实现 on单击在 FirestoreRecyclerAdapter 中打开一个新的活动

Question

在我的应用程序中，我有一个回收器视图，其中包含来自Firestore数据库的元素。我想通过单击回收器视图中的元素(位于片段内(将该元素的数据传递给另一个活动。我已经尝试了几种解决方案，但似乎都没有奏效，我被卡住了。请帮助我。

适配器类

public class InfoElementAdapter extends FirestoreRecyclerAdapter<InfoElement, InfoElementAdapter.InfoElementHolder> {
String urlImg;
public InfoElementAdapter(@NonNull FirestoreRecyclerOptions<InfoElement> options) {
super(options);
}
@Override
protected void onBindViewHolder(@NonNull InfoElementHolder holder, int position, @NonNull InfoElement model) {
holder.textViewNomeRest.setText(model.getNome());
holder.textViewDescrRest.setText(model.getDescrizione());
urlImg = model.getUrlImg();
Glide.with(holder.itemView.getContext()).load(urlImg).into(holder.imageView);
}
@NonNull
@Override
public InfoElementHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_single, parent, false );
return new InfoElementHolder(v) ;
}
class InfoElementHolder extends RecyclerView.ViewHolder {
TextView textViewNomeRest;
TextView textViewDescrRest;
ImageView imageView;
public InfoElementHolder(@NonNull View itemView) {
super(itemView);
textViewNomeRest = itemView.findViewById(R.id.txt_v_nome);
textViewDescrRest = itemView.findViewById(R.id.txt_v_descrizione);
imageView = itemView.findViewById(R.id.imageV);
}
}

}

回收器片段视图

public class RestaurantFragment extends Fragment {
private FirebaseFirestore db = FirebaseFirestore.getInstance();
private CollectionReference restaurantRef = db.collection("restaurant_db");
private InfoElementAdapter adapter;
private View view;


@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_restaurant, container, false);
setUpRecyclerView();
return view;
}
private void setUpRecyclerView() {
Query query = restaurantRef.orderBy("nome", Query.Direction.ASCENDING);
FirestoreRecyclerOptions<InfoElement> options = new FirestoreRecyclerOptions.Builder<InfoElement>()
.setQuery(query, InfoElement.class)
.build();
adapter = new InfoElementAdapter(options);

RecyclerView recyclerView = view.findViewById(R.id.firestore_list1);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new StaggeredGridLayoutManager(Tools.getGridSpanCount(getActivity()), StaggeredGridLayoutManager.VERTICAL));
recyclerView.addItemDecoration(new Tools.SpacingItemDecoration(Tools.getGridSpanCount(getActivity()), Tools.dpToPx(getActivity(), 4),true));
recyclerView.setAdapter(adapter);
}
@Override
public void onStart() {
super.onStart();
adapter.startListening();
}
@Override
public void onStop() {
super.onStop();
if (adapter != null) {
adapter.stopListening();
}
}

}

信息元素类

public class InfoElement {
private String nome;
private String descrizione;
private String urlImg;
public InfoElement() {
}
public InfoElement(String nome, String descrizione, String urlImg) {
this.nome = nome;
this.descrizione = descrizione;
this.urlImg =  urlImg;
}
public void setNome(String nome) {
this.nome = nome;
}
public void setDescrizione(String descrizione) {
this.descrizione = descrizione;
}
public String getUrlImg() {
return urlImg;
}
public void setUrlImg(String urlImg) {
this.urlImg = urlImg;
}
public String getNome() {
return nome;
}
public String getDescrizione() {
return descrizione;
}

}

Answer 1

您可以通过为 ViewHolderitemView设置单击侦听器来更改onBindViewHolder，并使用putExtra添加数据对象，并在目标活动中getIntent().getSerializableExtra检索它。

@Override
protected void onBindViewHolder(@NonNull InfoElementHolder holder, int position, @NonNull InfoElement model) {
holder.textViewNomeRest.setText(model.getNome());
holder.textViewDescrRest.setText(model.getDescrizione());
urlImg = model.getUrlImg();
Glide.with(holder.itemView.getContext()).load(urlImg).into(holder.imageView);
holder.itemView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent (v.getContext(), ActivityB.class);
intent.putExtra("MyData", myData);
startActivity(intent);
}
});
}

检索目标活动中的数据

getIntent().getSerializableExtra("MyData");