我正在开发一款移动电话，该移动电话使用Sticky Headers RecyclerView列出药品，并且我正在从Firebase firetore云数据库中获取这些物品（药品清单），但是它只带一个物品，而不是指定集合中的所有物品< / p>
这是我必须显示药物的片段中的密码
public class DawaFragment extends Fragment {
private RecyclerView dawaList;
private ArrayList<Dawa> dawaPostList;
FirebaseFirestore firebaseFirestore;
private DawaRecyclerAdapter adapter;
LinearLayoutManager layoutManager;
private DocumentSnapshot lastVisible;
private Boolean isFirstPageFirstLoad = true;
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK)
{
String group_character_clicked = data.getStringExtra("result");
int position = Common.findPositionWithName(group_character_clicked,dawaPostList);
dawaList.smoothScrollToPosition(position);
}
}
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
public View onCreateView(@NonNull LayoutInflater inflater, final ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_dawa, container, false);
dawaPostList = new ArrayList<>();
dawaList = view.findViewById(R.id.dawaList);
layoutManager = new LinearLayoutManagerWithSmoothScroller(getContext());
dawaList.setLayoutManager(layoutManager);
dawaList.addItemDecoration(new DividerItemDecoration(Objects.requireNonNull(getContext()),layoutManager.getOrientation()));
createMedicine();
adapter = new DawaRecyclerAdapter(getContext(), dawaPostList);
dawaList.setAdapter(adapter);
return view;
}
private void createMedicine() {
if(FirebaseAuth.getInstance().getCurrentUser() != null) {
firebaseFirestore = FirebaseFirestore.getInstance();
dawaList.addOnScrollListener(new RecyclerView.OnScrollListener() {
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
Boolean reachBottom = !recyclerView.canScrollVertically(1);
if (reachBottom)
{
loadMorePost();
}
}
});
Task<QuerySnapshot> firstQuery = firebaseFirestore.collection("Dawa").limit(30).get();
firstQuery.addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
@Override
public void onSuccess(QuerySnapshot documentSnapshots) {
if (documentSnapshots != null) {
if (!documentSnapshots.isEmpty()) {
if (isFirstPageFirstLoad) {
lastVisible = documentSnapshots.getDocuments().get(documentSnapshots.size() - 1);
dawaPostList.clear();
}
for (DocumentChange doc : documentSnapshots.getDocumentChanges()) {
if (doc.getType() == DocumentChange.Type.ADDED) {
String blogPostId = doc.getDocument().getId();
Dawa blogPost = doc.getDocument().toObject(Dawa.class).withId(blogPostId);
if (isFirstPageFirstLoad) {
dawaPostList.add(blogPost);
dawaPostList = Common.sortList(dawaPostList);
dawaPostList = Common.addAlphabets(dawaPostList);
} else {
dawaPostList.add(0, blogPost);
dawaPostList = Common.sortList(dawaPostList);
dawaPostList = Common.addAlphabets(dawaPostList);
}
adapter.notifyDataSetChanged();
}
}
isFirstPageFirstLoad = false;
}
}
}
});
}
}
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
private void loadMorePost() {
Task<QuerySnapshot> nextQuery = firebaseFirestore.collection("Dawa").startAfter(lastVisible)
.limit(30).get();
nextQuery.addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
@Override
public void onSuccess(QuerySnapshot documentSnapshots) {
if(documentSnapshots != null) {
if (!documentSnapshots.isEmpty()) {
lastVisible = documentSnapshots.getDocuments().get(documentSnapshots.size() - 1);
for (DocumentChange doc : documentSnapshots.getDocumentChanges()) {
if (doc.getType() == DocumentChange.Type.ADDED) {
String blogPostId = doc.getDocument().getId();
Dawa blogPost = doc.getDocument().toObject(Dawa.class).withId(blogPostId);
dawaPostList.add(blogPost);
dawaPostList = Common.sortList(dawaPostList);
dawaPostList = Common.addAlphabets(dawaPostList);
adapter.notifyDataSetChanged();
}
}
}
}
}
});
}
}
以下是我的适配器的代码
public class DawaRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<Dawa> dawa_list;
public Context context;
public DawaRecyclerAdapter(Context context, List<Dawa> dawa_list) {
this.context = context;
this.dawa_list = dawa_list;
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
//View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.dawa_item_layout, parent, false);
if(viewType == VIEWTYPE_GROUP)
{
ViewGroup group = (ViewGroup)inflater.inflate(R.layout.group_layout,viewGroup,false);
return new GroupViewHolder(group);
}
else if(viewType == VIEWTYPE_PERSON)
{
ViewGroup group = (ViewGroup)inflater.inflate(R.layout.dawa_layout,viewGroup,false);
return new PersonViewHolder(group);
}
else
{
ViewGroup group = (ViewGroup)inflater.inflate(R.layout.group_layout,viewGroup,false);
return new GroupViewHolder(group);
}
}
@Override
public int getItemViewType(int position) {
return dawa_list.get(position).getViewType();
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, @SuppressLint("RecyclerView") final int position) {
if (viewHolder instanceof GroupViewHolder)
{
GroupViewHolder groupViewHolder = (GroupViewHolder) viewHolder;
groupViewHolder.textGroup.setText(dawa_list.get(position).getName());
groupViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//start action to display al alphabets
((Activity)context).startActivityForResult(new Intent(context, AlphabetActivity.class), RESULT_CODE);
}
});
}
else if (viewHolder instanceof PersonViewHolder)
{
final PersonViewHolder personViewHolder = (PersonViewHolder) viewHolder;
personViewHolder.dawaName.setText(dawa_list.get(position).getName());
//Get Avatar
ColorGenerator generator = ColorGenerator.MATERIAL;
TextDrawable drawable = TextDrawable.builder().buildRound(String.valueOf(dawa_list.get(position).getName()
.charAt(0)),generator.getRandomColor());
personViewHolder.dawaAvatar.setImageDrawable(drawable);
personViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent commentIntent = new Intent(context, DawaDescsActivity.class);
Bundle extras = new Bundle();
extras.putString("article", dawa_list.get(position).getDescs());
extras.putString("title", dawa_list.get(position).getName());
commentIntent.putExtras(extras);
context.startActivity(commentIntent); }
});
}
}
@Override
public int getItemCount() {
return dawa_list.size();
}
private class GroupViewHolder extends RecyclerView.ViewHolder{
private TextView textGroup;
public GroupViewHolder(@NonNull View itemView) {
super(itemView);
textGroup = itemView.findViewById(R.id.textGroup);
}
}
private class PersonViewHolder extends RecyclerView.ViewHolder{
private TextView dawaName;
private ImageView dawaAvatar;
public PersonViewHolder(View itemView) {
super(itemView);
dawaName = itemView.findViewById(R.id.dawa_name);
dawaAvatar = itemView.findViewById(R.id.dawa_avatar);
}
}
}