覆盖editTextStyle不适用于最新的Material Components基本样式

问题描述

在我的一个应用程序中，我使用Theme.MaterialComponents.Light.NoActionBar作为基本样式.在我称为AppTheme的这种样式中，我试图覆盖editTextStyle为com.google.android.material.textfield.TextInputEditText提供自定义样式(根据源代码，它使用R.attr.editTextStyle作为默认样式).

In an app of mine, I'm using the Theme.MaterialComponents.Light.NoActionBar as a base style. In this style, which I call AppTheme, I'm trying to override editTextStyle to provide a custom style for com.google.android.material.textfield.TextInputEditText (according to the source code, it uses R.attr.editTextStyle as a default style).

这是我当前的主题，与TIEditText和TILayout相关:

This is my current theme, related to the TIEditText and TILayout:

<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
    [ primary and secondary colors, OnColors, etc.]
    <item name="editTextStyle">@style/AppTheme.TextInputEditText</item>
    <item name="textInputStyle">@style/AppTheme.TextInputLayout</item>

    [ Custom attribute for testing, defined in attrs.xml ]
    <item name="textInputEditTextStyle">@style/AppTheme.TextInputEditText</item>
</style>

由于某些原因，即使我设置了editTextStyle，如果我在代码中使用它，它也不会被应用:

For some reason, even though I set editTextStyle, if I use it in code, it does not get applied:

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/tilFirstName"
    style="?attr/textInputStyle"
    android:hint="@string/label_firstname"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/firstName"
        style="?attr/editTextStyle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:text="@={viewModel.firstName}" />
</com.google.android.material.textfield.TextInputLayout>

但是，如果我将firstName的样式替换为?attr/textInputEditTextStyle，它会起作用.

However if I replace the style of firstName with ?attr/textInputEditTextStyle, it works.

为什么不能在默认主题中覆盖editTextStyle?到底是怎么回事?

Why can't I override editTextStyle in the default theme? What the hell is going on?

目标SDK为28，minSDK为21，材料库版本为1.1.0-alpha06

Target SDK is 28, minSDK is 21, Material library version is 1.1.0-alpha06

推荐答案

之所以会发生这种情况，是因为TextInputLayout的默认样式会使用materialThemeOverlay属性覆盖 editTextStyle .

It happens because the default styles of the TextInputLayout override the editTextStyle using the materialThemeOverlay attribute.

例如，Widget.MaterialComponents.TextInputLayout.FilledBox具有以下默认样式:

For example the Widget.MaterialComponents.TextInputLayout.FilledBox has this default style:

<style name="Widget.MaterialComponents.TextInputLayout.FilledBox" parent="Base.Widget.MaterialComponents.TextInputLayout">
    <item name="materialThemeOverlay">
       @style/ThemeOverlay.MaterialComponents.TextInputEditText.FilledBox
    </item>
    ....
</style>
<style name="ThemeOverlay.MaterialComponents.TextInputEditText.FilledBox">
    <item name="editTextStyle">@style/Widget.MaterialComponents.TextInputEditText.FilledBox</item>
</style>

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