MVCMVPMVVM模式对比总结用户登录例子

Posted 2020-09-20

前言说明

在实战项目及学习中来总结一下android端项目构架

包括MVC、MVP、MVVM，主要针对移动Android端

该篇以Android平台用户登录为例子，用代码来描述构架模式

代码主要作理解，所以可能不完整，因为去掉一些精简方便说明

 

目录

1.构架基础

2.横向构架模型

3.纵向构架流程

4.用户登录例子

 

 

4. 用户登录例子

公共代码

NetHelper网络通信类

使用Retrofit+RxJava技术

NetHelper 
{
    private static String baseUrl = "http://xxx/";
    private static Retrofit retrofit = null;
    private static OkHttpClient okHttpClient = null;
    private static NetService netService;
    
    static {
        OkHttpClient.Builder okBuilder = OkHttpClient.Builder();
        okBuilder.addInterceptor(new HttpLoggingInterceptor()
            .setLevel(HttpLoggingInterceptor.Level.BODY));
        okHttpClient = okBuilder.build();
        
        Retrofit.Builder builder = new Retrofit.Builder();
        retrofit = builder.baseUrl(baseUrl)
                .client(sOkHttpClient)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .build();
        netService = sRetrofit.create(NetService.class);
    }
    
    public static NetService getNetService() {
        reutrn netService;
    }
    
    public interface NetService {
        @POST("login")
        Observable<String> login(@Query("username") username, @Query("userpass") userpass);
    }
}

用户业务UserBiz( model层)

UserBiz
{
    Observable<String> login(String username, String userpass) {
        return NetHelper.getNetService.login(username, userpass);
    }
}

 

 

MVC例子代码

布局文件

<Layout>
        <TextView id="username"/>
        <TextView id="userpass"/>
    　　<Button id="button" />
</Layout>

登录界面LoginActivity( view层)

LoginActivity extends Activity
{
    String username;
    String userpass; 

    void onCreate(Bundle bdle) {
        setContentView(login_layout);
        
        username = findById(username);
        userpass = findById(userpass);
        
        findById(button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                login();
            }
        });
    }
    
    void login() {
        new UserManager()
            .login(username, userpass)
            .subscribe(new Action1<String>() {
                @Override
                public void call(String loginResultString) {
                    if(loginResultString) {
                        Toast.makeText(getApplicationContext(), 
                            username() + "--登录成功", Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(getApplicationContext(), 
                            username() + "--登录失败", Toast.LENGTH_SHORT).show();
                    }
                }
            };
    }
}

用户管理UserManager( controller层)

UserManager
{
    Observable<String> login(String username, String userpass) {
        return new UserBiz().login(username, userpass)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread());
    }
}

用户业务UserBiz( model层)

查看公共代码

 

MVP例子代码

布局文件

<Layout>
        <TextView id="username"/>
        <TextView id="userpass"/>
    　　<Button id="button" />
</Layout>

登录界面LoginActivity( view层)

LoginActivity extends Activity impl IUserView
{
    String username;
    String userpass; 

    void onCreate(Bundle bdle) {
        setContentView(login_layout);
        
        username = findById(username);
        userpass = findById(userpass);
        
        findById(button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new UserPresenter(this).login()
            }
        });    
    }
    
    @Override
    String getUserName() {
        return username;
    }
    @Override
    String getPassword() {
        return userpass;
    }
    
    @Override
    void showSuccess() {
        Toast.makeText(getApplicationContext(), 
                username() + "--登录成功", Toast.LENGTH_SHORT).show();
    }
    
    @Override
    void showFailure() {
        Toast.makeText(getApplicationContext(), 
                username() + "--登录失败", Toast.LENGTH_SHORT).show();
    }

}

用户视图接口IUserView( view层)

interface IUserView
{

    String getUserName();

    String getUserPass();
    
    void showSuccess();
    
    void showFailure();
}

用户调配UserPresenter( presenter层)

UserPresenter
{
    IUserView userView;
    
    UserPresenter(IUserView userView) {
        this.userView = userView;
    }

    void login() {
        new UserBiz().login(userView.getUserName(), userView.getUserPass())
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Action1<String>() {
                @Override
                public void call(String loginResultString) {
                    if(loginResultString) {
                        userView.showSuccess();
                    } else {
                        userView.showFailure();
                    }
                }
            };
    }
}

用户业务UserBiz( model层)

查看公共代码

 

MVVM例子代码

布局文件

<layout>
    <data>
        <name="userViewModel"
         type="com.test.viewModel.UserViewModel" />
    </data> 
    <layout>
        <TextView id="username"/>
        <TextView id="userpass"/>
        <Button id="button"
           onclick="@{userViewModel.login}" />
    </layout>
</layout>

登录界面LoginActivity( view层)

LoginActivity extends Activity
{
    void onCreate(Bundle bdle) {
      MainBinding binding = DataBindingUtil.setContentView(this, login_layout);
      binding.setViewModel(new UserViewModel(binding, this));
    }
}

用户视图模型UserViewModel( viewModel层)

UserViewModel
{
    String username;
    String userpass;
    
    Context context;
    
    UserViewModel(MainBinding mainBinding, Context context) {
      this.context = context;
      username = mainBinding.username.getText().toString.trim();
      userpass = mainBinding.userpass.getText().toString.trim();
    }
    
    void login() {
        new UserBiz().login(username, userpass)
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Action1<String>() {
                @Override
                public void call(String loginResultString) {
                    if(loginResultString) {
                        Toast.makeText(context, 
                            username + "--登录成功", Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(context, 
                            username + "--登录失败", Toast.LENGTH_SHORT).show();
                    }
                }
            };
    }
}

用户业务UserBiz( model层)

查看公共代码