我必须在recyclerView中添加分页。但是当我在recyclerView滚动时，我被困在添加进度条。
我一直在尝试一天但是unfortunately没有得到有效的解决方案来在recyclerView scrolling运行时添加进度条。我有三个ViewHolder。
RecyclerView Scroll Listener
rvRewardItems.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
int visibleItemCount = recyclerView.getChildCount();
int totalItemCount = wrapperLinearLayout.getItemCount();
int firstVisibleItem = wrapperLinearLayout.findFirstVisibleItemPosition();
int lastInScreen = firstVisibleItem + visibleItemCount;
if ((lastInScreen == totalItemCount) && !isLoadingMore) {
if (!mStopLoadingData) {
try {
isLoadingMore = true;
// Add item for progress ba
new Handler().post(new Runnable() {
@Override
public void run() {
adapter.addProgressView();
}
});
loadReviews(false, false);
}catch (IllegalStateException e){
e.printStackTrace();
}
}
}
}
});
RewardFinalAdapter.class
public class RewardFinalAdapter extends RecyclerView.Adapter<MainViewHolder>
{
private Context context;
private ArrayList<RewardItemBO> rewardArray;
private OnItemClickListener mItemClickListener;
public static final int VIEW_TYPE_PROGRESS = 0;
public static final int VIEW_TYPE_ITEM = 1;
public static final int VIEW_TYPE_HEADER = 2;
public RewardFinalAdapter(Context context, ArrayList<RewardItemBO> mainItems) {
this.context = context;
rewardArray = getFilterRewards(mainItems);
}
public void resetArray(ArrayList<RewardItemBO> latestArray)
{
rewardArray = getFilterRewards(latestArray);
}
public void setArrayItems(ArrayList<RewardItemBO> latestArray) {
rewardArray = latestArray;
}
@Override
public int getItemViewType(int position) {
if(rewardArray.get(position).isHeader())
return VIEW_TYPE_HEADER;
else if(rewardArray.get(position).isShowProgress())
return VIEW_TYPE_PROGRESS;
else
return VIEW_TYPE_ITEM;
}
@Override
public int getItemCount() {
return rewardArray.size();
}
public RewardItemBO getItem(int position) {
return rewardArray.get(position);
}
public void addItems( ArrayList<RewardItemBO> overallItem){
rewardArray = getFilterRewards(overallItem);
// notifyItemInserted(items.size() - 1);
this.notifyDataSetChanged();
}
// Create new views (invoked by the layout manager)
@Override
public MainViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
switch (viewType){
case VIEW_TYPE_HEADER:
View itemView = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.order_list_header, viewGroup, false);
return new RewardListViewHolderHeader(itemView);
case VIEW_TYPE_ITEM:
View view = LayoutInflater.from(context).inflate(R.layout.item_rewards, viewGroup, false);
return new RewardViewHolder(view);
case VIEW_TYPE_PROGRESS:
Log.v("view_type_progress","I am in VIEW_TYPE_PROGRESS");
View progressView = LayoutInflater.from(context).inflate(R.layout.progress_loader, viewGroup, false);
return new ProgressViewHolder(progressView);
}
return null;
}
// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(MainViewHolder viewHolder, int position) {
RewardItemBO rewardItemBO= rewardArray.get(position);
if(viewHolder instanceof RewardViewHolder)
{
RewardViewHolder rewardViewHolder=(RewardViewHolder) viewHolder;
rewardViewHolder.tvRewardTitle.setText(rewardArray.get(position).getRewardTitle());
rewardViewHolder.tvRewardDescription.setText(rewardArray.get(position).getRewardMessage());
String formatedDate = DateTimeOp.oneFormatToAnother(rewardArray.get(position).getRewardExpiryDate(), Constants.dateFormat18, Constants.dateFormat6);
rewardViewHolder.tvRewardExpiry.setText("Expires " + formatedDate);
if(rewardArray.get(position).getRewardShowRedeem().equals("1"))
{
rewardViewHolder.btnGrey.setVisibility(View.VISIBLE);
rewardViewHolder.btnGrey.setText("Redeemed");
}
else if(rewardArray.get(position).getRewardExpired().equals("1"))
{
rewardViewHolder.btnGrey.setVisibility(View.VISIBLE);
rewardViewHolder.btnGrey.setText("Expired");
}
else
{
rewardViewHolder.btnOrange.setVisibility(View.VISIBLE);
rewardViewHolder.btnOrange.setText("Get Code");
}
}
else if(viewHolder instanceof RewardListViewHolderHeader)
{
RewardListViewHolderHeader holder = (RewardListViewHolderHeader ) viewHolder;
holder.tvHeader.setText(rewardItemBO.getHeaderTitle());
}
else if(viewHolder instanceof ProgressViewHolder)
{
ProgressViewHolder progressViewHolder = (ProgressViewHolder) viewHolder;
progressViewHolder.progressBar.setIndeterminate(true);
}
}
public void addOnTop(ArrayList<RewardItemBO> topItemList) {
Collections.reverse(topItemList);
rewardArray.addAll(0, topItemList);
notifyItemRangeInserted(0, topItemList.size());
}
public interface OnItemClickListener {
public void onItemClick(View view , int position);
}
public void SetOnItemClickListener(final OnItemClickListener mItemClickListener) {
this.mItemClickListener = mItemClickListener;
}
@Override
public long getItemId(int position) {
return position;
}
public ArrayList<RewardItemBO> getFilterRewards(ArrayList<RewardItemBO> mainItems){
ArrayList<RewardItemBO> currentRewardList = new ArrayList<RewardItemBO>();
ArrayList<RewardItemBO> pastRewardList = new ArrayList<RewardItemBO>();
ArrayList<RewardItemBO> dummyArray = new ArrayList<>();
for (RewardItemBO rewardItemBO : mainItems) {
try {
//because reward item with progress have everything null in it.
if(rewardItemBO.getRewardExpired()!=null && !rewardItemBO.isShowProgress())
{
int isExpired = Integer.parseInt(rewardItemBO.getRewardExpired());
if(isExpired==1)
pastRewardList.add(rewardItemBO);
else
currentRewardList.add(rewardItemBO);
}
}catch (NumberFormatException e){
e.printStackTrace();
}
}
if(currentRewardList.size()>0){
currentRewardList.add(0, new RewardItemBO(context.getResources().getString(R.string.Current)));
dummyArray.addAll(currentRewardList);
}
if(pastRewardList.size()>0){
pastRewardList.add(0, new RewardItemBO(context.getResources().getString(R.string.Past)));
dummyArray.addAll(pastRewardList);
}
return dummyArray;
}
public void addProgressView()
{
rewardArray.add(new RewardItemBO(true));
//notifyItemChanged(rewardArray.size());
notifyDataSetChanged();
}
public void removeProgressView(){
int position = rewardArray.size() -1;
rewardArray.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, rewardArray.size());
}
public static class RewardListViewHolderHeader extends MainViewHolder {
protected TextView tvHeader;
public RewardListViewHolderHeader (View v) {
super(v);
tvHeader = (TextView) v.findViewById(R.id.header_text);
}
}
public class RewardViewHolder extends MainViewHolder implements View.OnClickListener{
public TextView tvRewardTitle;
public TextView tvRewardDescription;
public TextView tvRewardExpiry;
public Button btnOrange,btnGrey;
public RewardViewHolder(View v) {
super(v);
tvRewardTitle = (TextView) itemView.findViewById(R.id.tv_reward_title);
tvRewardDescription = (TextView) itemView.findViewById(R.id.tv_reward_description);
tvRewardExpiry = (TextView) itemView.findViewById(R.id.tv_reward_expiry_date);
btnOrange = (Button) itemView.findViewById(R.id.btn_item_reward_orange);
btnGrey = (Button) itemView.findViewById(R.id.btn_item_reward_grey);
btnOrange.setOnClickListener(this);
btnGrey.setOnClickListener(this);
}
@Override
public void onClick(View v) {
//Toast.makeText(context, tvName.getText().toString(), Toast.LENGTH_SHORT).show();
if (mItemClickListener != null) {
mItemClickListener.onItemClick(v,getAdapterPosition());
}
}
}
}