17. RecyclerView

Android基础开发——RecyclerView

17. RecyclerView

17.1 导包

implementation 'androidx.recyclerview:recyclerview:1.2.1'

17.2 Bean类与ListView相同

package com.dingjiaxiong.myrecyclerview;

public class Bean {

    String name;

    public String getName() {
        return name;
    }

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

17.3 主布局
<?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"
    >

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

</LinearLayout>

17.4 item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">

    <TextView
        android:id="@+id/tv"
        android:textSize="30sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

与ListView的item一样

17.5 生成数据

17.6 辅助类——Adapter
package com.dingjiaxiong.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> {

    //传入数据
    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) {
        //绑定数据
        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);
        }
    }
}

17.7 配置
package com.dingjiaxiong.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 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("dingjiaxiong" + i);
            data.add(bean);
        }

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

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

        MyAdapter myAdapter = new MyAdapter(data, this);

        recyclerView.setAdapter(myAdapter);

    }
}

运行

17.8 网格的Manager

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

17.9 瀑布流布局

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

改下数据

使用网格布局显示

17.10 item点击事件

默认没有提供

1. 创建接口

设置监听

3.使用

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

 

1. 

运行