Android RecylerView

最新推荐文章于 2025-06-26 15:10:49 发布

原创最新推荐文章于 2025-06-26 15:10:49 发布 · 195 阅读

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本文详细介绍了如何在Android应用中使用RecyclerView实现多种布局效果，包括垂直列表、网格布局和瀑布流布局，并展示了如何通过按钮点击事件动态切换布局类型。同时，文章还提供了自定义适配器和条目点击事件的实现方式。

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package com.example.dell.recylerveiw;

import android.support.annotation.NonNull;
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.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private RecyclerView recycler;
    private ArrayList<String> list;
    private Button click;
    private Button click2;
    private Button click3;
    private GridLayoutManager gridLayoutManager;
    private LinearLayoutManager linearLayoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_main );
        recycler = (RecyclerView) findViewById( R.id.recycler );
        click = findViewById( R.id.click );
        click2 = findViewById( R.id.click2 );
        click3 = findViewById( R.id.click3 );
        //模拟数据
        list = new ArrayList<>();
        for (int i = 0; i < 200; i++) {
            list.add( "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" );
            list.add( "BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB" );
            list.add( "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC" );
            list.add( "DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD" );
        }
        //通过点击事件实现各种列表展示
        click.setOnClickListener( new View.OnClickListener() {


            @Override
            public void onClick(View v) {
                linearLayoutManager = new LinearLayoutManager( MainActivity.this );
                linearLayoutManager.setOrientation( LinearLayoutManager.VERTICAL );
                //设置布局管理器
                recycler.setLayoutManager( linearLayoutManager );
            }
        } );
        click.setOnClickListener( new View.OnClickListener() {


            @Override
            public void onClick(View v) {
                gridLayoutManager = new GridLayoutManager( MainActivity.this, 2 );
                recycler.setLayoutManager( gridLayoutManager );
            }
        } );
        click3.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //瀑布流  spanCount为列数
                StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager( 2, StaggeredGridLayoutManager.VERTICAL );
                recycler.setLayoutManager( staggeredGridLayoutManager );
            }
        } );
        //设置动画
        recycler.setItemAnimator( new DefaultItemAnimator() );
        //设置适配器
        final MyAdapter myAdapter = new MyAdapter( MainActivity.this, list );
        recycler.setAdapter( myAdapter );
        //通过接口回调的方法  实现条目点击事件
        myAdapter.setOnClickItem( new MyAdapter.setOnClickItem() {
            @Override
            public void setOnItemClickListener(int position) {
                Toast.makeText( MainActivity.this, position + "", Toast.LENGTH_SHORT ).show();
                /*list.remove( position );
                myAdapter.notifyDataSetChanged();*/
                myAdapter.notifyItemRemoved( position );
            }
        } );
    }
}

适配器

package com.example.dell.recylerveiw;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
    private Context context;
    private ArrayList<String> list;

    public MyAdapter(Context context, ArrayList<String> list) {
        this.context = context;
        this.list = list;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = View.inflate( context,R.layout.item,null );
        MyViewHolder viewHolder = new MyViewHolder( view );
        viewHolder.text = view.findViewById( R.id.textView );
        return viewHolder;
    }
    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, final int position) {
        holder.text.setText( list.get( position ) );
        holder.text.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Toast.makeText( context, position+"", Toast.LENGTH_SHORT ).show();
                notifyItemRemoved( position );

                listener.setOnItemClickListener( position );
                handler.sendEmptyMessageDelayed( 1000,1000 );
            }
        } );
    }
    //条目动画 使用handler发送
    private Handler handler = new Handler(  ){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage( msg );
            if (msg.what == 1000){
                notifyDataSetChanged();
            }
        }
    };

    @Override
    public int getItemCount() {
        return list.size();
    }
    public class MyViewHolder extends RecyclerView.ViewHolder{

        public MyViewHolder(View itemView) {
            super( itemView );
        }
        TextView text;
    }
    //设置点击事件接口
    public setOnClickItem listener;
    public void setOnClickItem( setOnClickItem listener){
        this.listener = listener;
    }
    public interface setOnClickItem{
        void setOnItemClickListener(int position);
    }
}

activity_main.xml

//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=".MainActivity">

    <Button
        android:id="@+id/click"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击切换" />

    <Button
        android:id="@+id/click2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击切换2" />

    <Button
        android:id="@+id/click3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点击切换3" />

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

//条目布局

<?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"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView"
        android:layout_margin="5dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="测试文字"
        android:textSize="20dp" />
    <View
        android:layout_width="wrap_content"
        android:layout_height="2dp"/>

</LinearLayout>