Java 当导航回上一个片段时,数据正在复制
我在我的应用程序中使用导航组件我有两个片段一个片段项目列表,另一个显示项目的详细信息当用户单击片段1中的项目时,它会转到详细信息片段,当我切换回第一个片段时,所有列表再次重复 下面是我的代码: CakeFragment.javaJava 当导航回上一个片段时,数据正在复制,java,android,android-fragments,Java,Android,Android Fragments,我在我的应用程序中使用导航组件我有两个片段一个片段项目列表,另一个显示项目的详细信息当用户单击片段1中的项目时,它会转到详细信息片段,当我切换回第一个片段时,所有列表再次重复 下面是我的代码: CakeFragment.java public class CakeFragment extends Fragment { List<AllCakes> allCakeList = new ArrayList<>(); AllCakesAdapter adapter; Bott
public class CakeFragment extends Fragment {
List<AllCakes> allCakeList = new ArrayList<>();
AllCakesAdapter adapter;
BottomNavigationView navView;
FragmentCakeBinding fragmentCakeBinding;
public CakeFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
fragmentCakeBinding = FragmentCakeBinding.inflate(inflater,container,false);
navView = getActivity().findViewById(R.id.navView);
navView.setVisibility(View.GONE);
getAllCakes();
return fragmentCakeBinding.getRoot();
}
private void getAllCakes(){
Retrofit retrofit = RetrofitClient.getInstance();
ApiService apiService = retrofit.create(ApiService.class);
Call<List<AllCakes>> call = apiService.getAllCake();
call.enqueue(new Callback<List<AllCakes>>() {
@Override
public void onResponse(Call<List<AllCakes>> call, Response<List<AllCakes>> response) {
fragmentCakeBinding.cakeProgress.setVisibility(View.INVISIBLE);
fragmentCakeBinding.allCakeRecycler.setHasFixedSize(true);
fragmentCakeBinding.allCakeRecycler.setLayoutManager(new LinearLayoutManager(getActivity()));
allCakeList.addAll(response.body());
adapter = new AllCakesAdapter(getActivity(),allCakeList);
fragmentCakeBinding.allCakeRecycler.setAdapter(adapter);
}
@Override
public void onFailure(Call<List<AllCakes>> call, Throwable t) {
fragmentCakeBinding.cakeProgress.setVisibility(View.INVISIBLE);
TastyToast.makeText(getActivity(),t.getMessage(),TastyToast.LENGTH_SHORT,TastyToast.ERROR).show();
}
});
}
}
public class AllCakesAdapter extends RecyclerView.Adapter<AllCakesAdapter.ViewHolder> {
Context context;
List<AllCakes> allCakeList;
public AllCakesAdapter(Context context, List<AllCakes> allCakeList) {
this.context = context;
this.allCakeList = allCakeList;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.allcakes_row,parent,false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
AllCakes model = allCakeList.get(position);
Glide.with(context).load(model.getImgurl()).into(holder.allCakeImg);
holder.allCakeName.setText(model.getName());
holder.cakeDisPrice.setPaintFlags(holder.cakeDisPrice.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
holder.moreCake.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
NavController navController = Navigation.findNavController((Activity) context,R.id.fragment);
navController.navigate(R.id.cakeDetailFragment);
}
});
}
@Override
public int getItemCount() {
return allCakeList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView allCakeImg;
Button moreCake;
TextView allCakeName;
public ViewHolder(@NonNull View itemView) {
super(itemView);
allCakeImg = itemView.findViewById(R.id.allCakeImg);
moreCake = itemView.findViewById(R.id.moreCake);
allCakeName = itemView.findViewById(R.id.allCakeName);
}
}
}
public class CakeDetailFragment extends Fragment {
FragmentCakeDetailBinding fragmentCakeDetailBinding;
public CakeDetailFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
fragmentCakeDetailBinding = FragmentCakeDetailBinding.inflate(inflater,container,false);
return fragmentCakeDetailBinding.getRoot();
}
}
allCakeList.clear();
allCakeList.addAll(response.body());
//rest of the logic remains same
为什么会发生这种情况?试试下面的方法,看看是否能解决您的问题 CakeFragment.java
public class CakeFragment extends Fragment {
List<AllCakes> allCakeList = new ArrayList<>();
AllCakesAdapter adapter;
BottomNavigationView navView;
FragmentCakeBinding fragmentCakeBinding;
public CakeFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
fragmentCakeBinding = FragmentCakeBinding.inflate(inflater,container,false);
navView = getActivity().findViewById(R.id.navView);
navView.setVisibility(View.GONE);
getAllCakes();
return fragmentCakeBinding.getRoot();
}
private void getAllCakes(){
Retrofit retrofit = RetrofitClient.getInstance();
ApiService apiService = retrofit.create(ApiService.class);
Call<List<AllCakes>> call = apiService.getAllCake();
call.enqueue(new Callback<List<AllCakes>>() {
@Override
public void onResponse(Call<List<AllCakes>> call, Response<List<AllCakes>> response) {
fragmentCakeBinding.cakeProgress.setVisibility(View.INVISIBLE);
fragmentCakeBinding.allCakeRecycler.setHasFixedSize(true);
fragmentCakeBinding.allCakeRecycler.setLayoutManager(new LinearLayoutManager(getActivity()));
allCakeList.addAll(response.body());
adapter = new AllCakesAdapter(getActivity(),allCakeList);
fragmentCakeBinding.allCakeRecycler.setAdapter(adapter);
}
@Override
public void onFailure(Call<List<AllCakes>> call, Throwable t) {
fragmentCakeBinding.cakeProgress.setVisibility(View.INVISIBLE);
TastyToast.makeText(getActivity(),t.getMessage(),TastyToast.LENGTH_SHORT,TastyToast.ERROR).show();
}
});
}
}
public class AllCakesAdapter extends RecyclerView.Adapter<AllCakesAdapter.ViewHolder> {
Context context;
List<AllCakes> allCakeList;
public AllCakesAdapter(Context context, List<AllCakes> allCakeList) {
this.context = context;
this.allCakeList = allCakeList;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.allcakes_row,parent,false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
AllCakes model = allCakeList.get(position);
Glide.with(context).load(model.getImgurl()).into(holder.allCakeImg);
holder.allCakeName.setText(model.getName());
holder.cakeDisPrice.setPaintFlags(holder.cakeDisPrice.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
holder.moreCake.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
NavController navController = Navigation.findNavController((Activity) context,R.id.fragment);
navController.navigate(R.id.cakeDetailFragment);
}
});
}
@Override
public int getItemCount() {
return allCakeList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView allCakeImg;
Button moreCake;
TextView allCakeName;
public ViewHolder(@NonNull View itemView) {
super(itemView);
allCakeImg = itemView.findViewById(R.id.allCakeImg);
moreCake = itemView.findViewById(R.id.moreCake);
allCakeName = itemView.findViewById(R.id.allCakeName);
}
}
}
public class CakeDetailFragment extends Fragment {
FragmentCakeDetailBinding fragmentCakeDetailBinding;
public CakeDetailFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
fragmentCakeDetailBinding = FragmentCakeDetailBinding.inflate(inflater,container,false);
return fragmentCakeDetailBinding.getRoot();
}
}
allCakeList.clear();
allCakeList.addAll(response.body());
//rest of the logic remains same
你的电话是:
allCakeList.addAll(response.body())代码>
每次都没有把你的清单清理掉
您必须清除该列表:
allCakeList.clear();
allCakeList.addAll(response.body());
<>这是你可以通过在你的<代码> AlcAcKelist< <代码>上设置断点来很容易地确定你自己,看看里面有什么,如果你以前从未做过,你应该考虑尝试一下。