学习B站‘Android架构解析’【2021最新版】Android（安卓）开发零基础入门课程【全套】

（自学还是要尽量跟着视频敲一敲代码，做做笔记------如有侵权，联系我删除）

1、RecyclerView

MainActivity.java

package com.example.myrecyclerview;

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.widget.ListView;

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

public class MainActivity extends AppCompatActivity {
    private List<Bean> data = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        for (int i = 0;i <100 ;i ++){
            Bean bean = new Bean();
            bean.setName("享学"+i);
            data.add(bean);

        }
        RecyclerView recyclerview = findViewById(R.id.tv);

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        recyclerview.setLayoutManager(linearLayoutManager);

        MyAdapter myAdapter = new MyAdapter(data, this);
        recyclerview.setAdapter(myAdapter);
    }
}

Myadapter.java

package com.example.myrecyclerview;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

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

import java.util.List;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    private List<Bean> data;
    private Context context;

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

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = View.inflate(context,R.layout.recyclerview_item,null);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull 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);
        }
    }
}