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不用說，我遇到了很多針對此特定問題的建議解決方案。我刪除scrollListener並在我的片段內部實現它，我使用notifyItemRangeInserted而不是notifyDataSetChanged。問題是，這些解決方案都沒有爲我工作......我在我的應用程序中顯示了一組youtube視頻。我的數據集確實更新了;事情是，當我向下滾動，在某些點上滾動位置移動到頂部，即我的數據集在這裏的第一個項目是我的活動的一個片段：滾動時在recyclerview中更新數據集將滾動發送到頂部
private void setUpRecyclerView()
{
mRecyclerView.setHasFixedSize(true);
linearLayoutManager = new LinearLayoutManager(getActivity());
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(linearLayoutManager);
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
totalItemCount = linearLayoutManager.getItemCount();
lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
if (!loading && totalItemCount <= (lastVisibleItem + visibleThreshold))
{
loadMorePosts();
loading = true;
}
}
});
initAdapter();
}
private void initAdapter()
{
adapter = new MyAdapter(mDataSet, getActivity());
mRecyclerView.setAdapter(adapter);
skeletonScreen = Skeleton.bind(mRecyclerView)
.adapter(adapter)
.shimmer(true)
.angle(30)
.duration(1200)
.count(10)
.load(R.layout.youtube_item)
.show();
}
private void loadVideos(final OnLoadPlayListCallback videosCallback, String pageToken)
{
Call<FullChannelPlayListData> mcallPlayList = mYouTubeService.getPlayList(
Tags.VALUE_SNIPPET,
20,
mPlayListId,
getActivity().getResources().getString(R.string.youtube_data_api_key),
pageToken
);
mcallPlayList.enqueue(new Callback<FullChannelPlayListData>() {
@Override
public void onResponse(Call<FullChannelPlayListData> call, Response<FullChannelPlayListData> response) {
if (response.code() == 200)
{
Log.d("FullPlayListSuccessful", response.message());
videosCallback.onSuccessfulRequest(response.body());
}
else Log.d("FullPlayListUnsuccess", response.message());
}
@Override
public void onFailure(Call<FullChannelPlayListData> call, Throwable t) {
videosCallback.onFailureRequest(t);
}
});
}
@Override
public void onSuccessfulRequest(FullChannelPlayListData fullChannelPlayListData)
{
Log.d(TAG, "onSuccessfulRequest Item size = "+ fullChannelPlayListData.getItems().size());
if (StringUtils.isNotEmpty(mNextPageToken))
removeFooter();
for (FullPlayListItems mItem: fullChannelPlayListData.getItems())
{
FullPlayListItems randomItem = getVideoFromDataSet(mItem.getSnippet().getResourceId().getVideoId(), mDataSet);
if (randomItem == null) {
mDataSet.add(mItem);
}
}
adapter.notifyItemRangeInserted(adapter.getItemCount(), mDataSet.size());
mRecyclerView.postDelayed(new Runnable() {
@Override
public void run() {
skeletonScreen.hide();
}
}, 2000);
mNextPageToken = fullChannelPlayListData.getNextPageToken();
setLoaded();
}
public void setLoaded() {
loading = false;
}
我會用真的可以使用一些幫助...
UPDATE MyAdapter類
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
{
private List<FullPlayListItems> mDataSet;
private Context mActivity;
private static final int YOUTUBE_ITEM_VIEW_TYPE = 0;
private static final int PROGRESS_BAR_ITEM_VIEW_TYPE = 1;
public MyAdapter(List<FullPlayListItems> mDataSet, Context mActivity) {
this.mDataSet = mDataSet;
this.mActivity = mActivity;
}
public class ProgressViewHolder extends RecyclerView.ViewHolder
{
@BindView(R.id.pBarLoadMorePosts)
ProgressBar pBarLoadMore;
public ProgressViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
@Override
public int getItemViewType(int position) {
return mDataSet.get(position) != null ? YOUTUBE_ITEM_VIEW_TYPE : PROGRESS_BAR_ITEM_VIEW_TYPE;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
RecyclerView.ViewHolder viewHolder;
if (viewType == PROGRESS_BAR_ITEM_VIEW_TYPE)
{
View pBarLayoutView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.footer_loader, parent, false);
viewHolder = new ProgressViewHolder(pBarLayoutView);
}
else
{
View postItemLayoutView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.youtube_item, parent, false);
viewHolder = new YoutubeItemViewHolder(postItemLayoutView);
}
return viewHolder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
int viewType = getItemViewType(position);
FullPlayListItems mVideoItem = mDataSet.get(position);
switch (viewType)
{
case PROGRESS_BAR_ITEM_VIEW_TYPE:
ProgressViewHolder progressViewHolder = (ProgressViewHolder) holder;
progressViewHolder.pBarLoadMore.getIndeterminateDrawable().setColorFilter(CoreApplication.getRes().getColor(R.color.colorPrimary), PorterDuff.Mode.SRC_IN);
break;
case YOUTUBE_ITEM_VIEW_TYPE:
default:
YoutubeItemViewHolder youtubeItemViewHolder = (YoutubeItemViewHolder) holder;
youtubeItemViewHolder.mVideoTitle.setText(mVideoItem.getSnippet().getTitle());
youtubeItemViewHolder.sdvYoutubeThumbnail.setImageURI(Uri.parse(mVideoItem.getSnippet().getThumbnails().getHigh().getUrl()));
}
}
@Override
public int getItemCount() {
return mDataSet != null ? mDataSet.size() : 0;
}
public class YoutubeItemViewHolder extends RecyclerView.ViewHolder
{
TextView mVideoTitle;
SimpleDraweeView sdvYoutubeThumbnail;
public YoutubeItemViewHolder(View itemView)
{
super(itemView);
mVideoTitle = (TextView)itemView.findViewById(R.id.tv_video_title);
sdvYoutubeThumbnail = (SimpleDraweeView)itemView.findViewById(R.id.sdv_thumbnail);
}
}
}
這裏是我的onViewCreated：
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mPlayListId = getArguments().getString(Tags.YT_CHANNEL_PLAYLIST_ID);
setUpRecyclerView();
// Like I said initially mNextPageToken is empty
loadVideos(this, mNextPageToken);
}
如何在loadMorePost（） –
更新您的適配器的數據集它只是利用改造網絡的請求......如果一切順利，我只是因爲提供的回調爲成功request..So我適配器已經在onViewCreated中初始化，我只需要更新onSuccessfulRequest（）內的itemCount（） –
您可以請分享該代碼以供參考 –