android.support.v7.widget.StaggeredGridLayoutManager#findLastVisibleItemPositions ( )源码实例Demo

下面列出了android.support.v7.widget.StaggeredGridLayoutManager#findLastVisibleItemPositions ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。

源代码1 项目： HeaderFooterRecyclerView 文件： OnRecyclerViewScrollListener.java

/**
 * 计算第一个元素的位置
 */
private int calculateFirstVisibleItemPos(RecyclerView.LayoutManager layoutManager, int firstVisibleItemPosition) {
    switch (mLayoutManagerType) {
        case LINEAR:
            mLastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            firstVisibleItemPosition = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
            break;
        case GRID:
            mLastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
            firstVisibleItemPosition = ((GridLayoutManager) layoutManager).findFirstVisibleItemPosition();
            break;
        case STAGGERED_GRID:
            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
            if (mLastPositions == null) {
                mLastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
            }
            mLastPositions = staggeredGridLayoutManager.findLastVisibleItemPositions(mLastPositions);
            mLastVisibleItemPosition = findMax(mLastPositions);
            staggeredGridLayoutManager.findFirstCompletelyVisibleItemPositions(mLastPositions);
            firstVisibleItemPosition = findMax(mLastPositions);
            break;
    }
    return firstVisibleItemPosition;
}

源代码2 项目： VideoMeeting 文件： ViewUtils.java

public static int getLastVisiblePosition(RecyclerView recyclerView) {
	RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
	int position;
       if (manager instanceof GridLayoutManager) {
           position = ((GridLayoutManager) manager).findLastVisibleItemPosition();
       } else if (manager instanceof LinearLayoutManager) {
           position = ((LinearLayoutManager) manager).findLastVisibleItemPosition();
       } else if (manager instanceof StaggeredGridLayoutManager) {
           StaggeredGridLayoutManager layoutManager = (StaggeredGridLayoutManager) manager;
           int[] lastPositions = layoutManager.findLastVisibleItemPositions(new int[layoutManager.getSpanCount()]);
           position = getMaxPosition(lastPositions);
       } else {
           position = manager.getItemCount() - 1;
       }
       return position;
}

源代码3 项目： TigerVideo 文件： CommonRecyclerView.java

/**
 * 获取最后一条展示的位置
 *
 * @return
 */
public int getLastVisiblePosition() {

    int position;
    if (getLayoutManager() instanceof LinearLayoutManager) {
        position = ((LinearLayoutManager) getLayoutManager()).findLastVisibleItemPosition();
    } else if (getLayoutManager() instanceof GridLayoutManager) {
        position = ((GridLayoutManager) getLayoutManager()).findLastVisibleItemPosition();
    } else if (getLayoutManager() instanceof StaggeredGridLayoutManager) {
        StaggeredGridLayoutManager layoutManager = (StaggeredGridLayoutManager) getLayoutManager();
        int[] lastPositions = layoutManager.findLastVisibleItemPositions(new int[layoutManager.getSpanCount()]);
        position = getMaxPosition(lastPositions);
    } else {
        position = getLayoutManager().getItemCount() - 1;
    }
    return position;
}

源代码4 项目： LoadMoreRecyclerView 文件： LoadMoreRecyclerView.java

/**
 * 获取最后一条展示的位置
 *
 * @return
 */
private int getLastVisiblePosition() {
    int position;
    if (getLayoutManager() instanceof LinearLayoutManager) {
        position = ((LinearLayoutManager) getLayoutManager()).findLastVisibleItemPosition();
    } else if (getLayoutManager() instanceof GridLayoutManager) {
        position = ((GridLayoutManager) getLayoutManager()).findLastVisibleItemPosition();
    } else if (getLayoutManager() instanceof StaggeredGridLayoutManager) {
        StaggeredGridLayoutManager layoutManager = (StaggeredGridLayoutManager) getLayoutManager();
        int[] lastPositions = layoutManager.findLastVisibleItemPositions(new int[layoutManager.getSpanCount()]);
        position = getMaxPosition(lastPositions);
    } else {
        position = getLayoutManager().getItemCount() - 1;
    }
    return position;
}

源代码5 项目： Pas 文件： DRecyclerViewScrollListener.java

@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 = LayoutManagerType.LinearLayout;
        } else if (layoutManager instanceof GridLayoutManager) {
            layoutManagerType = LayoutManagerType.GridLayout;
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            layoutManagerType = LayoutManagerType.StaggeredGridLayout;
        } else {
            throw new RuntimeException(
                    "Unsupported LayoutManager used. Valid ones are LinearLayoutManager, GridLayoutManager and StaggeredGridLayoutManager");
        }
    }

    switch (layoutManagerType) {
        case LinearLayout:
            lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case GridLayout:
            lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case StaggeredGridLayout:
            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
            if (lastPositions == null) {
                lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
            }
            staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
            lastVisibleItemPosition = findMax(lastPositions);
            break;
    }


}

源代码6 项目： ARecyclerView 文件： XRecyclerView.java

private int getFirstVisibleItemPosition(RecyclerView.LayoutManager layoutManager) {
    int firstVisibleItemPosition = -1;
    if (layoutManagerType == null) {
        if (layoutManager instanceof LinearLayoutManager) {
            layoutManagerType = LayoutManagerType.LINEAR;
        } else if (layoutManager instanceof GridLayoutManager) {
            layoutManagerType = LayoutManagerType.GRID;
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            layoutManagerType = LayoutManagerType.STAGGERED_GRID;
        } else {
            throw new RuntimeException("Unsupported LayoutManager used. Valid ones are LinearLayoutManager, GridLayoutManager and StaggeredGridLayoutManager");
        }
    }

    switch (layoutManagerType) {
        case LINEAR:
            firstVisibleItemPosition = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
            break;
        case GRID:
            firstVisibleItemPosition = ((GridLayoutManager) layoutManager).findFirstVisibleItemPosition();
            break;
        case STAGGERED_GRID:
            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
            if (lastScrollPositions == null)
                lastScrollPositions = new int[staggeredGridLayoutManager.getSpanCount()];

            staggeredGridLayoutManager.findLastVisibleItemPositions(firstScrollPositions);
            firstVisibleItemPosition = findMin(firstScrollPositions);
            break;
    }
    return firstVisibleItemPosition;
}

源代码7 项目： HeaderAndFooterRecyclerView 文件： EndlessRecyclerOnScrollListener.java

@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 GridLayoutManager) {
            layoutManagerType = LayoutManagerType.GridLayout;
        } else if (layoutManager instanceof LinearLayoutManager) {
            layoutManagerType = LayoutManagerType.LinearLayout;
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            layoutManagerType = LayoutManagerType.StaggeredGridLayout;
        } else {
            throw new RuntimeException(
                    "Unsupported LayoutManager used. Valid ones are LinearLayoutManager, GridLayoutManager and StaggeredGridLayoutManager");
        }
    }

    switch (layoutManagerType) {
        case LinearLayout:
            lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case GridLayout:
            lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case StaggeredGridLayout:
            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
            if (lastPositions == null) {
                lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
            }
            staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
            lastVisibleItemPosition = findMax(lastPositions);
            break;
    }
}

源代码8 项目： RecyclerViewDemo 文件： BasePullUpRecyclerAdapter.java

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);
    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
    if (layoutManager instanceof LinearLayoutManager) {
        layoutManagerType = LINEAR;
    } else if (layoutManager instanceof GridLayoutManager) {
        layoutManagerType = GRID;
    } else if (layoutManager instanceof StaggeredGridLayoutManager) {
        layoutManagerType = STAGGERED_GRID;
    } else {
        throw new RuntimeException(
                "Unsupported LayoutManager used. Valid ones are " +
                        "LinearLayoutManager, GridLayoutManager and " +
                        "StaggeredGridLayoutManager");
    }

    switch (layoutManagerType) {
        case LINEAR:
            lastVisibleItem = ((LinearLayoutManager) layoutManager)
                    .findLastVisibleItemPosition();
            break;
        case GRID:
            lastVisibleItem = ((GridLayoutManager) layoutManager)
                    .findLastVisibleItemPosition();
            break;
        case STAGGERED_GRID:
            StaggeredGridLayoutManager staggeredGridLayoutManager
                    = (StaggeredGridLayoutManager) layoutManager;
            lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
            staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
            lastVisibleItem = findMax(lastPositions);
            break;
    }
}

源代码9 项目： HeaderFooterRecyclerView 文件： EndlessRecyclerOnScrollListener.java

@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 = LayoutManagerType.LinearLayout;
        } else if (layoutManager instanceof GridLayoutManager) {
            layoutManagerType = LayoutManagerType.GridLayout;
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            layoutManagerType = LayoutManagerType.StaggeredGridLayout;
        } else {
            throw new RuntimeException(
                    "Unsupported LayoutManager used. Valid ones are LinearLayoutManager, GridLayoutManager and StaggeredGridLayoutManager");
        }
    }

    switch (layoutManagerType) {
        case LinearLayout:
            lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case GridLayout:
            lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case StaggeredGridLayout:
            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
            if (lastPositions == null) {
                lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
            }
            staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
            lastVisibleItemPosition = findMax(lastPositions);
            break;
    }
}

源代码10 项目： CoreModule 文件： BasePullUpRecyclerAdapter.java

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);
    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
    if (layoutManager instanceof LinearLayoutManager) {
        layoutManagerType = LINEAR;
    } else if (layoutManager instanceof GridLayoutManager) {
        layoutManagerType = GRID;
    } else if (layoutManager instanceof StaggeredGridLayoutManager) {
        layoutManagerType = STAGGERED_GRID;
    } else {
        throw new RuntimeException(
                "Unsupported LayoutManager used. Valid ones are " +
                        "LinearLayoutManager, GridLayoutManager and " +
                        "StaggeredGridLayoutManager");
    }

    switch (layoutManagerType) {
        case LINEAR:
            lastVisibleItem = ((LinearLayoutManager) layoutManager)
                    .findLastVisibleItemPosition();
            break;
        case GRID:
            lastVisibleItem = ((GridLayoutManager) layoutManager)
                    .findLastVisibleItemPosition();
            break;
        case STAGGERED_GRID:
            StaggeredGridLayoutManager staggeredGridLayoutManager
                    = (StaggeredGridLayoutManager) layoutManager;
            lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
            staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
            lastVisibleItem = findMax(lastPositions);
            break;
    }
}

源代码11 项目： photosearcher 文件： EndlessScrollListener.java

public boolean shouldLoadNext(@NonNull StaggeredGridLayoutManager manager) {
    int lastItemPosition = manager.getItemCount() - 1;
    int[] lastVisibleItemPositions = manager.findLastVisibleItemPositions(null);

    if (lastVisibleItemPositions.length == 0) {
        return true;
    }

    int lastVisibleItemPosition = lastVisibleItemPositions[lastVisibleItemPositions.length - 1];

    return (lastItemPosition < lastVisibleItemPosition + getLoadingTriggerOffsetSize());
}

源代码12 项目： EasyRefreshLayout 文件： EasyRefreshLayout.java

/**
 * 最后一个的位置
 */
private int getLastVisiBleItem() {
    RecyclerView.LayoutManager layoutManager = mRecyclerView.getLayoutManager();
    int lastVisibleItemPosition = -1;

    int layoutManagerType = 0;
    if (layoutManager instanceof GridLayoutManager) {
        layoutManagerType = 1;
    } else if (layoutManager instanceof LinearLayoutManager) {
        layoutManagerType = 0;
    } else if (layoutManager instanceof StaggeredGridLayoutManager) {
        layoutManagerType = 2;
    } else {
        throw new RuntimeException(
                "Unsupported LayoutManager used. Valid ones are LinearLayoutManager, GridLayoutManager and StaggeredGridLayoutManager");
    }

    switch (layoutManagerType) {
        case 0:
            lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case 1:
            lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case 2:
            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
            int[] lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
            staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
            lastVisibleItemPosition = findMax(lastPositions);
            break;
    }
    return lastVisibleItemPosition;
}

源代码13 项目： CoordinatorLayoutExample 文件： EndlessRecyclerOnScrollListener.java

@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 = LayoutManagerType.LinearLayout;
        } else if (layoutManager instanceof GridLayoutManager) {
            layoutManagerType = LayoutManagerType.GridLayout;
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            layoutManagerType = LayoutManagerType.StaggeredGridLayout;
        } else {
            throw new RuntimeException(
                    "Unsupported LayoutManager used. Valid ones are LinearLayoutManager, GridLayoutManager and StaggeredGridLayoutManager");
        }
    }

    switch (layoutManagerType) {
        case LinearLayout:
            lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case GridLayout:
            lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case StaggeredGridLayout:
            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
            if (lastPositions == null) {
                lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
            }
            staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
            lastVisibleItemPosition = findMax(lastPositions);
            break;
    }

}

源代码14 项目： ZhiHu-TopAnswer 文件： LoadMoreRecyclerView.java

@Override
public void onScrolled(int dx, int dy) {
    super.onScrolled(dx, dy);

    LayoutManager layoutManager = getLayoutManager(); //拿到layoutmanager用来判断类型，拿到最后一个可见的view
    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(
                    "不支持的LayoutManager ,目前只支持 LinearLayoutManager, GridLayoutManager and StaggeredGridLayoutManager");
        }
    }
    /**
     * 拿到最后一个可见的view
     */
    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;
    }
}

源代码15 项目： RecyclerViewAdapter 文件： OnRVLoadMoreScrollListener.java

@Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);

        RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
        //  int lastVisibleItemPosition = -1;
        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;
        }
//        if (!recyclerView.canScrollVertically(-1)) {
//            onScrolledToTop();
//        } else if (!recyclerView.canScrollVertically(1)) {
//            onScrolledToBottom();
//        } else if (dy < 0) {
//            onScrolledUp();
//        } else if (dy > 0) {
//            onScrolledDown();
//        }


    }

源代码16 项目： Social 文件： RecyclerViewScrollListener.java

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

    Log.d(TAG, "onScrolled: dy = " + dy);

    /**
     * 获取布局参数
     */
    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();

    //如果为null，第一次运行，确定布局类型
    if (mLayoutManagerType == null) {
        if (layoutManager instanceof LinearLayoutManager) {
            mLayoutManagerType = LayoutManagerType.LINEAR_LAYOUT;
        } else if (layoutManager instanceof GridLayoutManager) {
            mLayoutManagerType = LayoutManagerType.GRID_LAYOUT;
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            mLayoutManagerType = LayoutManagerType.STAGGERED_GRID_LAYOUT;
        } else {
            throw new RuntimeException("LayoutManager should be LinearLayoutManager,GridLayoutManager,StaggeredGridLayoutManager");
        }
    }

    //对于不太能够的布局参数，不同的方法获取到当前显示的最后一个条目数
    switch (mLayoutManagerType) {
        case LINEAR_LAYOUT:
            mLastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case GRID_LAYOUT:
            mLastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
            int firstItemPosition = ((GridLayoutManager) layoutManager).findFirstVisibleItemPosition();
            Log.d(TAG, "onScrolled: firstPosition = " + firstItemPosition);
            break;
        case STAGGERED_GRID_LAYOUT:
            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
            if (mLastPostions == null) {
                mLastPostions = new int[staggeredGridLayoutManager.getSpanCount()];
            }
            staggeredGridLayoutManager.findLastVisibleItemPositions(mLastPostions);
            mLastVisibleItemPosition = findMax(mLastPostions);
            break;
        default:
            break;
    }

}

源代码17 项目： weex-uikit 文件： WXRecyclerViewOnScrollListener.java

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
  super.onScrolled(recyclerView, dx, dy);
  RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
  listener.get().onBeforeScroll(dx,dy);
  //  int lastVisibleItemPosition = -1;
  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();
      listener.get().notifyAppearStateChange(((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition()
          ,lastVisibleItemPosition
          ,dx
          ,dy);
      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;
  }
}

源代码18 项目： LRecyclerView 文件： LuRecyclerView.java

@Override
public void onScrolled(int dx, int dy) {
    super.onScrolled(dx, dy);

    int firstVisibleItemPosition = 0;
    RecyclerView.LayoutManager layoutManager = getLayoutManager();

    if (layoutManagerType == null) {
        if (layoutManager instanceof LinearLayoutManager) {
            layoutManagerType = LayoutManagerType.LinearLayout;
        } else if (layoutManager instanceof GridLayoutManager) {
            layoutManagerType = LayoutManagerType.GridLayout;
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            layoutManagerType = LayoutManagerType.StaggeredGridLayout;
        } else {
            throw new RuntimeException(
                    "Unsupported LayoutManager used. Valid ones are LinearLayoutManager, GridLayoutManager and StaggeredGridLayoutManager");
        }
    }

    switch (layoutManagerType) {
        case LinearLayout:
            firstVisibleItemPosition = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
            lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case GridLayout:
            firstVisibleItemPosition = ((GridLayoutManager) layoutManager).findFirstVisibleItemPosition();
            lastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case StaggeredGridLayout:
            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
            if (lastPositions == null) {
                lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
            }
            staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
            lastVisibleItemPosition = findMax(lastPositions);
            staggeredGridLayoutManager.findFirstCompletelyVisibleItemPositions(lastPositions);
            firstVisibleItemPosition = findMax(lastPositions);
            break;
        default:
            break;
    }

    // 根据类型来计算出第一个可见的item的位置，由此判断是否触发到底部的监听器
    // 计算并判断当前是向上滑动还是向下滑动
    calculateScrollUpOrDown(firstVisibleItemPosition, dy);
    // 移动距离超过一定的范围，我们监听就没有啥实际的意义了
    mScrolledXDistance += dx;
    mScrolledYDistance += dy;
    mScrolledXDistance = (mScrolledXDistance < 0) ? 0 : mScrolledXDistance;
    mScrolledYDistance = (mScrolledYDistance < 0) ? 0 : mScrolledYDistance;
    if (mIsScrollDown && (dy == 0)) {
        mScrolledYDistance = 0;
    }
    //Be careful in here
    if (null != mLScrollListener) {
        mLScrollListener.onScrolled(mScrolledXDistance, mScrolledYDistance);
    }

    //如果想要滑动到底部自动加载更多，mIsManualLoadMore必须为false
    if (mIsManualLoadMore) {
        if (!isNoMore) {
            Log.e("lzx","onScrooo set visible");
            mLoadingData = true;
            mLoadMoreFooter.setOnClickLoadMoreListener(mLoadMoreListener);
        }

    } else {
        if (mLoadMoreListener != null && mLoadMoreEnabled) {
            int visibleItemCount = layoutManager.getChildCount();
            int totalItemCount = layoutManager.getItemCount();
            if (visibleItemCount > 0
                    && lastVisibleItemPosition >= totalItemCount - 1
                    && (isCritical ? totalItemCount >= visibleItemCount : totalItemCount > visibleItemCount)
                    && !isNoMore
                    && !mRefreshing) {

                mFootView.setVisibility(View.VISIBLE);
                if (!mLoadingData) {
                    mLoadingData = true;
                    mLoadMoreFooter.onLoading();
                    mLoadMoreListener.onLoadMore();
                }

            }

        }
    }

}

源代码19 项目： GankMeizhi 文件： RecyclerViewLoadHelper.java

public static boolean isToBottom(RecyclerView recyclerView) {
    int lastVisibleItemPosition = -1;
    int[] lastPositions;
    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
    if (null != layoutManager) {
        LAYOUT_MANAGER_TYPE layoutManagerType;
        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 ClassCastException(
                    "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;
                lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
                staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
                lastVisibleItemPosition = findMax(lastPositions);

                break;
        }

        int visibleItemCount = layoutManager.getChildCount();
        int totalItemCount = layoutManager.getItemCount();
        if ((visibleItemCount > 0 && (lastVisibleItemPosition) >= totalItemCount - 1)) {
            //到达最后
            return true;
        }

    }
    return false;
}

源代码20 项目： weex 文件： WXRecyclerViewOnScrollListener.java

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
  super.onScrolled(recyclerView, dx, dy);
  RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
  //  int lastVisibleItemPosition = -1;
  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();
      listener.get().notifyAppearStateChange(((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition()
          ,lastVisibleItemPosition
          ,dx
          ,dy);
      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;
  }
}

方法所在类

android.support.v7.widget.StaggeredGridLayoutManager