【Android】RecyclerView多布局展示案例

return articles;

}

/**

* 数据如何与item布局做关联

* 其实就是根据拿到的不同的viewType创建对应的ViewHolder（不同类型的杯子）

*/

@NonNull

@Override

public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

//找item布局，把item转为视图，与LayoutInflater有异曲同工之处

Log.i(TAG, "onCreateViewHolder: viewType = " + viewType);

switch (viewType) {

case ITEM_TYPE_ARTICLE_2:

View view2 = LayoutInflater.from(parent.getContext())

.inflate(R.layout.item_article_picture2, parent, false);

return new MyViewHolder2(view2);

case ITEM_TYPE_ARTICLE_3:

View view3 = LayoutInflater.from(parent.getContext())

.inflate(R.layout.item_article_picture3, parent, false);

return new MyViewHolder3(view3);

case ITEM_TYPE_AD:

View viewAd = LayoutInflater.from(parent.getContext())

.inflate(R.layout.item_article_ad, parent, false);

return new AdViewHolder(viewAd);

case ITEM_TYPE_ARTICLE_1:

default:

//查找item布局

View view = LayoutInflater.from(parent.getContext())

.inflate(R.layout.item_article_simple, parent, false);

//创建一个ViewHolder对itemView做管理

MyViewHolder myViewHolder = new MyViewHolder(view);

//ViewHolder和RecyclerView做关联

return myViewHolder;

}

}

/**

* 有一条item就调用一次这个方法

*/

@Override

public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {

Log.i(TAG, "onBindViewHolder: position" + position);

//通过position获取对应的viewType

int itemViewType = getItemViewType(position);

Article article = articles.get(position);

switch (itemViewType) {

case ITEM_TYPE_ARTICLE_2:

MyViewHolder2 holder2 = (MyViewHolder2) holder;

holder2.ivPicture1.setImageResource(article.getPicture());

holder2.ivPicture2.setImageResource(article.getPicture2());

holder2.tvTitle.setText(article.getTitle());

holder2.tvAuthor.setText(article.getAuthor());

break;

case ITEM_TYPE_ARTICLE_3:

MyViewHolder3 holder3 = (MyViewHolder3) holder;

holder3.ivPicture1.setImageResource(article.getPicture());

holder3.ivPicture2.setImageResource(article.getPicture2());

holder3.ivPicture3.setImageResource(article.getPicture3());

holder3.tvTitle.setText(article.getTitle());

holder3.tvAuthor.setText(article.getAuthor());

break;

case ITEM_TYPE_AD:

AdViewHolder holderAd = (AdViewHolder) holder;

holderAd.ivPicture.setImageResource(article.getAdPicture());

break;

case ITEM_TYPE_ARTICLE_1:

default:

MyViewHolder holderSimple = (MyViewHolder) holder;

holderSimple.ivPicture.setImageResource(article.getPicture());

holderSimple.tvTitle.setText(article.getTitle());

holderSimple.tvAuthor.setText(article.getAuthor());

break;

}

}

@Override

public int getItemViewType(int position) {

Article article = articles.get(position);

if (article.isIdAd()) {

return ITEM_TYPE_AD;

} else if (article.getPicture2() == 0 && article.getPicture3() == 0) {

return ITEM_TYPE_ARTICLE_1;

} else if (article.getPicture3() == 0) {

return ITEM_TYPE_ARTICLE_2;

} else {

return ITEM_TYPE_ARTICLE_3;

}

}

/**

* @return 告诉RecyclerView显示多少条数据

*/

@Override

public int getItemCount() {

Log.i(TAG, "getItemCount: articles的数量为" + articles);

return articles == null ? 0 : articles.size();

}

public class MyViewHolder extends RecyclerView.ViewHolder {

private final ImageView ivPicture;

private final TextView tvTitle;

private final TextView tvAuthor;

public MyViewHolder(@NonNull View itemView) {

super(itemView);

ivPicture = itemView.findViewById(R.id.iv_picture);

tvTitle = itemView.findViewById(R.id.tv_title);

tvAuthor = itemView.findViewById(R.id.tv_author);

}

}

/**

* 两张图片的ViewHolder

*/

public class MyViewHolder2 extends RecyclerView.ViewHolder {

private final ImageView ivPicture1;

private final ImageView ivPicture2;

private final TextView tvTitle;

private final TextView tvAuthor;

public MyViewHolder2(@NonNull View itemView) {

super(itemView);

ivPicture1 = itemView.findViewById(R.id.iv_picture1);

ivPicture2 = itemView.findViewById(R.id.iv_picture2);

tvTitle = itemView.findViewById(R.id.tv_title);

tvAuthor = itemView.findViewById(R.id.tv_author);

}

}

public class MyViewHolder3 extends RecyclerView.ViewHolder {

private final ImageView ivPicture1;

private final ImageView ivPicture2;

private final ImageView ivPicture3;

private final TextView tvTitle;

private final TextView tvAuthor;

public MyViewHolder3(@NonNull View itemView) {

super(itemView);

ivPicture1 = itemView.findViewById(R.id.iv_picture1);

ivPicture2 = itemView.findViewById(R.id.iv_picture2);

ivPicture3 = itemView.findViewById(R.id.iv_picture3);

tvTitle = itemView.findViewById(R.id.tv_title);

tvAuthor = itemView.findViewById(R.id.tv_author);

}

}

public class AdViewHolder extends RecyclerView.ViewHolder {

private final ImageView ivPicture;

private final View ivClose;

public AdViewHolder(@NonNull View itemView) {

super(itemView);

ivPicture = itemView.findViewById(R.id.iv_picture);

ivClose = itemView.findViewById(R.id.tv_close);

}

}

}代码语言：javascript复制package com.xlong.myapplication.recyclerview;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.LinearLayoutManager;

import androidx.recyclerview.widget.RecyclerView;

import com.xlong.myapplication.R;

import java.util.ArrayList;

/**

* 实现不同的RecyclerView item样式

*/

public class ArticleMoreListActivity extends AppCompatActivity{

private static final String TAG = "ArticleMoreListActivity";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_article_more_list);

//1:找到循环视图

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

//2：一维列表(竖向)

LinearLayoutManager layoutManager = new LinearLayoutManager(this);

//3：为RecyclerView添加布局管理器

recyclerView.setLayoutManager(layoutManager);

//设置适配器

ArticleMoreAdapter adapter = new ArticleMoreAdapter();

//把数据先传给适配器

ArrayList