如何在android中逐步添加数据？

Question

我想通过 kotlin 语言 来实现这个添加。分步：

1. 对于每个需要添加的数据，用户点击+Add other deposit，代表第一个允许添加新数据的区域，+Add other deposit按钮向下。
2. 如果用户想取消添加功能，只需点击×按钮取消，+Add other deposit按钮再次返回。
3. EditText 中输入的数据和RadioButton 中选择的选项被保存在变量中并由FloatingActionButton 提交。

非常感谢您提前做出的努力

Answer 1

这可以通过创建一个列表来完成，当您单击 +添加其他存款按钮时，您可以使用 recyclerview 适配器将新项目添加到列表中。输入字段的一个问题，我在用户按下键盘上的完成按钮时保存信息，也可以在失去焦点时保存字段中的数据，决定按下后保存更好。

package com.myply.myapplication

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.TextView
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.google.android.material.floatingactionbutton.FloatingActionButton

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val btnAddOtherDeposit = findViewById<TextView>(R.id.btn_add_other_deposit)
        val rvCustomers = findViewById<RecyclerView>(R.id.rv_customers)
        val fabDone = findViewById<FloatingActionButton>(R.id.fab_done)

        val adapter = MyRecyclerAdapter(this, arrayListOf(CustomerModel()))
        rvCustomers.adapter = adapter
        rvCustomers.layoutManager = LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)

        adapter.mClickListener = object : MyRecyclerAdapter.ItemClickListener {
            override fun onItemRemoveClicked(position: Int) {
                adapter.removeAt(position)
            }
        }
        btnAddOtherDeposit.setOnClickListener {
            /*add empty model without information */
            adapter.add(CustomerModel())
        }
        fabDone.setOnClickListener {
            /*collect all data*/
            var customers = adapter.data
        }
    }
}

适配器

package com.myply.myapplication

import android.content.Context
import android.view.KeyEvent
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.view.inputmethod.EditorInfo
import android.widget.EditText
import android.widget.ImageView
import android.widget.RadioButton
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

class MyRecyclerAdapter internal constructor(
    val context: Context?,
    val data: MutableList<CustomerModel>
) : RecyclerView.Adapter<MyRecyclerAdapter.ViewHolder>() {
    var mClickListener: ItemClickListener? = null

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view = LayoutInflater.from(context).inflate(R.layout.item_customer, parent, false)
        return ViewHolder(view)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val customer = data[position]

        holder.editName.setText(customer.name)

        holder.rbDeposit.setOnCheckedChangeListener(null)
        holder.rbCheque.setOnCheckedChangeListener(null)

        holder.rbDeposit.isChecked = customer.depositType == "Deposit"
        holder.rbCheque.isChecked = customer.depositType == "Cheque"

        holder.btnRemove.setOnClickListener { mClickListener?.onItemRemoveClicked(position) }
        holder.editName.setOnEditorActionListener(object : TextView.OnEditorActionListener {
            override fun onEditorAction(p0: TextView?, actionId: Int, event: KeyEvent?): Boolean {
                if (actionId == EditorInfo.IME_ACTION_SEARCH || actionId == EditorInfo.IME_ACTION_DONE || event?.action == KeyEvent.ACTION_DOWN && event?.keyCode == KeyEvent.KEYCODE_ENTER) {
                    customer.name = holder.editName.text.toString()

                    holder.editName.clearFocus()

                    update(customer, position)
                    return true
                }
                return false
            }
        })
        holder.rbDeposit.setOnCheckedChangeListener { compoundButton, b ->
            customer.depositType = "Deposit"

            update(customer, position)
        }
        holder.rbCheque.setOnCheckedChangeListener { compoundButton, b ->
            customer.depositType = "Cheque"

            update(customer, position)
        }
    }

    override fun getItemCount(): Int {
        return data.size
    }

    fun add(customer: CustomerModel) {
        data.add(customer)
        notifyItemInserted(data.size - 1)
    }

    fun update(customer: CustomerModel, position: Int) {
        data[position] = customer
        notifyItemChanged(position)
    }

    fun removeAt(position: Int) {
        data.removeAt(position)
        notifyItemRemoved(position)
        notifyItemRangeChanged(position, data.size)
    }

    inner class ViewHolder internal constructor(itemView: View) :
        RecyclerView.ViewHolder(itemView) {
        var editName: EditText = itemView.findViewById(R.id.edit_name)
        var btnRemove: ImageView = itemView.findViewById(R.id.btn_remove)
        var rbDeposit: RadioButton = itemView.findViewById(R.id.rb_deposit)
        var rbCheque: RadioButton = itemView.findViewById(R.id.rb_cheque)
    }

    interface ItemClickListener {
        fun onItemRemoveClicked(position: Int)
    }
}

item_customer.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <androidx.appcompat.widget.AppCompatEditText
            android:id="@+id/edit_name"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:imeOptions="actionDone"
            android:singleLine="true" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <RadioButton
                android:id="@+id/rb_deposit"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Deposit type" />

            <RadioButton
                android:id="@+id/rb_cheque"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Cheque" />
        </LinearLayout>
    </LinearLayout>

    <androidx.appcompat.widget.AppCompatImageView
        android:id="@+id/btn_remove"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        app:srcCompat="@android:drawable/ic_menu_close_clear_cancel" />
</RelativeLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/rv_customers"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />

            <androidx.appcompat.widget.AppCompatTextView
                android:id="@+id/btn_add_other_deposit"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="end"
                android:text="Add other deposit" />
        </LinearLayout>

    </androidx.core.widget.NestedScrollView>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab_done"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:layout_margin="16dp" />

</RelativeLayout>