监听RecyclerView滑动到末端

效果图

实现

1. 添加滑动到末端的接口

package com.kongqw.recyclerviewdemo;/** * Created by kongqw on 2016/2/14. */public interface OnBottomListener {
         public void onBottom();}

2. 重写RecyclerView.OnScrollListener

package com.kongqw.recyclerviewdemo;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;/** * Created by kongqw on 2016/2/14. */public class OnRecyclerViewScrollListener extends RecyclerView.OnScrollListener implements OnBottomListener {
         public enum LAYOUT_MANAGER_TYPE {        LINEAR,        GRID,        STAGGERED_GRID    }    /**     * layoutManager的类型（枚举）     */    protected LAYOUT_MANAGER_TYPE layoutManagerType;    /**     * 最后一个的位置     */    private int[] lastPositions;    /**     * 最后一个可见的item的位置     */    private int lastVisibleItemPosition;    /**     * 当前滑动的状态     */    private int currentScrollState = 0;    @Override    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {        super.onScrolled(recyclerView, dx, dy);        RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();        if (layoutManagerType == null) {            if (layoutManager instanceof LinearLayoutManager) {                layoutManagerType = LAYOUT_MANAGER_TYPE.LINEAR;            } else if (layoutManager instanceof GridLayoutManager) {                layoutManagerType = LAYOUT_MANAGER_TYPE.GRID;            } else if (layoutManager instanceof StaggeredGridLayoutManager) {                layoutManagerType = LAYOUT_MANAGER_TYPE.STAGGERED_GRID;            } else {                throw new RuntimeException("Unsupported LayoutManager used. Valid ones are LinearLayoutManager, GridLayoutManager and StaggeredGridLayoutManager");            }        }        switch (layoutManagerType) {            case LINEAR:                lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();                break;            case GRID:                lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();                break;            case STAGGERED_GRID:                StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;                if (lastPositions == null) {                    lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];                }                staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);                lastVisibleItemPosition = findMax(lastPositions);                break;        }    }    @Override    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {        super.onScrollStateChanged(recyclerView, newState);        currentScrollState = newState;        RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();        int visibleItemCount = layoutManager.getChildCount();        int totalItemCount = layoutManager.getItemCount();        if ((visibleItemCount > 0 && currentScrollState == RecyclerView.SCROLL_STATE_IDLE && (lastVisibleItemPosition) >= totalItemCount - 1)) {            onBottom();        }    }    @Override    public void onBottom() {        // Log.d(TAG, "滑动到了底部");    }    private int findMax(int[] lastPositions) {        int max = lastPositions[0];        for (int value : lastPositions) {            if (value > max) {                max = value;            }        }        return max;    }}

3. 回调

recyclerView.addOnScrollListener(new OnRecyclerViewScrollListener() {    @Override    public void onBottom() {        super.onBottom();        Toast.makeText(getApplicationContext(), "滑动到了末端", Toast.LENGTH_SHORT).show();    }});