向 TextInputLayout 添加高程不起作用

Question

I'm using the TextInputLayout and MaterialAutoCompleteTextView from Material Design's text fields to create a dropdown menu as follows:

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/drop_down_menu"
    style="@style/Widget.MaterialComponents.TextInputLayout.FilledBox.ExposedDropdownMenu"
    android:layout_width="wrap_content"
    android:layout_height="0dp"
    android:layout_marginEnd="8dp"
    android:theme="@style/Theme.MaterialComponents.Light.DarkActionBar"
    app:boxBackgroundColor="@android:color/white"
    app:layout_constraintBottom_toBottomOf="@+id/text_view_1"
    app:layout_constraintEnd_toStartOf="@+id/button_1"
    app:layout_constraintTop_toTopOf="@+id/text_view_1">

    <com.google.android.material.textfield.MaterialAutoCompleteTextView
        android:id="@+id/auto_complete_options"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="none"
        android:paddingStart="8dp"
        android:paddingEnd="8dp" />
</com.google.android.material.textfield.TextInputLayout>

The problem is if I add android:elevation="4dp" to TextInputLayout , nothing changes. Why is that? How do I add elevation to my TextInputLayout ?

Answer 1

Currently there is no work around for elevation into text layouts. All you can do is put your text input layout in a card view and give elevation in it. That is how you can achieve it.

<androidx.cardview.widget.CardView 
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:clipToPadding="false"
        android:elevation="8dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >