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V：V层，我们的view层，也就是显示数据的地方，我们在得到数据之后，把数据传递给view层，通过他来显示数据。同时，view层的点击事件等处理会在这里出现，但真正的数据处理不是在这里，而是在model层中处理。

P：P层，也就是Presenter层，他是我们mvp架构中的中间人，通过p层的连接，让我们可以是M层和V层进行通信。M层在获取到数据之后，把它交给P，P层在交给View层，同样，View层的点击事件等处理通过P层去通知M层，让他去进行数据处理。

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安卓MVC架构 https://blog.csdn.net/qq_40881680/article/details/101571000

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视频讲解：点击下方按钮播放

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mvp架构模式讲解(仅限于新手理解)

视频源地址： https://www.bilibili.com/video/av69755230

代码如下

MainActivity:

package com.brk.mvp;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View {

private TextView news;

private Button add;

private Button less;

MainPresenter mainPresenter = new MainPresenter(this);

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initView();

mainPresenter.show();

}

@Override

public void addNum(String string) {

news.setText(string);

}

@Override

public void lessNum(String string) {

news.setText(string);

}

@Override

public void showNum(String string) {

news.setText(string);

}

private void initView() {

news = (TextView) findViewById(R.id.news);

add = (Button) findViewById(R.id.add);

less = (Button) findViewById(R.id.less);

add.setOnClickListener(new android.view.View.OnClickListener() {

@Override

public void onClick(android.view.View v) {

mainPresenter.addNum();

}

});

less.setOnClickListener(new android.view.View.OnClickListener() {

@Override

public void onClick(android.view.View v) {

mainPresenter.lessNum();

}

});

}

}

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MainPresenter:

package com.brk.mvp;

public class MainPresenter implements Presenter {

PeopleBean peopleBean = new PeopleBean(“NorthernBrain”, 0);

private View view;

public MainPresenter(View view) {

this.view = view;

}

@Override

public void addNum() {

peopleBean.setNum(peopleBean.getNum() + 1);

view.addNum(peopleBean.toString());

}

@Override

public void lessNum() {

peopleBean.setNum(peopleBean.getNum() - 1);

view.addNum(peopleBean.toString());

}

@Override

public void show() {

view.showNum(peopleBean.toString());

}

}

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PeopleBean:

package com.brk.mvp;

public class PeopleBean {

private String name;

private int num;

public PeopleBean(String name, int num) {

this.name = name;

this.num = num;

}

@Override

public String toString() {

return “PeopleBean{” +

“name='” + name + ‘’’ +

“, num=” + num +

‘}’;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getNum() {

return num;

}

public void setNum(int num) {

this.num = num;

}

}

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Presenter:

package com.brk.mvp;

public interface Presenter {

void addNum();

void lessNum();

void show();

}

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View:

package com.brk.mvp;

public interface View {

void addNum(String string);

void lessNum(String string);

void showNum(String string);

}