我有十个ExitText，我想把它的值加到一个ArrayList中，然后把它们加到Firebase中。
如何将值添加到Kotlin的ArrayList中？
我知道这不是应该做的，但我只是在尝试，我被困在循环和添加到数组中。我知道我可以使用zipCodeList.add进行添加，但我不知道如何循环EditText并获得值。
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Kotlin寻找一个答案。
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)
完成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()
}
}
下面是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>
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，而不需要处理它们的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，您可以迭代RelativeLayout的子级并找到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：
如何将其写成函数，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
}
}
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
}