而在實現完瀑布流後，覺得滑動到底部時，最後一行的高度，沒有佔滿外部View，感覺不太好。（真正的瀑布流應該是條目數近乎無窮，可以一直載入更多）

既然是瀑布流，那麼就選用StaggeredGridLayoutManager。
mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL)); //縱向3列

import android.content.Context;
import android.support.annotation.Nullable;
import
 
 android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

import java.util.Arrays;

/**
 * 實現了滑動到底部的處理，暫未新增自定義監聽器
 * 實現了當LayoutManger是StaggeredGridLayoutManager時，滑到底部的那一行上的子view高度佔滿RecyclerView
 *
 * author : stone
 * email  : 
 
[email protected]
 * time   : 16/5/6 14 23
 */
public class RichRecyclerView extends RecyclerView {

    public RichRecyclerView(Context context) {
        this(context, null);
    }

    public RichRecyclerView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public
 
 RichRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthSpec, int heightSpec) {
        super.onMeasure(widthSpec, heightSpec);
    }

    @Override
    public void onScrollStateChanged(int state) {
        if (state == RecyclerView.SCROLL_STATE_IDLE) {
            LayoutManager layoutManager = getLayoutManager();
            if (layoutManager instanceof StaggeredGridLayoutManager) {
                StaggeredGridLayoutManager lm = (StaggeredGridLayoutManager) layoutManager;
//                int columnCount = lm.getColumnCountForAccessibility(null,null);//列數
                int columnCount = lm.getSpanCount();
//                System.out.println("----" +"columnCount" + columnCount);
                int positions[] = new int[columnCount];
                lm.findLastVisibleItemPositions(positions);//新增 可見的最後一行的 position 資料到陣列 positions
                System.out.println("----" +Arrays.toString(positions));
                for (int i = 0; i < positions.length; i++) {
//                    System.out.println("當前檢視上的最後可見列的位置" + positions[i]);
                }
                for (int i = 0; i < positions.length; i++) {
                    /**
                     * 判斷lastItem的底邊到recyclerView頂部的距離
                     * 是否小於recyclerView的高度
                     * 如果小於或等於 說明滾動到了底部
                     */
                    if (positions[i] >= lm.getItemCount() - columnCount) {
//                        System.out.println("滑動到底了1");

//                        System.out.println("總adapter的條目數:" + lm.getItemCount()); //內部取的adapter的方法
//                        System.out.println("總的列數：" + columnCount);
//                        System.out.println("符號條件的最後可見列上的position" + positions[i]);

                        View child = lm.findViewByPosition(positions[i]);
                        ViewGroup.LayoutParams layoutParams = child.getLayoutParams();
                        layoutParams.height = getHeight() - child.getBottom() + child.getHeight();
                        child.setLayoutParams(layoutParams);
                    }
                }
                int[] into = new int[columnCount];
                lm.findFirstCompletelyVisibleItemPositions(into);
                for (int i = 0; i < into.length; i++) {
                    System.out.println("首次完全可見的view位置：" + into[i]);
                }

                lm.findFirstVisibleItemPositions(into);
                for (int i = 0; i < into.length; i++) {
                    System.out.println("首次可見的view位置(即使部份可見)：" + into[i]);
                }

            } else if (layoutManager instanceof LinearLayoutManager){
                LinearLayoutManager lm = (LinearLayoutManager) layoutManager;
                int position = lm.findLastVisibleItemPosition();
                if (position + 1 == lm.getItemCount()) {
                    System.out.println("滑動到底了2");

                }
            }
        }
        super.onScrollStateChanged(state);
    }
}

相應的adapter：

/**
 * author : stone
 * email  : [email protected]
 * time   : 16/4/9 16 22
 */
public class StaggeredAdapter extends BaseRecyclerViewAdapter<String> {

    private List<Integer> mWHs; //寬或高
    private int mOrientation;

    public StaggeredAdapter(Context context, int layoutID, List<String> datas, int orientation) {
        super(context, layoutID, datas);
        this.mWHs = new ArrayList<>();
        this.mOrientation = orientation;

        for (int i = 0, len = datas.size(); i < len; i++) {
            if (mOrientation == StaggeredGridLayoutManager.VERTICAL) {
                mWHs.add((int) (100 + Math.random() * 100));
            } else {
                mWHs.add((int) (80 + Math.random() * 100));
            }
        }

    }

    @Override
    public void onBindViewHolderSetData(@NonNull BaseRecyclerViewHolder holder, int position) {

        holder.itemView.setBackgroundColor(getColor());

        String str = getItem(position);
        holder.setText(R.id.tv_text, str);

        ViewGroup.LayoutParams params = holder.itemView.getLayoutParams();
        if (params == null) {
            params = new ViewGroup.LayoutParams(-2, -2);
        }
        if (mOrientation == StaggeredGridLayoutManager.VERTICAL) {
//            holder.itemView.setMinimumHeight(mWHs.get(position));//該方法改變itemview高度，並requestLayout()，子view沒有重新請求layout
            params.height = mWHs.get(position);
        } else {
//            holder.itemView.setMinimumWidth(mWHs.get(position));
            params.width = mWHs.get(position);
        }
        holder.itemView.setLayoutParams(params);


    }


    /**
     * 隨機顏色
     *
     * @return
     */
    @CheckResult
    private int getColor() {
        StringBuilder sb = new StringBuilder();
        Random random = new Random();
        String temp;
        for (int i = 0; i < 3; i++) {
            temp = Integer.toHexString(random.nextInt(0xFF));
            if (temp.length() == 1) {
                temp = "0" + temp;
            }
            sb.append(temp);
        }
        return Color.parseColor("#" + sb.toString());
    }
}

item_adapter.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/sel_item_back">

    <TextView
        android:id="@+id/tv_text"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:gravity="center"/>
</RelativeLayout>