我正在开发一个能够搜索用户以及餐厅的android应用。因此，我正在使用自定义适配器来处理两种类型的项目。我需要显示的对象是“用户”和“餐馆”。这些对象需要完全不同的布局才能显示它们。
这是我的SearchingFragment，其中包含适配器：
public class SearchingFragment extends Fragment {
private SearchView searchView;
private RecyclerView resultList;
private RecyclerView.Adapter<RecyclerView.ViewHolder> adapter;
final int VIEW_TYPE_USER = 0;
final int VIEW_TYPE_EATERIES = 1;
private ArrayList<User> userArrayList = new ArrayList<User>();
private ArrayList<Eateries2> eateriesArrayList = new ArrayList<Eateries2>();
FirebaseFirestore db = FirebaseFirestore.getInstance();
String TAG;
private OnItemClickListener mListener;
public interface OnItemClickListener {
void OnItemClick(int position);
}
public void setOnItemClickListener(OnItemClickListener listener) {
mListener = listener;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_searching, container, false);
//return inflater.inflate(R.layout.fragment_searching, container, false);
searchView = root.findViewById(R.id.searchView);
resultList = root.findViewById(R.id.resultList);
resultList.setHasFixedSize(true);
resultList.setLayoutManager(new LinearLayoutManager(getActivity()));
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
if(newText.trim().isEmpty()){
userArrayList = new ArrayList<>();
eateriesArrayList = new ArrayList<>();
}
else {
userArrayList = new ArrayList<>();
eateriesArrayList = new ArrayList<>();
FirestoreUserSearch(newText);
}
return false;
}
});
return root;
}
private void FirestoreUserSearch(String searchText) {
db.collection("users")
.orderBy("username")
.startAt(searchText)
.endAt(searchText + "\uf8ff")
.get()
.addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
@Override
public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
for(DocumentChange document :queryDocumentSnapshots.getDocumentChanges()){
userArrayList.add(document.getDocument().toObject(User.class));
adapter.notifyDataSetChanged();
}
}
});
db.collection("eateries")
.orderBy("placeName")
.startAt(searchText)
.endAt(searchText + "\uf8ff")
.get()
.addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
@Override
public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
for(DocumentChange doc : queryDocumentSnapshots.getDocumentChanges()){
String placeId = doc.getDocument().getString("placeID");
String placeName = doc.getDocument().getString("placeName");
List<String> category = (List<String>)doc.getDocument().get("category");
String address = doc.getDocument().getString("address");
Double rating = doc.getDocument().getDouble("rating");
Double price_level = doc.getDocument().getDouble("price_level");
Eateries2 eateries = new Eateries2(address, category, placeId, placeName, rating, price_level);
eateriesArrayList.add(eateries);
adapter.notifyDataSetChanged();
}
}
});
adapter = new RecyclerView.Adapter<RecyclerView.ViewHolder>() {
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view;
if (viewType==VIEW_TYPE_USER){
view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.user_list_layout,parent,false);
return new SearchingFragment.UserViewHolder(view);
}
if(viewType==VIEW_TYPE_EATERIES){
view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.eateries_list_layout,parent,false);
return new SearchingFragment.EateriesViewHolder(view,mListener);
}
return null;
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
if(holder instanceof SearchingFragment.UserViewHolder){
((SearchingFragment.UserViewHolder) holder).userName.setText(userArrayList.get(position).getUsername());
((SearchingFragment.UserViewHolder) holder).category.setText("User");
((SearchingFragment.UserViewHolder) holder).userImage.setImageURI(null);
if(userArrayList.get(position).getPhoto()!=null){
Uri uri=Uri.parse(userArrayList.get(position).getPhoto());
Glide.with(getContext()).load(uri).into(((SearchingFragment.UserViewHolder) holder).userImage);
}
}
if(holder instanceof SearchingFragment.EateriesViewHolder){
((SearchingFragment.EateriesViewHolder) holder).placeName.setText(eateriesArrayList.get(position-userArrayList.size()).getPlaceName());
((SearchingFragment.EateriesViewHolder) holder).category.setText("Eatery\n"+eateriesArrayList.get(position-userArrayList.size()).getCategory());
((SearchingFragment.EateriesViewHolder) holder).address.setText(Html.fromHtml(eateriesArrayList.get(position-userArrayList.size()).getAddress()));
((EateriesViewHolder) holder).ratingBar.setRating(Float.parseFloat(eateriesArrayList.get(position-userArrayList.size()).getRating().toString()));
((EateriesViewHolder) holder).ratingBar.setIsIndicator(true);
((EateriesViewHolder) holder).priceRateBar.setRating(Float.parseFloat(eateriesArrayList.get(position-userArrayList.size()).getPrice_level().toString()));
List<Place.Field> fields = Arrays.asList(Place.Field.PHOTO_METADATAS);
FetchPlaceRequest placeRequest = FetchPlaceRequest.newInstance(eateriesArrayList.get(position-userArrayList.size()).getPlaceID(), fields);
String api = "AIzaSyDz5BGny6Lsp7gW-uJznoLVZS4riEdfnF0";
Places.initialize(getContext(), api);
PlacesClient placesClient = Places.createClient(getContext());
placesClient.fetchPlace(placeRequest).addOnSuccessListener((response) -> {
Place place = response.getPlace();
PhotoMetadata photoMetadata = place.getPhotoMetadatas().get(0);
String attributions = photoMetadata.getAttributions();
FetchPhotoRequest photoRequest = FetchPhotoRequest.builder(photoMetadata)
.build();
placesClient.fetchPhoto(photoRequest).addOnSuccessListener((fetchPhotoResponse) -> {
Bitmap bitmap = fetchPhotoResponse.getBitmap();
((SearchingFragment.EateriesViewHolder) holder).eateryImage.setImageBitmap(bitmap);
// imageView.setImageBitmap(bitmap);
}).addOnFailureListener((exception) -> {
if (exception instanceof ApiException) {
ApiException apiException = (ApiException) exception;
int statusCode = apiException.getStatusCode();
// Handle error with given status code.
Log.e(TAG, "Place not found: " + exception.getMessage());
}
});
});
}
}
@Override
public int getItemCount() {
return userArrayList.size()+eateriesArrayList.size();
}
@Override
public int getItemViewType(int position){
if(position<userArrayList.size()){
return VIEW_TYPE_USER;
}
if(position-userArrayList.size()<eateriesArrayList.size()){
return VIEW_TYPE_EATERIES;
}
return -1;
}
};
resultList.setAdapter(adapter);
}
private class UserViewHolder extends RecyclerView.ViewHolder {
TextView userName;
ImageView userImage;
TextView category;
UserViewHolder(View itemView) {
super(itemView);
userName = itemView.findViewById(R.id.userName);
userImage = itemView.findViewById(R.id.userImage);
category = itemView.findViewById(R.id.catagory);
}
}
private class EateriesViewHolder extends RecyclerView.ViewHolder{
TextView placeName;
TextView category;
TextView address;
ImageView eateryImage;
RatingBar ratingBar,priceRateBar;
EateriesViewHolder(View itemView,OnItemClickListener listener){
super(itemView);
placeName = itemView.findViewById(R.id.placeName);
category = itemView.findViewById(R.id.catagory);
address = itemView.findViewById(R.id.address);
eateryImage = itemView.findViewById(R.id.eateryImage);
ratingBar = itemView.findViewById(R.id.ratingBar);
priceRateBar = itemView.findViewById(R.id.priceRateBar);
}
}
那么，如何为适配器设置不同的OnClickListener？非常感谢。
答案 0 :(得分：1)
您可以将界面用于不同的点击监听器
您可以创建接口类
public interface ICallback {
public void onItemClick(int pos);
}
然后在适配器上调用接口类，然后单击项目单击
holder.textview.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
iCallback.onItemClick(position);
}
});
活动或片段中的最终调用接口类之后
iCallback = new ICallback() {
@Override
public void onItemClick(int pos) {
Intent intent = new Intent(HomeActivity.this,SecondActivity.class);
startActivity(intent);
}
};
答案 1 :(得分：0)
i：第一种方式
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if([this method is Override method]getItemViewType(position) == VIEW_TYPE_USER){
// here USER logic
}else{
// here EATERIES logic
}
}
});
II）第二种方式
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
if(holder instanceof SearchingFragment.UserViewHolder){
((SearchingFragment.UserViewHolder) holder).userName.setText(userArrayList.get(position).getUsername());
((SearchingFragment.UserViewHolder) holder).category.setText("User");
((SearchingFragment.UserViewHolder) holder).userImage.setImageURI(null);
if(userArrayList.get(position).getPhoto()!=null){
Uri uri=Uri.parse(userArrayList.get(position).getPhoto());
Glide.with(getContext()).load(uri).into(((SearchingFragment.UserViewHolder) holder).userImage);
}
((SearchingFragment.UserViewHolder) holder).itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
}
if(holder instanceof SearchingFragment.EateriesViewHolder){
((SearchingFragment.EateriesViewHolder) holder).placeName.setText(eateriesArrayList.get(position-userArrayList.size()).getPlaceName());
((SearchingFragment.EateriesViewHolder) holder).category.setText("Eatery\n"+eateriesArrayList.get(position-userArrayList.size()).getCategory());
((SearchingFragment.EateriesViewHolder) holder).address.setText(Html.fromHtml(eateriesArrayList.get(position-userArrayList.size()).getAddress()));
((EateriesViewHolder) holder).ratingBar.setRating(Float.parseFloat(eateriesArrayList.get(position-userArrayList.size()).getRating().toString()));
((EateriesViewHolder) holder).ratingBar.setIsIndicator(true);
((EateriesViewHolder) holder).priceRateBar.setRating(Float.parseFloat(eateriesArrayList.get(position-userArrayList.size()).getPrice_level().toString()));
List<Place.Field> fields = Arrays.asList(Place.Field.PHOTO_METADATAS);
FetchPlaceRequest placeRequest = FetchPlaceRequest.newInstance(eateriesArrayList.get(position-userArrayList.size()).getPlaceID(), fields);
String api = "AIzaSyDz5BGny6Lsp7gW-uJznoLVZS4riEdfnF0";
Places.initialize(getContext(), api);
PlacesClient placesClient = Places.createClient(getContext());
placesClient.fetchPlace(placeRequest).addOnSuccessListener((response) -> {
Place place = response.getPlace();
PhotoMetadata photoMetadata = place.getPhotoMetadatas().get(0);
String attributions = photoMetadata.getAttributions();
FetchPhotoRequest photoRequest = FetchPhotoRequest.builder(photoMetadata)
.build();
placesClient.fetchPhoto(photoRequest).addOnSuccessListener((fetchPhotoResponse) -> {
Bitmap bitmap = fetchPhotoResponse.getBitmap();
((SearchingFragment.EateriesViewHolder) holder).eateryImage.setImageBitmap(bitmap);
// imageView.setImageBitmap(bitmap);
}).addOnFailureListener((exception) -> {
if (exception instanceof ApiException) {
ApiException apiException = (ApiException) exception;
int statusCode = apiException.getStatusCode();
// Handle error with given status code.
Log.e(TAG, "Place not found: " + exception.getMessage());
}
});
});
((SearchingFragment.EateriesViewHolder) holder).itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
}
}
}
答案 2 :(得分：0)
按如下所示更新您的ViewHolders
private class UserViewHolder extends RecyclerView.ViewHolder {
TextView userName;
ImageView userImage;
TextView category;
UserViewHolder(View itemView) {
super(itemView);
userName = itemView.findViewById(R.id.userName);
userImage = itemView.findViewById(R.id.userImage);
category = itemView.findViewById(R.id.catagory);
// set Click Listener of whole item view or your desired view
itemView.setOnClickListener(view -> {
User user = userArrayList.get(getAdapterPosition());
// do whatever you want to
});
}
}
private class EateriesViewHolder extends RecyclerView.ViewHolder {
TextView placeName;
TextView category;
TextView address;
ImageView eateryImage;
RatingBar ratingBar, priceRateBar;
EateriesViewHolder(View itemView) {
super(itemView);
placeName = itemView.findViewById(R.id.placeName);
category = itemView.findViewById(R.id.catagory);
address = itemView.findViewById(R.id.address);
eateryImage = itemView.findViewById(R.id.eateryImage);
ratingBar = itemView.findViewById(R.id.ratingBar);
priceRateBar = itemView.findViewById(R.id.priceRateBar);
// set Click Listener of whole item view or your desired view
itemView.setOnClickListener(view -> {
Eateries2 Eateries2 = eateriesArrayList.get(getAdapterPosition());
// do whatever you want to
});
}
}