Attribute to customize Bounding box stroke

I can see that the bounding box for the TextInputLayout has been explicitly declared here:

 defaultStrokeColor =
        ContextCompat.getColor(context, R.color.mtrl_textinput_default_box_stroke_color);
    disabledColor = ContextCompat.getColor(context, R.color.mtrl_textinput_disabled_color);
    hoveredStrokeColor =
        ContextCompat.getColor(context, R.color.mtrl_textinput_hovered_box_stroke_color);

i.e :

https://github.com/material-components/material-components-android/blob/master/lib/java/com/google/android/material/textfield/TextInputLayout.java#L314

Are there plans to provide an attribute that allows developers, to for example override these? For example, use color states?

[petrkubac]

Because the defaultBoxStrokeColor is currently private final int in TextInputLayout class you can change it only by overriding the color resource it uses. This is a temporary solution if you need to change this color until the issue gets resolved.

<color name="mtrl_textinput_default_box_stroke_color" tools:override="true">@color/white_40</color>

[Corsage]

I believe I was able to do it with the following:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@android:color/background_light" android:state_focused="true"/>
    <item android:color="@android:color/background_light" android:state_hovered="true"/>
    <item android:color="@android:color/background_light" android:state_enabled="false"/>
    <item android:color="@android:color/background_light" />
</selector>

Take a note of the different android states, and then lastly the default state. Change the colors accordingly to what you need and then you can use it as a theme, an example is shown below.

<!-- Hint text appearance (used only when the background is colorPrimary). -->
    <style name="TextInputLayoutWhiteBox" parent="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.Dense">
        <item name="boxStrokeColor">@color/layout_text_input_white</item>
        <!-- The color of the label when it is collapsed and the text field is active -->
        <item name="hintTextColor">@android:color/background_light</item>
        <!-- The color of the label in all other text field states (such as resting and disabled) -->
        <item name="android:textColorHint">@android:color/background_light</item>
    </style>