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  1. 1. 打造RecyclerView的省略写法

打造RecyclerView的省略写法

之前写过一篇打造万能的ListView适配器，后来学习了Google推出的RecyclerView。同样为了简（偷）便（懒），避免冗长的代码，可以这样来简化。
首先创建ViewHolder类，实现一些getView的方法，如TextView，Button，ImageView…etc.

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public class ViewHolder {

//使用SparseArray来缓存View
    private SparseArray<View> viewHolder;
    private View view;

    public static ViewHolder getViewHolder(View view) {
        ViewHolder viewHolder = (ViewHolder) view.getTag();
        if (viewHolder == null) {
            viewHolder = new ViewHolder(view);
            view.setTag(viewHolder);
        }
        return viewHolder;

    }

    private ViewHolder(View view) {

        this.view = view;
        viewHolder = new SparseArray<>();
        view.setTag(viewHolder);
    }

    public <T extends View> T get(int id) {
        View childView = viewHolder.get(id);
        if (childView == null) {
            childView = view.findViewById(id);
            viewHolder.put(id, childView);
        }
        return (T) childView;
    }

    public View getConvertView() {
        return view;
    }

    public TextView getTextView(int id) {
        return get(id);
    }

    public Button getButton(int id) {
        return get(id);
    }

    public ImageView getImageView(int id) {

        return get(id);
    }
}

接下来创建RecyclerViewHolder类继承字RecyclerView的ViewHolder。

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public class RecyclerViewHolder extends RecyclerView.ViewHolder {
    private ViewHolder mViewHolder;

    public RecyclerViewHolder(View itemView) {
        super(itemView);
        mViewHolder = ViewHolder.getViewHolder(itemView);
    }

    public ViewHolder getViewHolder() {
        return mViewHolder;
    }

}

接下来创建抽象类AutoAdapter继承RecyclerView的Adapter，

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public abstract class AutoRVAdapter extends RecyclerView.Adapter<RecyclerViewHolder> {
    public List<?> mList;
    private Context mContext;

    private AdapterView.OnItemClickListener listener;

    public abstract int onCreateViewLayoutID(int viewType);

    public abstract void onBindViewHolder(ViewHolder holder, int position);

    public void setOnItemClickListener(
    AdapterView.OnItemClickListener listener) {
        this.listener = listener;
    }

    public AutoRVAdapter(Context context, List<?> list) {
        this.mContext = context;
        this.mList = list;
    }


    @Override
    public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(mContext).inflate(onCreateViewLayoutID(viewType), parent,false);


        return new RecyclerViewHolder(view);
    }


    @Override
    public void onBindViewHolder(final RecyclerViewHolder holder, final int position) {

        onBindViewHolder(holder.getViewHolder(), position);
        if (listener != null) {
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    listener.onItemClick(null, v, position, holder.getItemId());
                }
            });
        }
    }

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

到现在我们已经把Adapter的过程封装起来，使用的时候只需继承AutoRVAdapter实现其抽象方法即可。

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public class TestAdapter extends AutoRVAdapter {

    public TestAdapter(Context context, List<?> list) {
        super(context, list);
    }

    @Override
    public int onCreateViewLayoutID(int viewType) {
        return R.layout.item_row;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        String item = (String) mList.get(position);
        holder.getTextView(R.id.id_textview).setText(item);
        holder.getImageView(R.id.iv_img).setImageResource(R.mipmap.ic_launcher);
    }
}

通过以上步骤我们就将整个过程封装起来，只要使用RecyclerView的时候将代码复制过去继承AutoRVAdapter，重写方法即可，非常方便。

文章目录
  1. 1. 打造RecyclerView的省略写法