介绍
RecyclerView是ListView和GridView的继承者，有它俩的优点，也弥补了它们的不足；RecyclerView使用起来更灵活、简洁、更漂亮，更能实现我们想要的效果。
RecyclerView使用的很广泛，如下面的都能用RecyclerView实现
淘宝
网易云
下面我们就大概做这样的一个效果
使用
1、创建2个布局文件
一个放有RecyclerView组件
一个有是实现的样式xml
activity_mian.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler_test"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="5dp"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
myrecycler.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="110dp"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<ImageView
android:id="@+id/img_picture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_rubbish01"
android:layout_gravity="center_horizontal"
/>
<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="题目"
android:textSize="20dp"
/>
</LinearLayout>
如图:
2、创建bean类用来保存myrecycler.xml中的组件的数据，创建get和set方法
infobean.java
package com.example.xianyu;
public class infoBean {
private int picture;
private String title;
infoBean(int picture,String title){
this.picture = picture;
this.title = title;
}
public int getPicture() {
return picture;
}
public void setPicture(int picture) {
this.picture = picture;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
3、创建适配器，并设置item的点击事件
要点:
(1)、适配器继承自RecyclerView.Adapter
(2)、适配器里的泛型需自定义，并且继承自RecyclerView.ViewHolder，主要是实例化组件
(3)、onBindViewHolder方法，利用传进来的ArrayList，进行绑定数据
(4)、执行顺序:
onCreateViewHolder(找到布局)—>MyViewHolder(找到组件) —>onBindViewHolder(绑定数据)
myadapter.java
package com.example.xianyu;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;
public class myadapter extends RecyclerView.Adapter<myadapter.MyViewHolder>{
private final Context context;
List<infoBean> data = new ArrayList<infoBean>();
/*
自定义的构造方法 ，传入上下文对象context 和data数据
*/
myadapter(Context context, List<infoBean> data){
this.context = context;
this.data = data;
}
/*
getview
*/
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = View.inflate(context,R.layout.myrecycler,null);
return new MyViewHolder(view);
}
/*
绑定数据
*/
@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
infoBean bean = data.get(position);
holder.picture.setImageResource(bean.getPicture());
holder.title.setText(bean.getTitle());
//设置item的点击事件
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(context,bean.getTitle(), Toast.LENGTH_LONG).show();
}
});
}
/*
*得到总条数，返回data.size() 就可以了
*/
@Override
public int getItemCount() {
return data.size();
}
/*
也是getview
*/
class MyViewHolder extends RecyclerView.ViewHolder{
private ImageView picture;
private TextView title;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
picture = itemView.findViewById(R.id.img_picture);
title = itemView.findViewById(R.id.tv_title);
}
}
}
4、在主Activity设置RecyclerView
homeActivity.java
package com.example.xianyu;
import android.app.Activity;
import android.os.Bundle;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;
public class homeActivity extends Activity {
private RecyclerView mrecycler;
List<infoBean> data = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mian);
initDate();
mrecycler = findViewById(R.id.recycler_test);
//设置适配器
mrecycler.setAdapter(new myadapter(homeActivity.this,data));
//设置样式 ,有如下:
// LinearLayoutManager(Context context, @RecyclerView.Orientation int orientation,boolean reverseLayout)
//GridLayoutManager(Context context, int spanCount)
//StaggeredGridLayoutManager(int spanCount, int orientation)
mrecycler.setLayoutManager(new GridLayoutManager(homeActivity.this,3));
}
//数据
private void initDate() {
data.add(new infoBean(R.drawable.ic_rubbish02,"干"));
data.add(new infoBean(R.drawable.ic_rubbish03,"湿"));
data.add(new infoBean(R.drawable.ic_rubbish01,"有害"));
data.add(new infoBean(R.drawable.ic_rubbish04,"其他"));
data.add(new infoBean(R.drawable.ic_rubbish05,"回收"));
data.add(new infoBean(R.drawable.ic_rubbish06,"厨余"));
}
}
实现图:
总结
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转载：https://blog.csdn.net/weixin_44758662/article/details/108942044
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