jiecheng-business/app/src/main/java/com/pukka/jiecheng/base/BaseRecyclerAdapter.java

package com.pukka.jiecheng.base;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

/**
 * @author MajorLL
 */
public abstract class BaseRecyclerAdapter<T> extends RecyclerView.Adapter<BaseRecyclerViewHolder<T>> {
    /**
     * 源数据
     */
    protected List<T> mData;
    /**
     * item 点击事件
     */
    protected BaseOnItemClickListener<T> onItemClickListener = null;

    /**
     * item 焦点变化事件
     */
    protected BaseOnItemFocusChangeListener<T> onItemFocusChangeListener = null;


    /**
     * 获取当前布局资源文件ID
     *
     * @param viewType viewType类型
     * @return 返回资源ID
     */
    protected abstract int getLayoutId(int viewType);

    /**
     * 获取对应ViewHolder
     *
     * @param view
     * @param viewType
     * @return
     */
    public abstract BaseRecyclerViewHolder<T> getViewHolder(View view, int viewType);

    public BaseRecyclerAdapter(@NonNull List<T> mData) {
        this.mData = mData;
    }

    /**
     * 获取对应位置泛型数据对象
     *
     * @param position 位置
     * @return 泛型数据
     */
    protected T getIndexData(int position) {
        if (mData == null || mData.size() <= position) {
            return null;
        }
        return mData.get(position);
    }

    @NonNull
    @Override
    public BaseRecyclerViewHolder<T> onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(getLayoutId(viewType), parent, false);
        return getViewHolder(view, viewType);
    }

    @Override
    public void onBindViewHolder(@NonNull BaseRecyclerViewHolder<T> holder, int position) {
        holder.setData(getIndexData(position));
        final int index = position;
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                holder.onItemClick(v, index, getIndexData(index));
                if (onItemClickListener != null) {
                    onItemClickListener.onItemClick(v, index, getIndexData(index));
                }
            }
        });
        holder.itemView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                holder.onItemFocusChange(v, hasFocus);
                if (onItemFocusChangeListener != null) {
                    onItemFocusChangeListener.onItemFocusChange(v, hasFocus, index, getIndexData(index));
                }
            }
        });
    }

    @Override
    public int getItemCount() {
        if (mData == null) {
            return 0;
        }
        return mData.size();
    }


    /**
     * 获取空页面数量
     * @return 空页面数量
     */
    public int getEmptyCount() {
        if (mData == null) {
            return 0;
        }
        int index = 0;
        for (T mDatum : mData) {
            if (mDatum == null) {
                index++;
            }
        }
        return index;
    }

    @Override
    public int getItemViewType(int position) {
        return super.getItemViewType(position);
    }

    /**
     * 设置对应得Item点击事件
     *
     * @param onItemClickListener item点击事件回调
     */
    public void setOnItemClickListener(BaseOnItemClickListener<T> onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

    /**
     * 设置对应item焦点事件
     *
     * @param onItemFocusChangeListener item焦点事件回调
     */
    public void setOnItemFocusChangeListener(BaseOnItemFocusChangeListener<T> onItemFocusChangeListener) {
        this.onItemFocusChangeListener = onItemFocusChangeListener;
    }
}