英文:
How to fix incompatible types: fragment cannot be converted to Context
问题
这是出现问题的那一行代码:
FirestoreList.setLayoutManager(new LinearLayoutManager(this));// this is the line that is giving me the error
要解决这个问题,你可以尝试将 this
更改为 requireContext()
,如下所示:
FirestoreList.setLayoutManager(new LinearLayoutManager(requireContext()));
这样应该可以解决你的错误。
英文:
i am trying to view items from my database and i have written everything to retrieve that and display it in an activity page. but this one line of code gives an error that doesn't allow the app to run:
here is my detailed code:
public class HomeFragment extends Fragment {
private String name;
private String location;
private String country;
private String address;
public HomeFragment() {
}
public HomeFragment(String name, String location, String country, String address) {
this.name = name;
this.location = location;
this.country = country;
this.address = address;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
private FirebaseFirestore firebaseFirestore;
private RecyclerView FirestoreList;
private FirestoreRecyclerAdapter adapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
firebaseFirestore = FirebaseFirestore.getInstance();
FirestoreList = FirestoreList.findViewById(R.id.firestore_list);
//query
Query q = firebaseFirestore.collection("Shops");
//recycle options
FirestoreRecyclerOptions<ShopModel> options = new FirestoreRecyclerOptions.Builder<ShopModel>().setQuery(q, ShopModel.class).build();
adapter = new FirestoreRecyclerAdapter<ShopModel, ShopViewHolder>(options) {
@NonNull
@Override
public ShopViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_home,parent,false);
return new ShopViewHolder(view);
}
@Override
protected void onBindViewHolder(@NonNull ShopViewHolder holder, int position, @NonNull ShopModel model) {
holder.list_name.setText(model.getName());
holder.list_country.setText(model.getName());
holder.list_location.setText(model.getName());
holder.list_address.setText(model.getName());
}
};
FirestoreList.setHasFixedSize(true);
FirestoreList.setLayoutManager(new LinearLayoutManager(this));// this is the line that is giving me the error
FirestoreList.setAdapter(adapter);
return inflater.inflate(R.layout.fragment_home, container, false);
}
private class ShopViewHolder extends RecyclerView.ViewHolder {
private TextView list_name;
private TextView list_country;
private TextView list_location;
private TextView list_address;
public ShopViewHolder(@NonNull View itemView) {
super(itemView);
list_name = itemView.findViewById(R.id.list_name);
list_country = itemView.findViewById(R.id.list_country);
list_location = itemView.findViewById(R.id.list_location);
list_address = itemView.findViewById(R.id.list_address);
}
}
@Override
public void onStart() {
super.onStart();
adapter.startListening();
}
@Override
public void onStop() {
super.onStop();
adapter.stopListening();
}
}
this is the line where there is a problem at
FirestoreList.setLayoutManager(new LinearLayoutManager(this));
// this is the line that is giving me the error
what can i do to resolve this?
答案1
得分: 2
你正在将你的片段传递给 LinearLayoutManager
,而不是 Context
。
所以你需要做的就是简单地替换这行代码
FirestoreList.setLayoutManager(new LinearLayoutManager(this));
为
FirestoreList.setLayoutManager(new LinearLayoutManager(requireContext()));
英文:
You are passing your fragment to LinearLayoutManager
, not the Context
So what you need to do is simply replace this line
FirestoreList.setLayoutManager(new LinearLayoutManager(this));
To
FirestoreList.setLayoutManager(new LinearLayoutManager(requireContext()));
答案2
得分: 0
请创建一个名为FirestoreList的对象,并尝试将布局管理器设置为该对象:
FirestoreList fsList = FirestoreList.findViewById(R.id.firestore_list);
...
fsList.setLayoutManager(new LinearLayoutManager(this));
英文:
Can you please make an object for FirestoreList and try to set the LayoutManager to the object ?
FirestoreList fsList = FirestoreList.findViewById(R.id.firestore_list);
...
fsList.setLayoutManager(new LinearLayoutManager(this));
答案3
得分: 0
将这个语句更改为:
View view = inflater.inflate(R.layout.fragment_home, container, false);
英文:
Change this statement :
return inflater.inflate(R.layout.fragment_home, container, false);
to:
View view = inflater.inflate(R.layout.fragment_home, container, false);
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