Android列表总结

一、Listview
二、Gridview
三、RecyclerView

1. 添加依赖

implementation 'com.android.support:recyclerview-v7:28.0.0'

2. 布局中添加 RecyclerView

<android.support.v7.widget.RecyclerView
            android:id="@+id/rv"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scrollbars="none" />

3. 适配器

public class ArticleListAdatper extends RecyclerView.Adapter<ArticleListAdatper.MyViewHolder> {

    private List<ArticleListBean.DataBean.ListBean> usefulThingBeanLists;
    private Context context;
    
    public ArticleListAdatper(List<ArticleListBean.DataBean.ListBean> usefulThingBeanLists, Context usefulThingListActivity) {
        this.usefulThingBeanLists = usefulThingBeanLists;
        this.context = usefulThingListActivity;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(context).inflate(R.layout.item_useful_thing, viewGroup, false);
        MyViewHolder viewHolder = new MyViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder viewHolder, int i) {
        final ArticleListBean.DataBean.ListBean listBean = usefulThingBeanLists.get(i);
        Picasso.with(context)
                .load(listBean.getCoverUrl())
                .into(viewHolder.iv_article_picture);
    }

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

    static class MyViewHolder extends RecyclerView.ViewHolder {
        //布局中的id
        ImageView iv_article_picture;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            iv_article_picture = itemView.findViewById(R.id.iv_article_picture);
        }
    }
}

适配器解释：
①首先自定义一个适配器ArticleListAdatper 集成自RecyclerView,Adapter，并将泛型指定为ArticleListAdatper.MyViewHolder；
②自定义MyViewHolder继承自 RecyclerView.ViewHolder，里边实现获取条目布局id的功能；
③重写方法 RecyclerView.ViewHolder，通过布局加载器加载条目布局，创建MyHolderVIew对象并返回；
④重写方法onBindViewHolder，用来赋值、加载图片、点击事件；
⑤重写方法getItemCount；
⑥该适配器的构方法，带有数据和上下文。

4. 使用recyclerview

RecyclerView rv = (RecyclerView )findviewById(R.id.rv);
LinerLayoutManager linearLayoutManager= new LInerLayoutManager(this);
//设置列表方向，默认为纵向滚动
linearLayoutManager.setOrientation(LInerLayoutManager.HORIZONTAL);
ArticleListAdatper adatper = new ArticleListAdatper(List, mContext);
rv.setAdapter(articleListAdatper);

除了LinerLayoutManager之外，还提供了GridLayoutManager（网格布局）和StaggerGridLayoutManager（瀑布流布局）。