RecycleView 底部监听

来源：互联网发布：淘宝充值方式编辑：程序博客网时间：2024/06/04 19:36

防京东订单滑动到底部时显示一个正在加载的条目先上图

首先自定义一个类集成RecycleView 重写 onScrollStateChange 和 OnChildAttachedToWindow方法

@Overridepublic void onScrollStateChanged(int state) {    super.onScrollStateChanged(state);   //当滚动状态为停止时开始回调接口 if (state == SCROLL_STATE_IDLE && isBottom) {      onUpLoadListener.upLoad();    }}

@Overridepublic void onChildAttachedToWindow(View child) {    super.onChildAttachedToWindow(child);    UpLoadVH childViewHolder = (UpLoadVH) getChildViewHolder(child);    if (childViewHolder.tag == getAdapter().getItemCount() - 1) {           //当viewHolder的tag与条目数相等时最后一个条目出现在屏幕底部         isBottom = true;    } else {        isBottom = false;    }}

自定义有一个类继承RecycleView的ViewHolder 添加一个tag属性

public class UpLoadVH extends RecyclerView.ViewHolder {    public int tag;    public UpLoadVH(View itemView) {        super(itemView);    }}

在adapter 中给ViewHolder的tag赋值，

@Overridepublic void onBindViewHolder(UpLoadVH holder, int position) {    holder.tag = position;    if (getItemViewType(position) == 0) {        ViewHodlerItem viewHodlerItem = (ViewHodlerItem) holder;        Glide.with(mContext).load(R.drawable.freight).bitmapTransform(new CropCircleTransformation(mContext)).crossFade(1000).into(viewHodlerItem.ivHead);    }}

下面是重写的RecycleView类的全部代码

package com.ruitukeji.logistics.yihaoSecond.customview;import android.content.Context;import android.support.annotation.Nullable;import android.support.v7.widget.RecyclerView;import android.util.AttributeSet;import android.view.View;/** * Created by Administrator on 2017/2/20 0020. */public class UpLoadRecycleView extends RecyclerView {    private boolean isBottom;    private OnUpLoadListener onUpLoadListener;    public void setOnUpLoadListener(OnUpLoadListener onUpLoadListener) {        this.onUpLoadListener = onUpLoadListener;    }    public UpLoadRecycleView(Context context) {        super(context);    }    public UpLoadRecycleView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);    }    @Override    public void onScrollStateChanged(int state) {        super.onScrollStateChanged(state);        if (state == SCROLL_STATE_IDLE && isBottom) {            onUpLoadListener.upLoad();        }    }    @Override    public void onChildAttachedToWindow(View child) {        super.onChildAttachedToWindow(child);        UpLoadVH childViewHolder = (UpLoadVH) getChildViewHolder(child);        if (childViewHolder.tag == getAdapter().getItemCount() - 1) {            isBottom = true;        } else {            isBottom = false;        }    }    public interface OnUpLoadListener {        void upLoad();    }}

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