MVP入门及各种拓展

来源：互联网发布：java中可以加互斥锁编辑：程序博客网时间：2024/05/01 22:03

Mvp开发模式
废话不多说，我将分三篇或者四篇进行说明
第一篇 Mvp+Retrofit2
第二篇 Mvp+RxJava+Retrofit2
第三篇 Mvp+RxJava+Dagger2+Retrofit2
下面第一篇开始，在这里说明一点为了让大家看得清晰，我在这里就除了网络请求其它就不分包了，方便大家看目录结构
先看目录结构
这里写图片描述
在这里说明一下首字母是“I”的都是接口
继续
Mvp 模式的精髓就是面向接口编程，为什么这么说呢，其实，笔者认为代码可维护性，可拓展性的精髓就是面向接口编程。就比如，一个接口有N个实现类，突然来需求了，要你在这个接口里面加一个方法，那你直接在接口里面加就得了，然后他的实现类里面都实现一下。这样你就不会漏掉任何一个，提高了维护效率是肯定的，同时，你也少写了很多代码不是吗，所以说，Mvp就采用了这种思路。
介绍一下

M即Model ：顾名思义，就是模型，用于存放数据
V即View: 就是视图，里面写一下用于UI操作的一些方法
P即Presenter 主持人，里面持有 View和Model 主要任务是做一些业务逻辑，联系二者，将数据和UI进行关联。

ValueCallBack:回调接口，只有两种可能，成功或者失败，加一个泛型T，用于拓展它的受用面。

public interface ValueCallBack<T> {    void onSuccess(T t);    void onFailed(String errCode);}

IView 视图接口，用于UI操作

public interface IZhihuView {    void showToast(String toastStr);    void refreshView();    void setOnEmpty();}

Entity（GsonFormat自动生成）

public class Entity {    /**     * date : 20170626     * stories : [{"images":["https://pic1.zhimg.com/v2-b022395e73c72c5377b974c9452b2248.jpg"],"type":0,"id":9494287,"ga_prefix":"062618","title":"- 今天心情不好，不去运动了\r\n- 你哪天心情好过？"},{"images":["https://pic1.zhimg.com/v2-193096b3e4a32ceeca18e2c7f4dbca84.jpg"],"type":0,"id":9494901,"ga_prefix":"062617","title":"建筑中一个失败的细节，可能会变成「杀人凶器」"},{"images":["https://pic3.zhimg.com/v2-45ad4cd45c5a8ad2c165f6e48437e59a.jpg"],"type":0,"id":9491337,"ga_prefix":"062616","title":"将来我不会打自己的孩子，因为我知道还有更好的教育方式"},{"images":["https://pic1.zhimg.com/v2-9c7eb03dae75d83454571572b05b0c1c.jpg"],"type":0,"id":9494049,"ga_prefix":"062615","title":"与其说四大衰落了，不如说是审计行业开始回归常态"},{"images":["https://pic3.zhimg.com/v2-c2597b3c4f43297457a032976ec41b7a.jpg"],"type":0,"id":9491311,"ga_prefix":"062614","title":"只想安静地放空表情，怎么一不小心就向领导摆了张臭脸？"},{"images":["https://pic3.zhimg.com/v2-d984c2f6dd9a325ea4a559cf07516ff2.jpg"],"type":0,"id":9492269,"ga_prefix":"062613","title":"《帝国时代》20 年：你可还记得大明湖畔的伐木工？"},{"images":["https://pic3.zhimg.com/v2-b967db3abbe9399f0f363b0b1f7c52f6.jpg"],"type":0,"id":9486441,"ga_prefix":"062612","title":"大误 · 朕这皇帝我不当了"},{"images":["https://pic4.zhimg.com/v2-15f38eb7bb3137c75bd7dc8a3264cd0b.jpg"],"type":0,"id":9493628,"ga_prefix":"062611","title":"贴吧「关停并转」，高层人事动荡，陆奇和百度寻找下一个千亿美元计划"},{"images":["https://pic2.zhimg.com/v2-8aa443402ef9d4ca7c21d3784b1fdc41.jpg"],"type":0,"id":9493089,"ga_prefix":"062610","title":"作为一个辩论新手，如何自我提高？"},{"images":["https://pic2.zhimg.com/v2-4cc947cfa7d8e47dd44b5eeea757cc29.jpg"],"type":0,"id":9492517,"ga_prefix":"062609","title":"既然吃下去都是热量，我们为什么不把吃饭改成吃糖？"},{"images":["https://pic3.zhimg.com/v2-03d63fd3c401f0671fd601af4b891bbe.jpg"],"type":0,"id":9492978,"ga_prefix":"062608","title":"员工下班就准点走，真是没有「事业心」啊"},{"images":["https://pic4.zhimg.com/v2-d6818fb887fb602034d9d1512d48b21f.jpg"],"type":0,"id":9493083,"ga_prefix":"062607","title":"这些被遗忘的编程语言，还在诉说他们的故事"},{"images":["https://pic2.zhimg.com/v2-a632e6650b2f16e8224f5aee23df3471.jpg"],"type":0,"id":9492565,"ga_prefix":"062607","title":"一人一票选 CEO 的公司能赚到钱吗？"},{"images":["https://pic1.zhimg.com/v2-a23785b2003cdfe2192bdb5afa72fcc0.jpg"],"type":0,"id":9492696,"ga_prefix":"062607","title":"老人摔倒要不要扶？冷静，先听医生怎么说"},{"images":["https://pic3.zhimg.com/v2-9ba48b44a7ba09ce5984009e8b10b62e.jpg"],"type":0,"id":9492380,"ga_prefix":"062606","title":"瞎扯 · 如何正确地吐槽"}]     * top_stories : [{"image":"https://pic1.zhimg.com/v2-582f85f6b7deaaf9aaadb53fbf1fb3a8.jpg","type":0,"id":9493628,"ga_prefix":"062611","title":"贴吧「关停并转」，高层人事动荡，陆奇和百度寻找下一个千亿美元计划"},{"image":"https://pic1.zhimg.com/v2-18287777ea60f73f7e00de07ea3bb354.jpg","type":0,"id":9492696,"ga_prefix":"062607","title":"老人摔倒要不要扶？冷静，先听医生怎么说"},{"image":"https://pic2.zhimg.com/v2-dcaac62fda5695da379d289088bb50cd.jpg","type":0,"id":9491805,"ga_prefix":"062510","title":"传说中最美的荧光海，其实在国内也有"},{"image":"https://pic2.zhimg.com/v2-b86e151e46bc321f4abf34caef8b4445.jpg","type":0,"id":9491681,"ga_prefix":"062507","title":"他们回家了吗？他们相会了吗？只是我们永远都不知道了"},{"image":"https://pic2.zhimg.com/v2-dbb5f84d70b41b06359e6cb9cef38ab5.jpg","type":0,"id":9491009,"ga_prefix":"062509","title":"作为医生，我亲身参与过汶川、玉树和雅安地震灾后救援"}]     */    private String date;    private List<StoriesBean> stories;    private List<TopStoriesBean> top_stories;    public String getDate() {        return date;    }    public void setDate(String date) {        this.date = date;    }    public List<StoriesBean> getStories() {        return stories;    }    public void setStories(List<StoriesBean> stories) {        this.stories = stories;    }    public List<TopStoriesBean> getTop_stories() {        return top_stories;    }    public void setTop_stories(List<TopStoriesBean> top_stories) {        this.top_stories = top_stories;    }    public static class StoriesBean {        /**         * images : ["https://pic1.zhimg.com/v2-b022395e73c72c5377b974c9452b2248.jpg"]         * type : 0         * id : 9494287         * ga_prefix : 062618         * title : - 今天心情不好，不去运动了         - 你哪天心情好过？         */        private int type;        private int id;        private String ga_prefix;        private String title;        private List<String> images;        public int getType() {            return type;        }        public void setType(int type) {            this.type = type;        }        public int getId() {            return id;        }        public void setId(int id) {            this.id = id;        }        public String getGa_prefix() {            return ga_prefix;        }        public void setGa_prefix(String ga_prefix) {            this.ga_prefix = ga_prefix;        }        public String getTitle() {            return title;        }        public void setTitle(String title) {            this.title = title;        }        public List<String> getImages() {            return images;        }        public void setImages(List<String> images) {            this.images = images;        }    }    public static class TopStoriesBean {        /**         * image : https://pic1.zhimg.com/v2-582f85f6b7deaaf9aaadb53fbf1fb3a8.jpg         * type : 0         * id : 9493628         * ga_prefix : 062611         * title : 贴吧「关停并转」，高层人事动荡，陆奇和百度寻找下一个千亿美元计划         */        private String image;        private int type;        private int id;        private String ga_prefix;        private String title;        public String getImage() {            return image;        }        public void setImage(String image) {            this.image = image;        }        public int getType() {            return type;        }        public void setType(int type) {            this.type = type;        }        public int getId() {            return id;        }        public void setId(int id) {            this.id = id;        }        public String getGa_prefix() {            return ga_prefix;        }        public void setGa_prefix(String ga_prefix) {            this.ga_prefix = ga_prefix;        }        public String getTitle() {            return title;        }        public void setTitle(String title) {            this.title = title;        }    }}

IZhihuMode（不理解的话，照着敲10遍，下一篇我在讲）

public interface IZhihuMode {void getZhihuData(ValueCallBack<List<Entity.StoriesBean>> valueCallBack);    List<Entity.StoriesBean> returnDataToAdapter();}

ZhihuMode 具体的数据操作类

public class ZhihuMode implements IZhihuMode {    private List<Entity.StoriesBean> listData;    public ZhihuMode() {        listData=new ArrayList<>();    }    @Override    public void getZhihuData(final ValueCallBack<List<Entity.StoriesBean>> valueCallBack) {        Call<Entity> zhihuData = RetrofitManger.getInstance().getZhihuData();        zhihuData.enqueue(new Callback<Entity>() {            @Override            public void onResponse(Call<Entity> call, Response<Entity> response) {                List<Entity.StoriesBean> stories = response.body().getStories();                valueCallBack.onSuccess(stories);            }            @Override            public void onFailure(Call<Entity> call, Throwable t) {                valueCallBack.onFailed(t.getMessage());            }        });    }    @Override    public List<Entity.StoriesBean> returnDataToAdapter() {        return listData;    }}

BasePresenter这里为什么不用接口呢，因为接口里面的方法没有方法体，而抽象类就没有那么多限制，操作更灵活，拓展性更强。

public abstract class BasePresenter<T extends BaseActivity> {    abstract void initData();}

IZhihuPresenter

public interface IZhihuPresenter {    List<Entity.StoriesBean> getAdapterData();}

ZhihuPresenter 报错不要管

public class ZhihuPresenter extends BasePresenter<ZhihuActivity> implements IZhihuPresenter {    private IZhihuView view;    private IZhihuMode mode;    public ZhihuPresenter(IZhihuView view) {        this.view = view;        mode=new ZhihuMode();    }    @Override    void initData() {        mode.getZhihuData(new ValueCallBack<List<Entity.StoriesBean>>() {            @Override            public void onSuccess(List<Entity.StoriesBean> storiesBeen) {                mode.returnDataToAdapter().addAll(storiesBeen);                view.refreshView();            }            @Override            public void onFailed(String errCode) {                view.showToast(errCode);                view.setOnEmpty();            }        });    }    @Override    public List<Entity.StoriesBean> getAdapterData() {        return mode.returnDataToAdapter();    }}

BaseActivity 这里有点高能，泛型是T 继承 BasePresenter 然后具体的Activity继承BaseActivity ，在前面又可知，具体的Presenter继承BasePresenter,所以，具体的Activity就可以通过继承baseActicity里面的泛型，来引用具体的Presenter，我说得不太好，语言表达能力有限，不懂的话，就一个字，敲！！！

public abstract class BaseActivity<T extends BasePresenter> extends AppCompatActivity {    public T basePresenter;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(getLayout());        initView();        basePresenter=initPresenter();        onPrepare();    }    protected abstract void onPrepare();    protected abstract T initPresenter();    protected abstract void initView();    protected abstract int getLayout();}

ZhihuActivity

public class ZhihuActivity extends BaseActivity<ZhihuPresenter> implements IZhihuView {    private ListView listView;    private MyListAdapter adapter;    @Override    protected void onPrepare() {        basePresenter.initData();        adapter=new MyListAdapter(this,basePresenter.getAdapterData());        listView.setAdapter(adapter);    }    @Override    protected ZhihuPresenter initPresenter() {        return new ZhihuPresenter(this);    }    @Override    protected void initView() {        listView= (ListView) findViewById(R.id.list001);    }    @Override    protected int getLayout() {        return R.layout.activity_zhihu;    }    @Override    public void showToast(String toastStr) {        Toast.makeText(this, toastStr, Toast.LENGTH_SHORT).show();    }    @Override    public void refreshView() {        adapter.notifyDataSetChanged();    }    @Override    public void setOnEmpty() {    }}

至此，别忘了加上网络请求，XML 自己写吧，就俩也不难，
是不是感觉梦梦的，没关系，蒙着蒙着就会了。

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