RecycleView

MainActivity中：

package com.bwei.demo.day13_recycview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private List<String> list;
    private MyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RecyclerView rcv = findViewById(R.id.rcv);

        //设置布局管理器

        /**
         * 第一个参数是一个上下文
         * 第二个参数是方向
         * 第三个参数是否返转
         *
         *
         * 第一种是   线性布局
         * 第二种是   表格布局、
         * 第三种是    瀑布流的
         */
        rcv.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));

        //设置item添加和删除的动画
        rcv.setItemAnimator(new DefaultItemAnimator());
        //增加分隔线
        rcv.addItemDecoration(new MyDividerItemDecoration(this,LinearLayoutManager.VERTICAL));


        //第一个参数的话是上下文
        //第二个参数是一行有几个
       // rcv.setLayoutManager(new GridLayoutManager(this,4));

       // rcv.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));

        ititData();

        adapter = new MyAdapter(list);
        rcv.setAdapter(adapter);


        //MainActivity 回调adapter方法
        adapter.setOnItemClickListener(new MyAdapter.OnItemClickListener() {

            @Override
            public void itemClick(View v, int position) {
                Toast.makeText(MainActivity.this, "item点击事件", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void itemLongClick(View v, int position) {
                Toast.makeText(MainActivity.this, "item点击长按事件", Toast.LENGTH_SHORT).show();
            }
        });

    }

    private void ititData() {
        list = new ArrayList<>();
        for (int x=0;x<10;x++){
            list.add("item"+x);
        }
    }

    /**
     * 添加item的点击事件
     * @param view
     */
    public void addItem(View view) {
        adapter.add();
    }

    /**
     * 添加item的点击事件
     * @param view
     */
    public void remvoeItem(View view) {
        adapter.remove();
    }
}

适配器中的：

package com.bwei.demo.day13_recycview;

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import java.util.List;

/**
 * Created by Administrator on 2018/3/15.
 */

public class MyAdapter extends RecyclerView.Adapter {
    List<String> list;
    OnItemClickListener listener;

    public MyAdapter(List<String> list) {
        this.list = list;
    }

    /**
     * 创建ViewHolder
     * @param parent
     * @param viewType
     * @return
     */
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View view = View.inflate(parent.getContext(), R.layout.rc_item, null);


        //创建ViewHolder  把view通过构造方法传过去
        MyViewHolder myViewHolder = new MyViewHolder(view);


        return myViewHolder;
    }


    /**
     * 绑定view   简单的可以认为是给item设置数据用的
     * @param holder
     * @param position
     */
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

        final MyViewHolder myViewHolder = (MyViewHolder) holder;

        myViewHolder.mtv.setText(list.get(position));
        myViewHolder.bt.setText("aaaa");

        //给recycleView的item设置点击事件
        myViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                //索引
                int layoutPosition = myViewHolder.getLayoutPosition();

                //进行回调
                listener.itemClick(myViewHolder.itemView,layoutPosition);
            }
        });

        //长按事件
        myViewHolder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {

                //索引
                int layoutPosition = myViewHolder.getLayoutPosition();

                //进行回调
                listener.itemLongClick(myViewHolder.itemView,layoutPosition);

                return true;
            }
        });



    }

    /**
     * recyclerView  的item的个数
     * @return
     */
    @Override
    public int getItemCount() {
        return list.size();
    }


    /**
     * recyclerView的监听事件
     */
    public void setOnItemClickListener(OnItemClickListener listener){


        this.listener = listener;
    }


    class MyViewHolder extends RecyclerView.ViewHolder{

        TextView mtv;
        Button bt;

        public MyViewHolder(View view) {
            super(view);

            mtv =view.findViewById(R.id.rv_tv);
            bt = view.findViewById(R.id.rv_bt);
        }


    }


    public void add(){
       list.add(0,"我是新加的数据");


      // notifyDataSetChanged();
       notifyItemInserted(0);

    }


    //删除item的方法
    public void remove(){

        if (list==null){
            return;
        }else {
            //进行移除
            list.remove(0);
            notifyItemRemoved(0);
        }

    }


    interface OnItemClickListener{
        void  itemClick(View v,int position);
        void  itemLongClick(View v,int position);
    }
}

用于绘制：

package com.bwei.demo.day13_recycview;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

/**
 * Created by Administrator on 2018/3/15.
 */

public class MyDividerItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };
    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
    /**
     * 用于绘制间隔样式
     */
    private Drawable mDivider;
    /**
     * 列表的方向，水平/竖直
     */
    private int mOrientation;


    public MyDividerItemDecoration(Context context, int orientation) {
        // 获取默认主题的属性
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
        setOrientation(orientation);
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        // 绘制间隔
        if (mOrientation == VERTICAL_LIST) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        if (mOrientation == VERTICAL_LIST) {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        } else {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }

    private void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    /**
     * 绘制间隔
     */
    private void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin +
                    Math.round(ViewCompat.getTranslationY(child));
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    /**
     * 绘制间隔
     */
    private void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getRight() + params.rightMargin +
                    Math.round(ViewCompat.getTranslationX(child));
            final int right = left + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }
}

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.bwei.demo.day13_recycview.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rcv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
         />



    <Button
        android:onClick="addItem"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="添加"/>
    <Button
        android:onClick="remvoeItem"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="移除"/>

</LinearLayout>

Recycleview的item：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <TextView
        android:id="@+id/rv_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:focusable="false"
        android:id="@+id/rv_bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

</LinearLayout>