RecyclerView用法

有个自定义回调好好看看

    private OnRecyclerItemClickListener mOnItemClickListener;

    public void setRecyclerItemClickListener(OnRecyclerItemClickListener listener) {
        mOnItemClickListener = listener;
    }

    public interface OnRecyclerItemClickListener {
        void onRecyclerItemClick(int position);
    }

// 添加 RecyclerView 的依赖包
    implementation 'androidx.recyclerview:recyclerview:1.1.0'

package com.enjoy.leo_recyclerview;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;

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 = 9000; i < 20000; i++) {
            if (i % 4 != 0) {
                continue;
            }
            Bean bean = new Bean();
            bean.setName("享学" + i);
            data.add(bean);
        }

        RecyclerView recyclerView = findViewById(R.id.rv);

//        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
//        recyclerView.setLayoutManager(linearLayoutManager);

        GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 3);
        recyclerView.setLayoutManager(gridLayoutManager);

//        StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(3,
//                LinearLayout.VERTICAL);
//        recyclerView.setLayoutManager(staggeredGridLayoutManager);

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

        myAdapter.setRecyclerItemClickListener(new MyAdapter.OnRecyclerItemClickListener() {
            @Override
            public void onRecyclerItemClick(int position) {
                Log.e("leo", "onRecyclerItemClick: " + position);
            }
        });
    }
}

package com.enjoy.leo_recyclerview;

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);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (mOnItemClickListener != null) {
                        mOnItemClickListener.onRecyclerItemClick(getAdapterPosition());
                    }
                }
            });
        }
    }

    private OnRecyclerItemClickListener mOnItemClickListener;

    public void setRecyclerItemClickListener(OnRecyclerItemClickListener listener) {
        mOnItemClickListener = listener;
    }

    public interface OnRecyclerItemClickListener {
        void onRecyclerItemClick(int position);
    }
}

package com.enjoy.leo_listview;

public class Bean {
    String name;

    public String getName() {
        return name;
    }

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

<?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/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp" />

</LinearLayout>

<?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">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>