);

loginListener.loginSuccess(user);

} else

{

loginListener.loginFailed();

}

}

}.start();

}

}

（二）Presenter

package com.example.administrator.mvp.presenter;

import android.os.Handler;

import com.example.administrator.mvp.bean.User;

import com.example.administrator.mvp.biz.IUserBiz;

import com.example.administrator.mvp.biz.OnLoginListener;

import com.example.administrator.mvp.biz.UserBiz;

import com.example.administrator.mvp.view.IUserLoginView;

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.getUserName(), userLoginView.getPassword(), new OnLoginListener()

{

@Override

public void loginSuccess(final User user)

{

//需要在 UI 线程执行

mHandler.post(new Runnable()

{

@Override

public void run()

{

userLoginView.toMainActivity(user);

userLoginView.hideLoading();

}

});

}

@Override

public void loginFailed()

{

//需要在 UI 线程执行

mHandler.post(new Runnable()

{

@Override

public void run()

{

userLoginView.showFailedError();

userLoginView.hideLoading();

}

});

}

});

}

public void clear()

{

userLoginView.clearUserName();

userLoginView.clearPassword();

}

}

（三）View

package com.example.administrator.mvp.view;

import com.example.administrator.mvp.bean.User;

public interface IUserLoginView {

public String getUserName();

public String getPassword();

public void clearUserName();

public void clearPassword();

public void showLoading();

public void hideLoading();

public void toMainActivity(User user);

public void showFailedError();

}

package com.example.administrator.mvp.view;

import android.os.Bundle;

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 com.example.administrator.mvp.R;

import com.example.administrator.mvp.bean.User;

import com.example.administrator.mvp.presenter.UserLoginPresenter;

public class UserLoginActivity extends AppCompatActivity implements IUserLoginView{

private EditText mEtUsername,mEtPassword;

private Button mBtnLogin,mBtnClear;

private ProgressBar mPbLoading;

private UserLoginPresenter mUserLoginPresenter = new UserLoginPresenter(this);

@Override

protected void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_user_login);

initViews();

}

private void initViews()

{

mEtUsername = (EditText) findViewById(R.id.username);

mEtPassword = (EditText) findViewById(R.id.password);

mBtnClear = (Button) findViewById(R.id.clear);

mBtnLogin = (Button) findViewById(R.id.login);

mPbLoading = (ProgressBar) findViewById(R.id.loading);

mBtnLogin.setOnClickListener(new View.OnClickListener()

{

@Override

public void onClick(View v)

{

mUserLoginPresenter.login();

}

});

mBtnClear.setOnClickListener(new View.OnClickListener()

{

@Override

public void onClick(View v)

{

mUserLoginPresenter.clear();

}

});

}

@Override

public String getUserName()

{

return mEtUsername.getText().toString();

}

@Override

public String getPassword()

{

return mEtPassword.getText().toString();

}

@Override

public void clearUserName()

{

mEtUsername.setText("

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");

}

@Override

public void clearPassword()

{

mEtPassword.setText("");

}

@Override

public void showLoading()

{

mPbLoading.setVisibility(View.VISIBLE);

}

@Override

public void hideLoading()

{

mPbLoading.setVisibility(View.GONE);

}

@Override

public void toMainActivity(User user)

{

Toast.makeText(this, user.getUsername() +

" login success , to MainActivity", Toast.LENGTH_SHORT).show();

}

@Override

public void showFailedError()

{

Toast.makeText(this,

"login failed", Toast.LENGTH_SHORT).show();

}

}