如何将 EditText 值添加到 Kotlin 中的 ArrayList？

Question

我有十个 ExitText，我想将其值添加到 ArrayList，然后将它们添加到 Firebase。

如何在 Kotlin 中将值添加到 ArrayList 中？

我知道这不是应该这样做的，但我只是在尝试，我被困在循环并添加到数组中。我知道我可以使用 zipCodeList.add 来添加，但我不知道如何循环通过 EditTexts 并获取值。

fun createListOfZipCodes (): ArrayList<ZipCode>{
    
            zip_one=binding.etZipCodeOne.text.toString()
            zip_two=binding.etZipCodeTwo.text.toString()
            zip_three=binding.etZipCodeThree.text.toString()
            zip_four=binding.etZipCodeFour.text.toString()
            zip_five=binding.etZipCodeFive.text.toString()
            zip_six=binding.etZipCodeSix.text.toString()
            zip_seven=binding.etZipCodeSeven.text.toString()
            zip_eight=binding.etZipCodeEight.text.toString()
            zip_nine=binding.etZipCodeNine.text.toString()
            zip_ten=binding.etZipCodeTen.text.toString()
    
    /// I HAVE NO IDEA HOW TO LOOP THROUGH EACH EDIT TEXT AND GET THE VALUE.
    
            return zipCodeList
    
}

我正在寻找在 Kotlin 中执行此操作的答案。

谢谢。

---

编辑 2

class AssignZIPCodeActivity : AppCompatActivity() {
    
        private lateinit var binding:ActivityAssignZipcodeBinding
    
    
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
    
            binding= ActivityAssignZipcodeBinding.inflate(layoutInflater)
            setContentView(binding.root)
            
            }
    
    }

---

编辑：

错误

    2021-07-02 21:08:30.525 21588-21588/com.trad E/RecyclerView: No adapter attached; skipping layout
2021-07-02 21:08:35.505 21588-21588/com.trad E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.trad, PID: 21588
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.trad/com.trad.ui.activities.AssignZIPCodeActivity}: kotlin.UninitializedPropertyAccessException: lateinit property binding has not been initialized
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3683)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3968)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2307)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:246)
        at android.app.ActivityThread.main(ActivityThread.java:8512)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
     Caused by: kotlin.UninitializedPropertyAccessException: lateinit property binding has not been initialized
        at com.trad.ui.activities.AssignZIPCodeActivity.<init>(AssignZIPCodeActivity.kt:18)
        at java.lang.Class.newInstance(Native Method)
        at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95)
        at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:45)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1253)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3671)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3968) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2307) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:246) 
        at android.app.ActivityThread.main(ActivityThread.java:8512) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130) 

完整的 Kotlin 代码。

    class AssignZIPCodeActivity : AppCompatActivity() {

    private lateinit var binding:ActivityAssignZipcodeBinding
    private lateinit var zipCodeList:ArrayList<String>

     val fields = listOf(
        binding.etZipCodeOne,
        binding.etZipCodeTwo,
        binding.etZipCodeThree,
        binding.etZipCodeFour,
        binding.etZipCodeFive,
        binding.etZipCodeSix,
        binding.etZipCodeSeven,
        binding.etZipCodeEight,
        binding.etZipCodeNine,
        binding.etZipCodeTen,
    )

    val zipCodes = createListOfZipCodes(fields)


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding= ActivityAssignZipcodeBinding.inflate(layoutInflater)
        setContentView(binding.root)

        binding.btnAddZipCodes.setOnClickListener{
            createListOfZipCodes(fields)
//            Toast.makeText(this@AssignZIPCodeActivity,zipCodeList.toString(),Toast.LENGTH_SHORT).show()
        }
    }

以下是activity_assign_zipcode.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=".ui.activities.AssignZIPCodeActivity">

    <ScrollView
        android:id="@+id/scroll"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true"
        android:scrollbars="none">

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">


            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/til_zip_code_one"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:layout_marginEnd="16dp"
                android:hint="ZIP Code 1"
                android:textColorHint="@color/colorSecondaryText">

                <com.trad.utils.MSPEditText
                    android:id="@+id/et_zip_code_one"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="number|numberDecimal"
                    android:padding="@dimen/et_padding"
                    android:textColor="@color/colorPrimaryText"
                    android:textSize="@dimen/et_textSize"/>
            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/til_zip_code_two"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/til_zip_code_one"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:layout_marginEnd="16dp"
                android:hint="ZIP Code 2"
                android:textColorHint="@color/colorSecondaryText">

                <com.trad.utils.MSPEditText
                    android:id="@+id/et_zip_code_two"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="number|numberDecimal"
                    android:padding="@dimen/et_padding"
                    android:textColor="@color/colorPrimaryText"
                    android:textSize="@dimen/et_textSize" />
            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/til_zip_code_three"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/til_zip_code_two"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:layout_marginEnd="16dp"
                android:hint="ZIP Code 3"
                android:textColorHint="@color/colorSecondaryText">

                <com.trad.utils.MSPEditText
                    android:id="@+id/et_zip_code_three"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="number|numberDecimal"
                    android:padding="@dimen/et_padding"
                    android:textColor="@color/colorPrimaryText"
                    android:textSize="@dimen/et_textSize" />
            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/til_zip_code_four"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/til_zip_code_three"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:layout_marginEnd="16dp"
                android:hint="ZIP Code 4"
                android:textColorHint="@color/colorSecondaryText">

                <com.trad.utils.MSPEditText
                    android:id="@+id/et_zip_code_four"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="number|numberDecimal"
                    android:padding="@dimen/et_padding"
                    android:textColor="@color/colorPrimaryText"
                    android:textSize="@dimen/et_textSize" />
            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/til_zip_code_five"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/til_zip_code_four"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:layout_marginEnd="16dp"
                android:hint="ZIP Code 5"
                android:textColorHint="@color/colorSecondaryText">

                <com.trad.utils.MSPEditText
                    android:id="@+id/et_zip_code_five"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="number|numberDecimal"
                    android:padding="@dimen/et_padding"
                    android:textColor="@color/colorPrimaryText"
                    android:textSize="@dimen/et_textSize" />
            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/til_zip_code_six"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/til_zip_code_five"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:layout_marginEnd="16dp"
                android:hint="ZIP Code 6"
                android:textColorHint="@color/colorSecondaryText">

                <com.trad.utils.MSPEditText
                    android:id="@+id/et_zip_code_six"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="number|numberDecimal"
                    android:padding="@dimen/et_padding"
                    android:textColor="@color/colorPrimaryText"
                    android:textSize="@dimen/et_textSize" />
            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/til_zip_code_seven"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/til_zip_code_six"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:layout_marginEnd="16dp"
                android:hint="ZIP Code 7"
                android:textColorHint="@color/colorSecondaryText">

                <com.trad.utils.MSPEditText
                    android:id="@+id/et_zip_code_seven"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="number|numberDecimal"
                    android:padding="@dimen/et_padding"
                    android:textColor="@color/colorPrimaryText"
                    android:textSize="@dimen/et_textSize" />
            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/til_zip_code_eight"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/til_zip_code_seven"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:layout_marginEnd="16dp"
                android:hint="ZIP Code 8"
                android:textColorHint="@color/colorSecondaryText">

                <com.trad.utils.MSPEditText
                    android:id="@+id/et_zip_code_eight"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="number|numberDecimal"
                    android:padding="@dimen/et_padding"
                    android:textColor="@color/colorPrimaryText"
                    android:textSize="@dimen/et_textSize" />
            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/til_zip_code_nine"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/til_zip_code_eight"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:layout_marginEnd="16dp"
                android:hint="ZIP Code 9"
                android:textColorHint="@color/colorSecondaryText">

                <com.trad.utils.MSPEditText
                    android:id="@+id/et_zip_code_nine"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="number|numberDecimal"
                    android:padding="@dimen/et_padding"
                    android:textColor="@color/colorPrimaryText"
                    android:textSize="@dimen/et_textSize" />
            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/til_zip_code_ten"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/til_zip_code_nine"
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:layout_marginEnd="16dp"
                android:hint="ZIP Code 10"
                android:textColorHint="@color/colorSecondaryText">

                <com.trad.utils.MSPEditText
                    android:id="@+id/et_zip_code_ten"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="text"
                    android:padding="@dimen/et_padding"
                    android:textColor="@color/colorPrimaryText"
                    android:textSize="@dimen/et_textSize" />
            </com.google.android.material.textfield.TextInputLayout>

            <com.trad.utils.MSPButton
                android:id="@+id/btn_add_zip_codes"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_marginStart="16dp"
                android:layout_marginTop="30dp"
                android:layout_marginEnd="16dp"
                android:background="@drawable/button_background"
                android:foreground="?attr/selectableItemBackground"
                android:gravity="center"
                android:paddingTop="@dimen/btn_padding"
                android:paddingBottom="@dimen/btn_padding"
                android:text="@string/btn_lbl_submit"
                android:textColor="@android:color/white"
                android:textSize="@dimen/btn_textSize"
                android:layout_below="@id/til_zip_code_ten"/>
        </RelativeLayout>

    </ScrollView>

</RelativeLayout>

Answer 1

这与所指出的不同。 OP 需要有一种更好的方式将元素添加到数组中，而无需处理它们的 id。

因此，为包含 EditText 的RelativeLayout 提供一个 ID：

    <RelativeLayout
        android:id="@+id/root"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

然后您可以遍历RelativeLayout 的孩子并找到TextInputLayout。并重复查找TextInputEditText

val list = arrayListOf<String>()

// Layout that has multiple TextInputLayouts
val root = findViewById<RelativeLayout>(R.id.root)

// Iterating over children of the RelativeLayout
for (item in 0..root.childCount) {
    val child = root.getChildAt(item)
    if (child is TextInputLayout) {
        val editText = (child.getChildAt(0) as FrameLayout).getChildAt(0)
        if (editText is TextInputEditText) list.add(editText.text.toString())
    }
}
Log.d(TAG, "onCreate: $list")

更新：

如何将其编写为函数，以便在单击按钮时调用它？

class AssignZIPCodeActivity : AppCompatActivity() {

    private lateinit var binding:ActivityAssignZipcodeBinding
    private lateinit var zipCodeList:ArrayList<String>


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding= ActivityAssignZipcodeBinding.inflate(layoutInflater)
        setContentView(binding.root)
        
        binding.btnAddZipCodes.setOnClickListener{
              zipCodeList = createListOfZipCodes()

//            Toast.makeText(this@AssignZIPCodeActivity,zipCodeList.toString(),Toast.LENGTH_SHORT).show()
        }
    }
    
    private fun createListOfZipCodes(): ArrayList<String> {
    
        val list = arrayListOf<String>()

        // Layout that has multiple TextInputLayouts
        val root = findViewById<RelativeLayout>(R.id.root)

        // Iterating over children of the RelativeLayout
        for (item in 0..root.childCount) {
            val child = root.getChildAt(item)
            if (child is TextInputLayout) {
                val editText = (child.getChildAt(0) as FrameLayout).getChildAt(0)
                if (editText is com.trad.utils.MSPEditText) list.add(editText.text.toString())
            }
        }   
        return list
    }
    
}

Answer 2

很难做得更好：

val fields = listOf(
        binding.etZipCodeOne,
        binding.etZipCodeTwo,
        binding.etZipCodeThree,
        binding.etZipCodeFour,
        binding.etZipCodeFive,
        binding.etZipCodeSix,
        binding.etZipCodeSeven,
        binding.etZipCodeEight,
        binding.etZipCodeNine,
        binding.etZipCodeTen,
)

val zipCodes = createListOfZipCodes(fields)

fun createListOfZipCodes(fields: List<EditText>): ArrayList<ZipCode> {
    val zipCodeList = mutableListOf<ZipCode>()
    for (filed in fields) {
        zipCodeList.add(filed.text.toString())
    }
    return zipCodeList
}