Android自定义视图将attrubute传递给子视图？

Question

您好，我创建了一个自定义视图，该视图扩展了下面的约束布局：

class CustomEditText : ConstraintLayout, TextWatcher {
override fun afterTextChanged(p0: Editable?) {
    TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}

override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
    TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}

override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
    TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}

constructor(context: Context, attrs: AttributeSet) : this(context, attrs, android.R.attr.editTextStyle)

constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(context, attrs, android.R.attr.editTextStyle) {
    init(context, attrs, android.R.attr.editTextStyle)
}

private fun init(context: Context, attrs: AttributeSet, defStyleAttr: Int) {
    inflate(context, R.layout.my_edit_text, this)
    val a = context.theme.obtainStyledAttributes(attrs, R.styleable.MyEditText, defStyleAttr, 0)


    //if label text set, show it

    //if desc text set show it

    //set error text


    //else pass the other attrubute sets to the editText as per normal
    //editTextView.setAttributes????

 }
}

此布局在xml中如下所示：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">

    <TextView
        android:id="@+id/labelText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="@style/BoldTextAppearance"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="Label Here" />

    <TextView
        android:id="@+id/descriptionText"
        style="@style/MyTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="@id/labelText"
        tools:text="description goes here" />

    <ImageView
        android:id="@+id/errorIcon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/btn_verify_reg_error_bg"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="@id/descriptionText" />

    <TextView
        android:id="@+id/errorText"
        style="@style/MyTextViewError"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toRightOf="@id/errorIcon"
        app:layout_constraintTop_toBottomOf="@id/descriptionText"
        tools:text="Error goes here" />

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@+id/errorText">

        <TextView
            android:id="@+id/sideHintText"
            style="@style/TextAppearance.grey"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:text="123456" />

        <ImageView
            android:id="@+id/rightIcon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintRight_toRightOf="parent" />

        <EditText
            android:id="@+id/editTextView"
            style="@style/editTextNoBg"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_constraintHorizontal_chainStyle="spread"
            app:layout_constraintLeft_toRightOf="@id/sideHintText"
            app:layout_constraintRight_toLeftOf="@+id/rightIcon" />
    </android.support.constraint.ConstraintLayout>


</android.support.constraint.ConstraintLayout>

我创建了一些自定义属性，这些属性填充了称为descriptionText，errorText等的视图

<declare-styleable name="CustomEditText">
    <attr name="leftHintText" format="string" />
    <attr name="label" format="string" />
    <attr name="description" format="string" />
    <attr name="errorText" format="string" />
    <attr name="rightActionSrc" format="reference" />
</declare-styleable>

使用此自定义视图时，我使用以下内容：

<com.main.main.ui.CustomEditText
    android:id="@+id/titleOtherTextField"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="@dimen/margin_small"
    android:inputType="text"
    android:maxLength="5"
    app:leftHintText="name"
    app:label="firstName"
    app:layout_constraintTop_toBottomOf="@+id/titleSpinner" />

我的问题是，如何将上面的默认android: attributes（例如android:maxLength，android:inputType等）传递到位于自定义视图中的editTextView？ / p>

我的理解是，只有父视图才能获得android: attributes，即我的constraintLayout，但是我想知道是否可以将其中一些传递给editText，因为我不想复制诸如android:inputType之类的东西和android:maxLength（已在android中定义）。我只是想将这些传递给我正在膨胀的视图xml中的editText子视图。