欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

RecyclerView每个Position显示不同布局

程序员文章站 2022-06-17 22:41:13
1.写多个布局作为ViewType插入每个Position中2.写adpater(1)用一个list来存放数据(2)为每一个ViewType创建ViewHolder类来获取布局中的view(3)onCreateViewHolder:创建holder,将view传入(4)onBindViewHolder:将资源放入holder中的view(5)getItemViewType:设置每个position对应的ViewType3.写fragment/activity(1)init数据...

1.写多个布局作为ViewType插入每个Position中

2.写adpater

(1)用一个list来存放数据

(2)为每一个ViewType创建ViewHolder类来获取布局中的view

(3)onCreateViewHolder:创建holder,将view传入

(4)onBindViewHolder:将资源放入holder中的view

(5)getItemViewType:设置每个position对应的ViewType

3.写fragment/activity

(1)init数据():将数据存入list中

(2)createContentView:inflat、init数据 、new Adapter。。。

 

1.布局:

(1)picture_item

<?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">
    <ImageView
        android:id="@+id/picture_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/picture_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_marginLeft="10dp"/>

</LinearLayout>

(2)picture_describe

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/picture_describe"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_marginLeft="10dp"/>

</RelativeLayout>

(3)activity_main

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />

</androidx.constraintlayout.widget.ConstraintLayout>

2.Picture类

package com.example.recyclerviewdemo;

public class Picture {
    private String name;
    private int imageId;
    private String describe;
    public Picture(String name,int imageId,String describe){
        this.name=name;
        this.imageId=imageId;
        this.describe=describe;
    }
    public String getName(){
        return name;
    }
    public int getImageId(){
        return imageId;
    }
    public String getDescribe(){
        return describe;
    }
}

3.Adapter

package com.example.recyclerviewdemo;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;


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

import java.util.List;

public class PictureAdapter extends RecyclerView.Adapter {

    private List<Picture> mPictureList;

    static class NameHolder extends RecyclerView.ViewHolder {
        ImageView pictureImage;
        TextView pictureName;

        public NameHolder(View view) {
            super(view);
            pictureImage = (ImageView) view.findViewById(R.id.picture_image);
            pictureName = (TextView) view.findViewById(R.id.picture_name);
        }

    }
    static class DescribeHolder extends RecyclerView.ViewHolder {
        TextView pictureDescribe;

        public DescribeHolder(View view) {
            super(view);
            pictureDescribe = (TextView) view.findViewById(R.id.picture_describe);
        }

    }

    public PictureAdapter(List<Picture> pictureList) {
        mPictureList = pictureList;
    }

    @Override

    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType) {
            case 0:
                View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.picture_item, parent, false);
                NameHolder nameHolder = new NameHolder(view);
                return nameHolder;
            case 1:
                View view2 = LayoutInflater.from(parent.getContext()).inflate(R.layout.pixture_describe, parent, false);
                DescribeHolder describeHolder = new DescribeHolder(view2);
                return describeHolder;
        }
        return null;
    }


    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        Picture picture=mPictureList.get(position);
        if (holder instanceof NameHolder){
            NameHolder nameHolder=(NameHolder) holder;
            nameHolder.pictureImage.setImageResource(picture.getImageId());
            nameHolder.pictureName.setText(picture.getName());
        }
        else if(holder instanceof DescribeHolder){
            DescribeHolder describeHolder=(DescribeHolder) holder;
            describeHolder.pictureDescribe.setText(picture.getDescribe());
        }

    }

    @Override
    public int getItemCount() {
        return mPictureList.size();
    }

    @Override
    public int getItemViewType(int position) {
        if (position % 2 == 0) {
            return 0;
        } else {
            return 1;
        }
    }
}

4.MainActivity

package com.example.recyclerviewdemo;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
        import androidx.recyclerview.widget.LinearLayoutManager;
        import androidx.recyclerview.widget.RecyclerView;

        import android.content.ServiceConnection;
        import android.media.MediaPlayer;
        import android.os.Bundle;

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

public class MainActivity extends AppCompatActivity {

    private List<Picture> fruitList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initFruits();
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        PictureAdapter adapter = new PictureAdapter(fruitList);
        recyclerView.setAdapter(adapter);
    }

    private void initFruits() {
        for (int i = 0; i < 2; i++) {
            Picture apple = new Picture("Apple", R.drawable.apple_pic,"不爱吃");
            fruitList.add(apple);
            Picture banana = new Picture("Banana", R.drawable.banana_pic,"不爱吃");
            fruitList.add(banana);
            Picture orange = new Picture("Orange", R.drawable.orange_pic,"爱吃");
            fruitList.add(orange);
            Picture watermelon = new Picture("Watermelon", R.drawable.watermelon_pic,"爱吃");
            fruitList.add(watermelon);
            Picture pear = new Picture("Pear", R.drawable.pear_pic,"不爱吃");
            fruitList.add(pear);
            Picture grape = new Picture("Grape", R.drawable.grape_pic,"爱吃");
            fruitList.add(grape);
            Picture pineapple = new Picture("Pineapple", R.drawable.pineapple_pic,"爱吃");
            fruitList.add(pineapple);
            Picture strawberry = new Picture("Strawberry", R.drawable.strawberry_pic,"爱吃");
            fruitList.add(strawberry);
            Picture cherry = new Picture("Cherry", R.drawable.cherry_pic,"爱吃");
            fruitList.add(cherry);
            Picture mango = new Picture("Mango", R.drawable.mango_pic,"爱吃");
            fruitList.add(mango);

        }
    }
}

 

本文地址:https://blog.csdn.net/m0_37934678/article/details/107943559

相关标签: 安卓