Faced this issue when implementing AndroidX in my existing project.

implementation 'com.google.android.material:material:1.0.0-beta01'

Layout XML

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/userNameWrapper"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/TextLabel">

Old Style

<style name="TextLabel" parent="TextAppearance.AppCompat">
        <item name="android:textColorHint">@color/hint_color</item>
        <item name="android:textSize">@dimen/text_20sp</item>
        <item name="colorControlNormal">@color/primaryGray</item>
        <item name="colorControlActivated">@color/colorPrimary</item>
    </style>

New Style

<style name="TextLabel" parent="Widget.MaterialComponents.TextInputLayout.FilledBox">
        <item name="android:textColorHint">@color/hint_color</item>
        <item name="android:textSize">@dimen/text_20sp</item>
        <item name="colorControlNormal">@color/primaryGray</item>
        <item name="colorControlActivated">@color/colorPrimary</item>
    </style>

Update your themes in @style folder by inheriting one of the followings:

Theme.MaterialComponents
Theme.MaterialComponents.NoActionBar
Theme.MaterialComponents.Light
Theme.MaterialComponents.Light.NoActionBar
Theme.MaterialComponents.Light.DarkActionBar

like this:

    <style name="AppTheme.NoActionBar"    parent="Theme.MaterialComponents.Light.NoActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimaryCustom</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDarkCustom</item>
    <item name="colorAccent">@color/colorAccentCustom</item>
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
</style>