Android MVP(转)

幼敏悟过人,读书辄成诵。这篇文章主要讲述Android MVP(转)相关的知识,希望能为你提供帮助。
[转载请标明出处: 
http://blog.csdn.net/lmj623565791/article/details/46596109]
效果图:

Android MVP(转)

文章图片

看到这样的效果,先看下完工后的项目结构:
Android MVP(转)

文章图片

【Android MVP(转)】ok,接下来开始一步一步的编写思路。
(一)Model(bean)首先实体类User不用考虑这个肯定有,其次从效果图可以看到至少有一个业务方法login(),这两点没什么难度,我们首先完成:
package com.zhy.blogcodes.mvp.bean; /** * Created by zhy on 15/6/18. */ 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; } }

model接口:
package com.zhy.blogcodes.mvp.biz; /** * Created by zhy on 15/6/19. */ public interface IUserBiz { public void login(String username, String password, OnLoginListener loginListener); }

model实现:
package com.zhy.blogcodes.mvp.biz; import com.zhy.blogcodes.mvp.bean.User; /** * Created by zhy on 15/6/19. */ 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 ("zhy".equals(username) & & "123".equals(password)) { User user = new User(); user.setUsername(username); user.setPassword(password); loginListener.loginSuccess(user); } else { loginListener.loginFailed(); } } }.start(); } }

登录状态接口:
package com.zhy.blogcodes.mvp.biz; import com.zhy.blogcodes.mvp.bean.User; /** * Created by zhy on 15/6/19. */ public interface OnLoginListener { void loginSuccess(User user); void loginFailed(); }

实体类不用说,至于业务类,我们抽取了一个接口,一个实现类这也很常见~~login方法,一般肯定是连接服务器的,是个耗时操作,所以我们开辟了子线程,Thread.sleep(2000)模拟了耗时,由于是耗时操作,所以我们通过一个回调接口来通知登录的状态。
其实这里还是比较好写的,因为和传统写法没区别。
(二) Viewview接口:
package com.zhy.blogcodes.mvp.view; import com.zhy.blogcodes.mvp.bean.User; /** * Created by zhy on 15/6/19. */ public interface IUserLoginView { String getUserName(); String getPassword(); void clearUserName(); void clearPassword(); void showLoading(); void hideLoading(); void toMainActivity(User user); void showFailedError(); }

(view实现)下面贴一下我们的View的实现类,哈,其实就是Activity,文章开始就说过,MVP中的View其实就是Activity。 
package com.zhy.blogcodes.mvp; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ProgressBar; import android.widget.Toast; import com.zhy.blogcodes.R; import com.zhy.blogcodes.mvp.bean.User; import com.zhy.blogcodes.mvp.presenter.UserLoginPresenter; import com.zhy.blogcodes.mvp.view.IUserLoginView; public class UserLoginActivity extends ActionBarActivity 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.id_et_username); mEtPassword = (EditText) findViewById(R.id.id_et_password); mBtnClear = (Button) findViewById(R.id.id_btn_clear); mBtnLogin = (Button) findViewById(R.id.id_btn_login); mPbLoading = (ProgressBar) findViewById(R.id.id_pb_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(""); }@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(); } }

对于在Activity中实现我们上述定义的接口,是一件很容易的事,毕竟接口引导我们去完成。
(三)PresenterPresenter是用作Model和View之间交互的桥梁,那么应该有什么方法呢?
其实也是主要看该功能有什么操作,比如本例,两个操作:login和clear。
package com.zhy.blogcodes.mvp.presenter; import android.os.Handler; import com.zhy.blogcodes.mvp.bean.User; import com.zhy.blogcodes.mvp.biz.IUserBiz; import com.zhy.blogcodes.mvp.biz.OnLoginListener; import com.zhy.blogcodes.mvp.biz.UserBiz; import com.zhy.blogcodes.mvp.view.IUserLoginView; /** * Created by zhy on 15/6/19. */ 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(); }}

注意上述代码,我们的presenter完成二者的交互,那么肯定需要二者的实现类。大致就是从View中获取需要的参数,交给Model去执行业务方法,执行的过程中需要的反馈,以及结果,再让View进行做对应的显示。


    推荐阅读