EditText设置错误提示后光标变为黑色的异常问题排查

我在开发App时遇到一个诡异Bug：将EditText的光标颜色设置为白色（默认是深蓝色），正常状态下显示正常，但调用binding.inputEmailWrapper.error = getString(R.string.email_invalid)设置错误提示后，光标颜色变为黑色。主题中从未将黑色定义为主色调、强调色或表面色，按预期光标应保持原有颜色。

尝试过的操作及结果：

• 将textCursorDrawable设为null：错误状态下光标仍为白色（与文本颜色一致），但光标厚度消失
• 设置静态Drawable：错误状态下光标依然变黑

布局代码 #

<com.google.android.material.textfield.TextInputLayout
                    android:id="@+id/input_email_wrapper"
                    style="@style/TextInputLayoutStyle"
                    android:layout_width="0dp"
                    android:hint="@string/email_address"
                    android:labelFor="@id/input_email">

                    <com.google.android.material.textfield.TextInputEditText
                        android:id="@+id/input_email"
                        style="@style/TextInputEditText"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:afterTextChanged="@={viewModel::emailAfterTextChanged}"
                        android:inputType="textEmailAddress"
                        android:text="@={viewModel.user.email}"
                        tools:text="max@muster.de" />

                </com.google.android.material.textfield.TextInputLayout>

ViewModel错误设置代码 #

binding.inputEmailWrapper.error = getString(R.string.email_invalid)

样式代码 #

<style name="TextInputLayoutStyle" parent="Widget.MaterialComponents.TextInputLayout.OutlinedBox">
        <item name="boxStrokeColor">@color/edit_text_border_selector</item>
        <item name="hintTextColor">@color/white</item>
        <item name="android:textColorHint">@color/edit_text_border_selector</item>
        <item name="endIconTint">@color/edit_text_border_selector</item>
        <item name="android:layout_width">0dp</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:layout_marginTop">@dimen/margin_top</item>
        <item name="materialThemeOverlay">@style/EditTextTheme</item>
    </style>

    <style name="TextInputEditText">
        <item name="android:textColor">@color/edit_text_content_color</item>
        <item name="android:textCursorDrawable">@drawable/edit_text_cursor</item>
    </style>

    <style name="EditTextTheme" parent="ThemeOverlay.MaterialComponents.TextInputEditText.OutlinedBox">
        <item name="colorError">@color/red</item>
        <item name="colorPrimary">@color/white</item>
        <item name="colorControlActivated">@color/white</item>
        <item name="colorAccent">@color/orange</item>
    </style>

光标Drawable代码（添加前已存在问题） #

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <size android:width="2dp" />
    <solid android:color="?base_100" />
</shape>

注：所有颜色选择器均未使用黑色值，已通过截图确认光标为纯黑色。

App主题代码 #

<style name="AppThemeBJ" parent="Theme.MaterialComponents.NoActionBar">
        <!--Some MUST reference color resources instead of direct hex values
        as in code the color resource for the attribute may be fetched in some cases-->
        <item name="colorPrimary">@color/darkblue</item>
        <item name="colorPrimaryDark">@color/darkblue</item>
        <item name="colorAccent">@color/orange</item>
        <item name="colorError">@color/red</item>
        <item name="colorSecondary">@color/orange</item>
        <item name="colorOnSecondary">@color/white</item>
        <item name="preferenceTheme">@style/Theme.WtfPreference</item>
        <item name="android:colorBackground">@color/darkerblue</item>
        <item name="snackbarStyle">@style/SnackbarStyle</item>
        <item name="materialTimePickerTheme">@style/TimepickerStyle</item>
    </style>

状态截图描述 #

• 错误状态带光标：输入框处于错误状态（红色边框），光标为纯黑色
• 错误状态选中：输入框文本选中区域颜色正常，仅光标为黑色
• 正常状态：光标为白色，输入框显示正常

补充编辑 #

编辑1：即使移除materialThemeOverlay和textCursorDrawable，错误状态下光标变黑的问题仍存在
编辑2：该Bug仅在OutlinedBox样式下出现，使用以下样式时，错误状态下光标保持激活色（橙色）：

<style name="TextInputLayoutStyle" parent="Widget.Design.TextInputLayout">
        <item name="hintTextColor">@color/orange</item>
        <item name="hintTextAppearance">@style/HintTextAppearance</item>
        <item name="android:layout_width">0dp</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:layout_marginTop">@dimen/margin_top</item>
        <item name="colorPrimary">@color/orange</item>
    </style>

内容的提问来源于stack exchange，提问作者Sarah Multitasker