Android RecyclerView最全使用详解_recyclerview使用详解

RecyclerView概述

RecyclerView是官方在5.0之后新添加的控件，推出用来替代传统的ListView和GridView列表控件。

RecyclerView使用-基础篇

第一步：添加RecyclerView

**方法1：**点开任意一个布局文件，找到左边的RecyclerView控件，点击旁边的按钮即可添加RecyclerView。

**方法2：**在build.gradle文件中添加依赖

    implementation 'androidx.recyclerview:recyclerview:1.1.0'
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第二步：添加布局文件

在布局文件activity_main.xml中先添加RecyclerView控件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>
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再添加一个item_list.xml的布局文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="29dp"
        android:layout_marginTop="33dp"
        android:text="标题"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:layout_marginTop="18dp"
        android:text="内容"
        app:layout_constraintStart_toStartOf="@+id/textView"
        app:layout_constraintTop_toBottomOf="@+id/textView" />
</androidx.constraintlayout.widget.ConstraintLayout>
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第三步：添加逻辑代码

首先定一个实体类如下：

public class News {
    public String title; // 标题
    public String content; //内容
}
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然后在MainActivity中定义内部类 ViewHolder类、 MyAdapter类以及设置RecyclerView相关逻辑

package com.lucashu.recyclerview;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity {
    RecyclerView mRecyclerView;
    MyAdapter mMyAdapter ;
    List<News> mNewsList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mRecyclerView = findViewById(R.id.recyclerview);
        // 构造一些数据
        for (int i = 0; i < 50; i++) {
            News news = new News();
            news.title = "标题" + i;
            news.content = "内容" + i;
            mNewsList.add(news);
        }
        mMyAdapter = new MyAdapter();
        mRecyclerView.setAdapter(mMyAdapter);
        LinearLayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);
        mRecyclerView.setLayoutManager(layoutManager);
    }

    class MyAdapter extends RecyclerView.Adapter<MyViewHoder> {

        @NonNull
        @Override
        public MyViewHoder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = View.inflate(MainActivity.this, R.layout.item_list, null);
            MyViewHoder myViewHoder = new MyViewHoder(view);
            return myViewHoder;
        }

        @Override
        public void onBindViewHolder(@NonNull MyViewHoder holder, int position) {
            News news = mNewsList.get(position);
            holder.mTitleTv.setText(news.title);
            holder.mTitleContent.setText(news.content);
        }

        @Override
        public int getItemCount() {
            return mNewsList.size();
        }
    }

    class MyViewHoder extends RecyclerView.ViewHolder {
        TextView mTitleTv;
        TextView mTitleContent;

        public MyViewHoder(@NonNull View itemView) {
            super(itemView);
            mTitleTv = itemView.findViewById(R.id.textView);
            mTitleContent = itemView.findViewById(R.id.textView2);
        }
    }
}

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运行效果

RecyclerView使用-进阶篇

布局管理器

RecyclerView提供了三种布局管理器即：

• LinearLayoutManager 线性布局管理器
• StaggeredGridLayoutManager 瀑布流布局管理器
• GridLayoutManager 网格布局管理器

线性布局管理器

这三种布局管理器都是通过setLayoutManager方法来设置
LinearLayoutManager 还可以设置横向滚动，只需将前面MainActivity中的layoutManager加一句代码即可：

 LinearLayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);
 layoutManager.setOrientation(RecyclerView.HORIZONTAL);
 mRecyclerView.setLayoutManager(layoutManager);
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网格布局管理器

如果让一行显示多个，可以设置 GridLayoutManager网格布局管理器来实现

  GridLayoutManager layoutManager = new GridLayoutManager(MainActivity.this,3);
//        layoutManager.setOrientation(RecyclerView.HORIZONTAL);  也能设置横向滚动
  mRecyclerView.setLayoutManager(layoutManager);
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ItemDecoration

通过给 设置ItemDecoration 来装饰Item的效果，比如我们要设置间隔线

DividerItemDecoration mDivider = new    
                        DividerItemDecoration(this,DividerItemDecoration.VERTICAL);
mRecyclerView.addItemDecoration(mDivider);
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Item 动画

RecyclerView提供了默认的ItemAnimator实现类：DefaultItemAnimator。该类可以帮我们实现一些炫酷的动画效果

DefaultItemAnimator itemAnimator = new DefaultItemAnimator();
defaultItemAnimator.setAddDuration(1000);
defaultItemAnimator.setRemoveDuration(1000);
 mRecyclerView.setItemAnimator(itemAnimator);
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在MainActivity中添加了两个按钮， 一个添加item，一个删除item

Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                News news = new News();
                news.title = "标题 新内容" ;
                news.content = "内容 新内容" ;
                mNewsList.add(1,news);
                mMyAdapter.notifyItemInserted(1);
            }
        });
        Button button1 = findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mNewsList.remove(0);
                mMyAdapter.notifyItemMoved(0,1);
            }
        });
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效果如下：

Item 点击

可以通过对整个Item文件的根布局添加一个点击事件来实现Item的点击

效果如下：

RecyclerView使用-高级篇（上拉刷新下拉加载更多）

通常RecyclerView使用的时候需要配合上拉刷新下拉加载更多的功能
我们通过开源控件SmartRefreshLayout来实现
SmartRefreshLayout官网：https://github.com/scwang90/SmartRefreshLayout
使用方法如下：

第一步：添加依赖

在gradle文件中添加

implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.1.2'   
implementation 'com.scwang.smartrefresh:SmartRefreshHeader:1.1.2'  
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第二步：布局文件

在activity_main.xml中SmartRefreshLayout控件将RecyclerView包裹起来

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <com.scwang.smartrefresh.layout.SmartRefreshLayout
        android:id="@+id/refreshLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recyclerview"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </com.scwang.smartrefresh.layout.SmartRefreshLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
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第三步：逻辑代码

在MainActivity的onCreate方法中添加下拉刷新和上拉加载更多的功能

下拉刷新：

RefreshLayout refreshLayout = findViewById(R.id.refreshLayout);
        refreshLayout.setOnRefreshListener(new OnRefreshListener() {
            @Override
            public void onRefresh(RefreshLayout refreshlayout) {
                refreshlayout.finishRefresh(2000/*,false*/);//传入false表示刷新失败
                mNewsList.clear();
                for (int i = 0; i < 10; i++) {
                    News news = new News();
                    news.title = "标题 新内容" + i;
                    news.content = "内容" + i;
                    mNewsList.add(news);
                }
                mMyAdapter.notifyDataSetChanged();
            }
        });
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上拉加载更多

 refreshLayout.setOnLoadMoreListener(new OnLoadMoreListener() {
            @Override
            public void onLoadMore(RefreshLayout refreshlayout) {
                refreshlayout.finishLoadMore(2000/*,false*/);//传入false表示加载失败
                for (int i = 0; i < 10; i++) {
                    News news = new News();
                    news.title = "标题 新内容" + i;
                    news.content = "内容" + i;
                    mNewsList.add(news);
                }
                mMyAdapter.notifyDataSetChanged();
            }
        });
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效果如下：

完整代码

MainActivity.java文件

package com.lucashu.recyclerview;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import com.scwang.smartrefresh.layout.api.RefreshLayout;
import com.scwang.smartrefresh.layout.listener.OnLoadMoreListener;
import com.scwang.smartrefresh.layout.listener.OnRefreshListener;

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

public class MainActivity extends AppCompatActivity {
    RecyclerView mRecyclerView;
    MyAdapter mMyAdapter ;
    List<News> mNewsList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mRecyclerView = findViewById(R.id.recyclerview);
        // 构造一些数据
        for (int i = 0; i < 10; i++) {
            News news = new News();
            news.title = "标题" + i;
            news.content = "内容" + i;
            mNewsList.add(news);
        }

        mMyAdapter = new MyAdapter();
        mRecyclerView.setAdapter(mMyAdapter);
        LinearLayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);
        mRecyclerView.setLayoutManager(layoutManager);


        RefreshLayout refreshLayout = findViewById(R.id.refreshLayout);
        refreshLayout.setOnRefreshListener(new OnRefreshListener() {
            @Override
            public void onRefresh(RefreshLayout refreshlayout) {
                refreshlayout.finishRefresh(2000/*,false*/);//传入false表示刷新失败
                mNewsList.clear();
                for (int i = 0; i < 10; i++) {
                    News news = new News();
                    news.title = "标题 新内容" + i;
                    news.content = "内容" + i;
                    mNewsList.add(news);
                }
                mMyAdapter.notifyDataSetChanged();
            }
        });

        refreshLayout.setOnLoadMoreListener(new OnLoadMoreListener() {
            @Override
            public void onLoadMore(RefreshLayout refreshlayout) {
                refreshlayout.finishLoadMore(2000/*,false*/);//传入false表示加载失败
                for (int i = 0; i < 10; i++) {
                    News news = new News();
                    news.title = "标题 新内容" + i;
                    news.content = "内容" + i;
                    mNewsList.add(news);
                }
                mMyAdapter.notifyDataSetChanged();
            }
        });

    }

    class MyAdapter extends RecyclerView.Adapter<MyViewHoder> {

        @NonNull
        @Override
        public MyViewHoder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = View.inflate(MainActivity.this, R.layout.item_list, null);
            MyViewHoder myViewHoder = new MyViewHoder(view);
            return myViewHoder;
        }

        @Override
        public void onBindViewHolder(@NonNull MyViewHoder holder, final int position) {
            News news = mNewsList.get(position);
            holder.mTitleTv.setText(news.title);
            holder.mTitleContent.setText(news.content);
            holder.mRootView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(MainActivity.this,"点击了："+ position,Toast.LENGTH_LONG).show();
                }
            });
        }

        @Override
        public int getItemCount() {
            return mNewsList.size();
        }
    }

    class MyViewHoder extends RecyclerView.ViewHolder {
        TextView mTitleTv;
        TextView mTitleContent;
        ConstraintLayout mRootView;

        public MyViewHoder(@NonNull View itemView) {
            super(itemView);
            mTitleTv = itemView.findViewById(R.id.textView);
            mTitleContent = itemView.findViewById(R.id.textView2);
            mRootView = itemView.findViewById(R.id.rootview);
        }
    }
}

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activity_main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <com.scwang.smartrefresh.layout.SmartRefreshLayout
        android:id="@+id/refreshLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recyclerview"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </com.scwang.smartrefresh.layout.SmartRefreshLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
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