Java

RecyclerView适配器的封装及实现

文章目录
  1. 一.封装万能适配器BaseAdapter
  2. 二.实现Adapter

一.封装万能适配器BaseAdapter

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/**
 * 支持传任意布局和任意实体类
 * 支持增删改查
 * 支持长按、点击事件
 *  //public abstract class A<T,VH extends A.ViewHolderJava<T>> extends RecyclerView.Adapter<VH>
 */
public abstract class BaseRecyclerAdapter<T,VH extends BaseRecyclerAdapter.BaseHolder>
        extends RecyclerView.Adapter<VH>{

    private List<T> datas = null;
    private Context context;
    protected int itemlayoutid; //行布局id


    public BaseRecyclerAdapter(List<T> datas,Context context){
        this.datas = datas;
        this.context = context;
    }
    public BaseRecyclerAdapter(List<T> datas){
        this.datas = datas;
    }

    @NonNull
    @Override
    public abstract VH onCreateViewHolder(@NonNull ViewGroup viewGroup, int i);

    @Override
    public void onBindViewHolder(@NonNull VH baseHolder, int i) {

        bindView_Holder(baseHolder,i);
    }

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

    public abstract int setItemLayout();

    public abstract void bindView_Holder(BaseRecyclerAdapter.BaseHolder baseHolder,int position);


    /**
     * 内部类holder
     */
   public abstract class BaseHolder extends RecyclerView.ViewHolder{

        public BaseHolder(@NonNull View itemView) {
            super(itemView);
            bindItem(itemView);
        }
        public abstract void bindItem(View view);
    }

}

二.实现Adapter

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public class SubAdapter extends BaseRecyclerAdapter{

    ArrayList<Bean.T1348647853363Bean> datas;
    Context context;
    OnClickRecycler clickRecycler;

    public SubAdapter(ArrayList<Bean.T1348647853363Bean> datas, Context context,OnClickRecycler onClickRecycler){
        super(datas,context);
        this.datas = datas;
        this.context = context;
        this.clickRecycler = onClickRecycler;
    }

    public SubAdapter(ArrayList<Bean.T1348647853363Bean> datas){
        super(datas);
        this.datas = datas;

    }

    public void setContext(Context context){
        this.context = context;
    }

    public void setOnClickRecycler(OnClickRecycler onClickRecycler){
        this.clickRecycler = onClickRecycler;
    }

    @NonNull
    @Override
    public BaseHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(context).inflate(setItemLayout(),viewGroup,false);
        SubAdapter.SubHolder subHolder = new SubAdapter.SubHolder(view);

        return subHolder;
    }


    @Override
    public int setItemLayout() {
        return R.layout.itemlayout;
    }

    @Override
    public void bindView_Holder(BaseHolder baseHolder, final int position) {
        SubAdapter.SubHolder subHolder = (SubAdapter.SubHolder)baseHolder;
        Glide.with(context).load(datas.get(position).getImgsrc()).into(subHolder.imageView);

        //修改行布局高度
        ViewGroup.LayoutParams params = subHolder.textView.getLayoutParams();
        int endHeight =(int) (200+Math.random()*(400-200+1));
        params.height = endHeight;
        subHolder.textView.setLayoutParams(params);

        subHolder.textView.setText(datas.get(position).getTitle());
        subHolder.imageView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                clickRecycler.longClickRecycler(position);
                return true;
            }
        });
        subHolder.textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                clickRecycler.clickRecycler(position);
            }
        });
    }


    public void addData(Bean.T1348647853363Bean data){
        if(data!= null){
            datas.add(data);
            notifyItemInserted(datas.size()-1);
        }
    }

    public void addDatas(ArrayList<Bean.T1348647853363Bean> allData){
        if(datas != null && datas.size()> 0){
            int startIndex = datas.size();
            datas.addAll(allData);
            int endIndex = datas.size();
            notifyItemRangeInserted(startIndex,endIndex);
        }
    }

    public void removeData(int postion){
        if(postion<= datas.size()){
            datas.remove(postion);
            notifyItemChanged(postion);

        }
    }

    public void removeAll(){
        datas.clear();
        notifyDataSetChanged();
    }


    class SubHolder extends BaseHolder{

        private TextView textView;
        private ImageView imageView;

        public SubHolder(@NonNull View itemView) {
            super(itemView);
        }

        @Override
        public void bindItem(View view) {
            textView = view.findViewById(R.id.txt_item);
            imageView = view.findViewById(R.id.img_item);
        }
    }
}