android - 我需要帮助以将按照我的 'Document' 列表排序的 'Collection' 数据显示到 RecyclerView 中(检索到的数据未按照列表排序，#AskFirebase)

Question

Address collection database image

Document list database image

我想根据我的列表将排序后的数据显示到 RecyclerView 中(我可以检索数据，但它不是根据我的集合列表排序的)。或者，我已经在 Firestore 中对地址集合列表进行了排序并想要获取从 Firestore 文档列表中排序的数据。请找到随附的 Firestore 数据库图像和 Java 代码以了解详细信息。

public class ViewSelectedActivity extends AppCompatActivity {

    private RecyclerView addressRecyclerView;
    private FirebaseFirestore fireStoreDb = FirebaseFirestore.getInstance();
    public static AddressAdapter addressActivityAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view_selected);

        addressRecyclerView = findViewById(R.id.address_recycler_view);
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);

        addressRecyclerView.setLayoutManager(layoutManager);

        final List<AddressModel> addressModelList1 = new ArrayList<>();
        addressModelList1.clear();

        addressModelList1.add(new AddressModel("Ravi11111", "Fist1", "City1", "111111", "111"));//Manual address list is working fine.
        addressModelList1.add(new AddressModel("222", "Fist1", "222", "111111", "111"));
        addressModelList1.add(new AddressModel("Ravi11111", "333", "City33", "111111", "111"));

        fireStoreDb.collection("Selected_user").document("Address").get()
                .addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
                    @Override
                    public void onComplete(@NonNull final Task<DocumentSnapshot> task) {
                        if (task.isSuccessful()) {
                            for (long x = 1; x <= (long) task.getResult().get("Address_Size"); x++) {
                                String addressId = task.getResult().getString("Address_0" + x);

                                fireStoreDb.collection("AddressCollection").document(addressId).get()
                                        .addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
                                            @Override
                                            public void onComplete(@NonNull Task<DocumentSnapshot> task1) {
                                                if (task1.isSuccessful()) {
                                                    addressModelList1
                                                            .add(new AddressModel(task1.getResult().getString("Full_Name")
                                                                    , task1.getResult().getString("House_No")
                                                                    , task1.getResult().getString("City")
                                                                    , task1.getResult().getString("Pincode")
                                                                    , task1.getResult().getString("Mobile_No")));
                                                    addressActivityAdapter.notifyDataSetChanged();
                                                }
                                            }
                                        });
                            }
                        }
                    }
                });

        addressActivityAdapter = new AddressAdapter(addressModelList1);
        addressRecyclerView.setAdapter(addressActivityAdapter);
        //address1adapter.notifyDataSetChanged();
    }
}



public class AddressModel {

    private String name;
    private String house;
    private String city;
    private String pincode;
    private String mobile;

    public AddressModel(String name, String house, String city, String pincode, String mobile) {
        this.name = name;
        this.house = house;
        this.city = city;
        this.pincode = pincode;
        this.mobile = mobile;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getHouse() {
        return house;
    }

    public void setHouse(String house) {
        this.house = house;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getPincode() {
        return pincode;
    }

    public void setPincode(String pincode) {
        this.pincode = pincode;
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }
}


public class AddressAdapter extends RecyclerView.Adapter<AddressAdapter.AddressViewHolder> {

    private List<AddressModel> addressModelList;

    public AddressAdapter(List<AddressModel> addressModelList) {
        this.addressModelList = addressModelList;
    }

    @NonNull
    @Override
    public AddressViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.address_item_layout, viewGroup, false);
        return new AddressViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull AddressViewHolder viewHolder, int position) {

        String b_name = addressModelList.get(position).getName();
        String b_house = addressModelList.get(position).getHouse();
        String b_city = addressModelList.get(position).getCity();
        String b_pincode = addressModelList.get(position).getPincode();
        String b_mobile = addressModelList.get(position).getMobile();

        viewHolder.setData(b_name,b_house,b_city,b_pincode, b_mobile);
    }

    @Override
    public int getItemCount() {
        return addressModelList.size();
    }

    class AddressViewHolder extends RecyclerView.ViewHolder {

        private TextView aname;
        private TextView ahouse;
        private TextView acity;
        private TextView apincode;
        private TextView amobile;

        public AddressViewHolder(@NonNull View itemView) {
            super(itemView);

            aname = itemView.findViewById(R.id.view_full_name);
            ahouse = itemView.findViewById(R.id.view_house_no);
            acity = itemView.findViewById(R.id.view_city);
            apincode = itemView.findViewById(R.id.view_pincode);
            amobile = itemView.findViewById(R.id.view_mobile_no);
        }

        private void setData(String nameText, String houseText, String cityText, String pinText, String mobileText) {
            aname.setText(nameText);
            ahouse.setText(houseText);
            acity.setText(cityText);
            apincode.setText(pinText);
            amobile.setText(mobileText);
        }
    }

}

Answer 1

假设您想要按名称对地址进行排序，在您的 onComplete 回调中，添加一个调用以对列表进行排序:

addressModelList1.add(new AddressModel( ... ));

// Sort list by name:
Collections.sort(addressModelList1, (address1, address2) -> address1.getName().compareTo(address2.getName());

addressActivityAdapter.notifyDataSetChanged();