Android RecycleView上拉加載BaseAdapter(二)

package com.odoo.core.support.adapter;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.odoo.R;
import com.odoo.core.orm.ODataRow;
import com.odoo.core.orm.OModel;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by WangXM on 2016/6/1.
 */
public abstract class BaseRecyclerViewAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter {


    private static final int TYPE_ITEM = 0;  //普通Item View
    private static final int TYPE_FOOTER = 1;  //頂部FootView
    public static final int FOOTer_LOADING = 1;
    public static final int FOOTER_LOAD_MORE = 2;
    public static final int FOOTER_NO_ITEM = 0;

    private int footerType = FOOTER_LOAD_MORE;

    protected List<ODataRow> mList = new ArrayList<>();
    protected Context mContext;

    public BaseRecyclerViewAdapter(List<ODataRow> list, Context context) {
        mList = list;
        mContext = context;
    }

    public int getFooterType() {
        return footerType;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == TYPE_ITEM) {
            return onCreateMyViewHolder( parent, viewType);
        } else {
            View view = LayoutInflater.from(mContext).inflate(R.layout.item_recycleview_footer, parent, false);
            FootHolder holder = new FootHolder(view);
            return holder;
        }
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (position < mList.size()) {
            onBindMyViewHolder((VH) holder,position);
        } else {

            if (footerType == FOOTER_LOAD_MORE)
                ((FootHolder) holder).tvContent.setText("上拉加載更多數據");
            else if (footerType == FOOTER_NO_ITEM)
                ((FootHolder) holder).tvContent.setText("已經是最後一頁，沒有數據了");
            else
                ((FootHolder) holder).tvContent.setText("正在加載更多數據。。。");
        }
    }


    @Override
    public int getItemCount() {
        return mList.size() + 1;
    }

    @Override
    public int getItemViewType(int position) {
        if (position < mList.size()) {
            return TYPE_ITEM;
        } else {
            return TYPE_FOOTER;
        }
    }

    public void loading() {
        this.footerType = FOOTer_LOADING;
        notifyDataSetChanged();
    }

    public void addItem() {
        this.footerType = FOOTER_LOAD_MORE;
        notifyDataSetChanged();

    }

    public void addItemNoNext() {
        this.footerType = FOOTER_NO_ITEM;
        notifyDataSetChanged();

    }



    class FootHolder extends RecyclerView.ViewHolder {
        public TextView tvContent;

        public FootHolder(View itemView) {
            super(itemView);
            tvContent = (TextView) itemView.findViewById(R.id.tv_footer_context);
        }
    }



    public abstract VH onCreateMyViewHolder(ViewGroup parent, int viewType);
    public abstract void onBindMyViewHolder(VH holder, int position);
}