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Android 发布时间：2022-04-28 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了android – 创建通用基础适配器？，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

我有兴趣创建一个通用的BaseAdapter,它将应用于任何具有任何list_item的ListView.它将为list_view设置item_row.

public class GenericAdapter extends BaseAdapter
    {

    Context context;

    ArrayList<HashMap<String,String>> list;

    LayoutInflater inflater;

    public GenericAdapter (Context context,ArrayList<HashMap<String,String>> list) 
        {
            this.context = context;

            this.list = list;

            inflater = (LayoutInflater) context.getSystemservice(Context.LAYOUT_INFLATER_serviCE);
    }

        @Override
        public int getCount()
        {
            return list.size();
        }

        @Override
        public Object getItem(int position)
        {   
            return list.get(position);
        }

        @Override
        public long getItemId(int position)
        {   
            return position;
        }

        @Override
        public View getView(int position,View convertView,ViewGroup parent)
        {
            View view = convertView;

          if(view == null)
           {
            view = inflater.inflate(R.layout.item_of_any_list,parent,falsE);

// i have to do something here like there may be a method which must be call 

           }

            /*HashMap<String,String> map = list.get(position);

            TextView textViewName = (TextView) view.findViewById(R.id.Name);

            TextView textViewDate = (TextView) view.findViewById(R.id.datE);

            //TextView textViewDesc = (TextView) view.findViewById(R.id.desc);

            textViewName.setText(map.get("name"));

            textViewDate.setText(map.get("date"));

            //textViewDesc.setText(map.get("description"));
    */      
            return view;
        }

我想我必须创建一个接口,为单个项目设置item_row.但我不知道这可能是可能的.有人能告诉我如何实现它.

我的想法是创建一个接口,GenericAdapter实现该接口.在该界面中,有一种获取和设置item_row的方法.任何扩展GenericAdapter的类都必须实现该方法.它将帮助我们制作通用适配器.

当我们扩展该适配器时,我们不需要编写所有代码,如getCount,getItem,getItemId,我们只需要覆盖一个inflateLayout函数.必须在getView中

提前致谢

解决方法

两年后回答我自己的问题.

为了制作通用适配器,您需要父类中的抽象方法,这些方法应该由子实现.因此,GenericAdapter必须是Abstract,并为要更改的数据创建抽象方法.

我有不同类型的ArrayList在Adapter中显示它的模型类是不同的.所以我决定写一个genericAdapter.如果someOne对listview感兴趣,这适用于recyclerview.让我知道.

GenericAdapter

public abstract class GenericAdapter<T> extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private Context context;
    private ArrayList<T> items;

    public abstract RecyclerView.ViewHolder setViewHolder(ViewGroup parent);

    public abstract void onBindData(RecyclerView.ViewHolder holder,T val);

    public GenericAdapter(Context context,ArrayList<T> items){
        this.context = context;
        this.items = items;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent,int viewTypE) {
        RecyclerView.ViewHolder holder = setViewHolder(parent);
        return holder;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder,int position) {
        onBindData(holder,items.get(position));
    }

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

    public void addItems( ArrayList<T> savedCardItemz){
        items = savedCardItemz;
        this.notifyDataSetChanged();
    }

    public T getItem(int position){
        return items.get(position);
    }
}

而且我喜欢它

adapter = new GenericAdapter<DataModel>(context,modelList) {
        @Override
        public RecyclerView.ViewHolder setViewHolder(ViewGroup parent) {
            final View view =            LayoutInflater.from(context).inflate(R.layout.item_view_holder,falsE);
            ItemViewHolder viewHolder = new ItemViewHolder(context,view);
            return viewHolder;
        }

        @Override
        public void onBindData(RecyclerView.ViewHolder holder1,DataModel val) {
                DataModel userModel = val;

                ItemViewHolder holder = (ItemViewHolder)holder1;
                holder.name.setText(userModel.getName());
                holder.fatherName.setText(userModel.getFatherName());
        }
    };
    mRecyclerView.setAdapter(adapter);