Java 尝试更新cardview时，创建了两个cardview

我正在尝试设计一个页面，其中地址存储在recycler view->cardview中

当用户单击活动A中的“添加地址”按钮时，用户将被导航到活动B中的“添加地址”页面。在此，用户可以输入客户名称、地址行1和地址行2

类似地，当用户单击活动A**（活动A中的数据传递给活动B）**中的编辑地址按钮时，用户将被导航到活动B中的编辑地址页面。在此，用户可以输入客户名称、地址行1和地址行2、城市、州和pincode

在活动B中单击“保存”按钮后，现有的cardview应使用活动A中的新信息进行更新

此设计与亚马逊移动应用程序添加地址选项类似。

示例：如果用户有多个地址（A、B和C），并单击地址B cardview中的编辑按钮。然后将用户导航到活动B以编辑地址，单击保存按钮后，地址B cardview应更新为最新信息

目前的实际结果：将使用更新的信息创建一个新的cardview，而不是在现有的cardview中进行更新

活动A中的代码：我正在对addAddress和editAddress使用相同的onActivityResult（）

public class ProfileManageAdressFragment extends AppCompatActivity {

    RecyclerView recyclerView;
    ProfileManageAddressRecyclerAdapter adapter;
    ArrayList<ProfileManageAddressGetterSetter> reviews;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        
        Button addAddress;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_profile_manage_adress);
        addAddress = findViewById(R.id.addNewAddress);
        addAddress.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(v.getContext(), "Clicked", Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(ProfileManageAdressFragment.this, AddNewAddress.class);
                startActivityForResult(intent, 1);
            }
        });
        reviews = new ArrayList<>();
        recyclerView = findViewById(R.id.addressRecyclerView);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(ProfileManageAdressFragment.this));

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        String customer_name, address_one, address_two, city, state, pincode;
        if (requestCode == 1 && resultCode == RESULT_OK) {
            customer_name = data.getStringExtra("customer_name");
            address_one = data.getStringExtra("address_one");
            address_two = data.getStringExtra("address_two");
            city = data.getStringExtra("city");
            state = data.getStringExtra("state");
            pincode = data.getStringExtra("pincode");

            reviews.add(new ProfileManageAddressGetterSetter(customer_name, address_one, address_two, city, state, pincode));
            adapter = new ProfileManageAddressRecyclerAdapter(ProfileManageAdressFragment.this, reviews);
            recyclerView.setAdapter(adapter);
            adapter.notifyDataSetChanged();

            //saveData(customer_name, address_one, address_two, city, state, pincode);

        } else if (requestCode == 2 && resultCode == RESULT_OK) {
            customer_name = data.getStringExtra("customer_name");
            address_one = data.getStringExtra("address_one");
            address_two = data.getStringExtra("address_two");
            city = data.getStringExtra("city");
            state = data.getStringExtra("state");
            pincode = data.getStringExtra("pincode");
            
            reviews.add(new ProfileManageAddressGetterSetter(customer_name, address_one, address_two, city, state, pincode));
            adapter = new ProfileManageAddressRecyclerAdapter(ProfileManageAdressFragment.this, reviews);
            recyclerView.setAdapter(adapter);
            //adapter.notifyDataSetChanged();
        } else if (resultCode == RESULT_CANCELED) {
            Toast.makeText(ProfileManageAdressFragment.this, "Cancelled", Toast.LENGTH_SHORT).show();
        }
    }
}

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我是android新手，请帮我解决这个问题。万分感谢您提供的解决方案！：）

你又犯了同样的错误

每次在onActivityResult中重新初始化列表和适配器，因此每次数据长度为1时，都会重新初始化列表并添加新数据

针对您当前的情况

---

无法编辑已添加的列表数据。因此，您需要做两件事，将cardView或list position传递给活动2，并在成功编辑后再次将pass position传递给活动1。现在你有了一个职位。在onActivityResult中，使用类似于

list.remove（位置）的位置从列表中删除数据并在删除后向该位置添加数据，如所示<代码>列表。添加（位置、数据）
您是否将地址存储在类似SharedPrefs的位置？我计划使用房间数据库而不是共享首选项。但到目前为止，唯一值得关注的是，当我编辑cardview（更新）时，会创建一张新卡，而不是修改现有卡。我已在onCreate only中初始化了列表。如果我没有在onActivityResult中调用set适配器，那么在我的情况下，不会创建cardview本身。现在，使用上面的代码，可以一个接一个地创建cardview。如果像你说的那样，如果重新初始化它，它不会在另一个下面创建一个cardview，它只会覆盖现有的一个；和列表。添加（位置、数据）；就是我昨晚经历的那个。我将尝试并发布答案。@SapthagiriManivannan在onCreate中初始化此内容，并在onResult中调用adapter.notifyDataSetChange。如果您已经完成了，请使用新的代码段评论更新您的问题。添加（新ProfileManageAddressGetterSetter（客户名称、地址、地址、城市、州、pincode））；适配器=新的ProfileManageAddressRecyclerAdapter（ProfileManageAddressFragment.this，reviews）；recyclerView.setAdapter（适配器）；嘿，兄弟，@deepakgupta7403请仔细研究这个链接中的问题，看看你是否有答案。谢谢
public class ProfileManageAddressRecyclerAdapter extends RecyclerView.Adapter<ProfileManageAddressRecyclerAdapter.ViewHolder> {

    private ArrayList<ProfileManageAddressGetterSetter> mDataset = new ArrayList<>();

    private String sCustomer_name, sAddress_one, sAddress_two, sCity, sState, sPincode;

    public static class ViewHolder extends RecyclerView.ViewHolder {
        private TextView customer_name, address_one, address_two, city, state, pincode;
        private Button edit, remove;

        public ViewHolder(View v) {
            super(v);
            customer_name = (TextView) v.findViewById(R.id.customerName);
            address_one = (TextView) v.findViewById(R.id.addressLineOne);
            address_two = v.findViewById(R.id.addressLineTwo);
            city = (TextView) v.findViewById(R.id.cardCity);
            state = (TextView) v.findViewById(R.id.cardState);
            pincode = v.findViewById(R.id.cardPincode);
            edit = v.findViewById(R.id.editAddress);
            remove = v.findViewById(R.id.removeAddress);
        }
    }

    public ProfileManageAddressRecyclerAdapter(ProfileManageAdressFragment profileManageAdressFragment, ArrayList<ProfileManageAddressGetterSetter> dataset) {
        mDataset.clear();
        mDataset.addAll(dataset);
    }

    @Override
    public ProfileManageAddressRecyclerAdapter.ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {

        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_manage_address, parent, false);
        final ProfileManageAddressRecyclerAdapter.ViewHolder vh = new ProfileManageAddressRecyclerAdapter.ViewHolder(view);
        return vh;
    }

    @Override
    public void onBindViewHolder(@NonNull final ProfileManageAddressRecyclerAdapter.ViewHolder holder, int position) {
        ProfileManageAddressGetterSetter profileManageAddressGetterSetter = mDataset.get(position);
        holder.address_one.setText(profileManageAddressGetterSetter.getAddress_line_1());
        holder.address_two.setText(profileManageAddressGetterSetter.getGetAddress_line_2());
        holder.customer_name.setText(profileManageAddressGetterSetter.getContractor_name());
        holder.city.setText(profileManageAddressGetterSetter.getCity());
        holder.state.setText(profileManageAddressGetterSetter.getState());
        holder.pincode.setText(profileManageAddressGetterSetter.getPincode());

        holder.edit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(v.getContext(), EditNewAddress.class);
                switch (holder.getAdapterPosition()) {

                    case 0:
                        mDataset.remove(holder.getAdapterPosition());
                        notifyItemRemoved(holder.getAdapterPosition());
                        notifyItemRangeChanged(holder.getAdapterPosition(), mDataset.size());

                        Toast.makeText(v.getContext(), "Clicked", Toast.LENGTH_SHORT).show();
                        System.out.println("*********" + holder.address_one.getText());

                        sCustomer_name = holder.customer_name.getText().toString();
                        sAddress_one = holder.address_one.getText().toString();
                        sAddress_two = holder.address_two.getText().toString();
                        sCity = holder.city.getText().toString();
                        sState = holder.state.getText().toString();
                        sPincode = holder.pincode.getText().toString();

                        intent.putExtra("customer_name", sCustomer_name);
                        intent.putExtra("address_one", sAddress_one);
                        intent.putExtra("address_two", sAddress_two);
                        intent.putExtra("city", sCity);
                        intent.putExtra("state", sState);
                        intent.putExtra("pincode", sPincode);

                        ((Activity) v.getContext()).startActivityForResult(intent,2);
                        break;
                    case 1:
                        Toast.makeText(v.getContext(), "Clicked", Toast.LENGTH_SHORT).show();
                        System.out.println("*********" + holder.address_one.getText());

                        sCustomer_name = holder.customer_name.getText().toString();
                        sAddress_one = holder.address_one.getText().toString();
                        sAddress_two = holder.address_two.getText().toString();
                        sCity = holder.city.getText().toString();
                        sState = holder.state.getText().toString();
                        sPincode = holder.pincode.getText().toString();


                        intent.putExtra("customer_name", sCustomer_name);
                        intent.putExtra("address_one", sAddress_one);
                        intent.putExtra("address_two", sAddress_two);
                        intent.putExtra("city", sCity);
                        intent.putExtra("state", sState);
                        intent.putExtra("pincode", sPincode);
                        ((Activity) v.getContext()).startActivityForResult(intent,2);
                        break;
                }
            }
        });

        holder.remove.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mDataset.remove(holder.getAdapterPosition());
                notifyItemRemoved(holder.getAdapterPosition());
                notifyItemRangeChanged(holder.getAdapterPosition(), mDataset.size());
            }
        });
    }

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

public class EditNewAddress extends AppCompatActivity {

    private EditText customer_name, address_one, address_two, city, state, pincode;
    private Button add_address;
    private String sCustomer_name, sAddress_one, sAddress_two, sCity, sState, sPincode;

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

        customer_name = findViewById(R.id.customerName);
        address_one = findViewById(R.id.addressOne);
        address_two = findViewById(R.id.addressTwo);
        add_address = findViewById(R.id.addAddress);
        city = findViewById(R.id.city);
        state = findViewById(R.id.state);
        pincode = findViewById(R.id.pincode);

        Intent intent = getIntent();
        sCustomer_name = intent.getStringExtra("customer_name");
        sAddress_one = intent.getStringExtra("address_one");
        sAddress_two = intent.getStringExtra("address_two");
        sCity = intent.getStringExtra("city");
        sState = intent.getStringExtra("state");
        sPincode = intent.getStringExtra("pincode");

        customer_name.setText(sCustomer_name);
        address_one.setText(sAddress_one);
        address_two.setText(sAddress_two);
        city.setText(sCity);
        state.setText(sState);
        pincode.setText(sPincode);

        add_address.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(customer_name.getText().toString().equals("") || address_one.getText().toString().equals("") ||
                        address_two.getText().toString().equals("") || city.getText().toString().equals("") ||
                        state.getText().toString().equals("") || pincode.getText().toString().equals("")
                        ) {
                    Toast.makeText(EditNewAddress.this, "Please input all fields", Toast.LENGTH_LONG).show();
                }else {
                    sCustomer_name = customer_name.getText().toString();
                    sAddress_one = address_one.getText().toString();
                    sAddress_two = address_two.getText().toString();
                    sCity = city.getText().toString();
                    sState = state.getText().toString();
                    sPincode = pincode.getText().toString();

                    Intent intent = new Intent(EditNewAddress.this, ProfileManageAdressFragment.class);
                    intent.putExtra("customer_name", sCustomer_name);
                    intent.putExtra("address_one", sAddress_one);
                    intent.putExtra("address_two", sAddress_two);
                    intent.putExtra("city", sCity);
                    intent.putExtra("state", sState);
                    intent.putExtra("pincode", sPincode);
                    setResult(RESULT_OK, intent);
                    finish();
                }
            }
        });
    }
}