Android Studio学习（十二）-RecyclerView列表

Android Studio学习（十二）-RecyclerView列表

使用recyclerview需要导入.jar包

在bulid.gradle中加入一行

implementation 'androidx.recyclerview:recyclerview:1.1.0'

activity_main.xml中设置列表样式

在recyclerview_list.xml中设置列表中每一项的样式

在MyAdapter.java中创建适配器，将数据传递给recyclerview，并实现监听器

package com.example.myapplication;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.baseAdapter;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

public class MyAdapter extends RecyclerView.Adapter {


    private List data;
    private Context context;

    public MyAdapter(List data, Context context) {
        this.data = data;
        this.context = context;
    }

    @NonNull
    @Override
    public MyAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = View.inflate(context,R.layout.recyclerview_list,null);//得到每一个子模块的样式
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyAdapter.MyViewHolder holder, int position) {
        holder.tv.setText(data.get(position).getName());
    }

    @Override
    public int getItemCount() {

        return data==null?0:data.size();
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {

        private TextView tv;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            tv = itemView.findViewById(R.id.tv);

            itemView.setonClickListener(new View.onClickListener(){

                @Override
                public void onClick(View view) {
                    if(onRecyclerItemClickListener!=null){
                        onRecyclerItemClickListener.onRecyclerItemClick(getAdapterPosition());
                    }
                }
            });
        }
    }
    private onRecyclerItemClickListener onRecyclerItemClickListener;

    public void setonRecyclerItemClickListener(onRecyclerItemClickListener listener){
        onRecyclerItemClickListener = listener;
    }
    public interface OnRecyclerItemClickListener{
        void onRecyclerItemClick(int position);
    }
}

在bean.java中设置数据类型

package com.example.myapplication;

public class Bean {
    String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

在MainActivity.java中创建列表中每一项的信息，并创建监听器

package com.example.myapplication;

import androidx.appcompat.app.alertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.app.NotificationCompat;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.media.audiofx.DynamicsProcessing;
import android.nfc.Tag;
import android.os.Build;
import android.os.Bundle;
import android.provider.FontsContract;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.PopupMenu;
import android.widget.PopupWindow;
import android.widget.ProgressBar;
import android.widget.TextView;


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

import javax.security.auth.login.LoginException;

public class MainActivity extends AppCompatActivity {
    private List data = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);//R文件自动生成，不可修改，创建的资源都会在R文件中生成一个索引

        for(int i=0;i<100;i++)
        {
            Bean bean=new Bean();
            bean.setName("zhang"+i);
            data.add(bean);
        }
        RecyclerView recyclerView = findViewById(R.id.rv);//recyclerView得到界面
       // LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);//给recyclerView创建布局
       // recyclerView.setLayoutManager(linearLayoutManager);

        GridLayoutManager gridLayoutManager = new GridLayoutManager(this,3);
        recyclerView.setLayoutManager(gridLayoutManager);
        
        //StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(3, LinearLayout.VERTICAL);
        //recyclerView.setLayoutManager(staggeredGridLayoutManager);//不建议用

        MyAdapter myAdapter = new MyAdapter(data,this);//把数据传给myAdapter
        recyclerView.setAdapter(myAdapter);//通过myAdapter把数据传给recyclerView
        myAdapter.setonRecyclerItemClickListener(new MyAdapter.onRecyclerItemClickListener() {
            @Override
            public void onRecyclerItemClick(int position) {
                Log.e("lala", "onRecyclerItemClick: "+position );
            }
        });
    }




}