我正在使用RecyclerView和StaggeredGridLayoutManager以及无尽滚动。当列表的最后一项对用户可见时,我想进行网络调用。所以这里是我的代码:Recyclerview StaggeredGridLayoutManager - 查找最后一个可见项
public RecyclerViewAdapter(Context context) {
Log.d(Const.DEBUG, "RecyclerViewAdapter Constructor()");
this.context = context;
final StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) recyclerView.getLayoutManager();
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
totalItemCount = staggeredGridLayoutManager.getItemCount();
lastVisibleItems = staggeredGridLayoutManager.findLastVisibleItemPositions(new int[mStaggeredLayoutManager.getSpanCount()]);
Log.d(Const.DEBUG, "LastVisibleItems: " + Arrays.toString(lastVisibleItems));
Log.d(Const.DEBUG, "LastVisibleItems Count: " + lastVisibleItems.length);
if (staggeredGridLayoutManager.getSpanCount() == 1) {
lastVisibleItem = lastVisibleItems[0];
} else if (staggeredGridLayoutManager.getSpanCount() == 2) {
lastVisibleItem = Math.max(lastVisibleItems[0], lastVisibleItems[1]);
} else if (staggeredGridLayoutManager.getSpanCount() == 3) {
lastVisibleItem = Math.max(Math.max(lastVisibleItems[0], lastVisibleItems[1]), lastVisibleItems[2]);
}
if (!isRefreshing && (totalItemCount <= lastVisibleItem + visibleThreshold)) {
Log.d(Const.DEBUG, "isRefreshing: " + isRefreshing);
Log.d(Const.DEBUG, "totalItemCount: " + totalItemCount);
Log.d(Const.DEBUG, "lastVisibileItem: " + lastVisibleItem);
Log.d(Const.DEBUG, "visibileThreshold: " + visibleThreshold);
Log.d(Const.DEBUG, "calling LoadMore()");
if (mIOnLoadMoreListener != null) {
mIOnLoadMoreListener.onLoadMore();
}
isRefreshing = true;
}
}
});
}
我在第一次调用时从服务器获得9个值。所以,当我移动到最后一个索引[8]时,lastVisibleItem将为8,visibleThreshold为1,totalItemCount为9,因此下一次网络调用应该发生。现在实际发生的情况是,当屏幕第一次加载时,lastVisibleItem应该是1或2,但是它返回8,结果,loadMore()被调用。
的logcat:
D/xx: Items Count: 9
D/xx: LastVisibleItems: [8]
03-22 15:22:52.772 5957-5957/codsiga.com.xx D/xx: LastVisibleItems Count: 1
03-22 15:22:52.772 5957-5957/codsiga.com.xx D/xx: isRefreshing: false
03-22 15:22:52.772 5957-5957/codsiga.com.xx D/xx: totalItemCount: 9
03-22 15:22:52.772 5957-5957/codsiga.com.xx D/xx: lastVisibileItem: 8
03-22 15:22:52.772 5957-5957/codsiga.com.xx D/xx: visibileThershold: 1
03-22 15:22:52.772 5957-5957/codsiga.com.xx D/xx: calling LoadMore()
03-22 15:22:52.772 5957-5957/codsiga.com.xx D/xx: onLoadMore()
03-22 15:22:52.798 5957-5957/codsiga.com.xx D/xx: getDataFromServer()
什么是错在上面的代码?需要帮助请叫我。相同的代码之前运作良好。