@color对于包含的按钮文本颜色，我们还应该使用新的“ on”颜色属性
<!-- Copyright 2020 Google LLC. SPDX-License-Identifier: Apache-2.0 --> <Button - android:textColor="@android:color/white" + android:textColor="?attr/colorOnPrimary" ... /> 字体板式新的 TextAppearance 样式/属性
MDC字体板式直接从Material Design类型系统中提取。表达的意思就是紧贴 Material Design 风格
引入了一组新的TextAppearance.MaterialComponents.*样式和相应的textAppearance*主题属性，它们替代了现有的AppCompat /框架样式。
MDC小部件使用这些属性来设置文本样式。要知道哪些窗口小部件使用哪种类型板式，需要检查源代码中的默认窗口小部件样式。
请参阅下面的完整类型样式和属性映射表： 13 种类型
AppCompat文字样式 MDC-Android文字样式 MDC-Android文字属性TextAppearance.AppCompat.Display4 TextAppearance.MaterialComponents.Headline1 textAppearanceHeadline1
TextAppearance.AppCompat.Display3 TextAppearance.MaterialComponents.Headline2 textAppearanceHeadline2
TextAppearance.AppCompat.Display2 TextAppearance.MaterialComponents.Headline3 textAppearanceHeadline3
TextAppearance.AppCompat.Display1 TextAppearance.MaterialComponents.Headline4 textAppearanceHeadline4
TextAppearance.AppCompat.Headline TextAppearance.MaterialComponents.Headline5 textAppearanceHeadline5
TextAppearance.AppCompat.Title TextAppearance.AppCompat.Large TextAppearance.MaterialComponents.Headline6 textAppearanceHeadline6
TextAppearance.AppCompat.Subhead TextAppearance.AppCompat.Menu TextAppearance.MaterialComponents.Subtitle1 textAppearanceSubtitle1
TextAppearance.AppCompat.Small TextAppearance.MaterialComponents.Subtitle2 textAppearanceSubtitle2
TextAppearance.AppCompat.Body1 TextAppearance.MaterialComponents.Body1 textAppearanceBody1
TextAppearance.AppCompat.Body2 TextAppearance.MaterialComponents.Body2 textAppearanceBody2
TextAppearance.AppCompat.Button TextAppearance.MaterialComponents.Button textAppearanceButton
TextAppearance.AppCompat.Caption TextAppearance.MaterialComponents.Caption textAppearanceCaption
不适用 TextAppearance.MaterialComponents.Overline textAppearanceOverline
例子 <com.google.android.material.card.MaterialCardView ...> ... <TextView android:id=”@+id/headerText” - android:textAppearance="@style/TextAppearance.AppCompat.Title" + android:textAppearance="?attr/textAppearanceHeadline6" ... /> <TextView android:id=”@+id/subheadText” android:textColor="?android:attr/textColorSecondary" - android:textAppearance="@style/TextAppearance.AppCompat.Body2" + android:textAppearance="?attr/textAppearanceBody2" ... /> <TextView android:id=”@+id/supportingText” android:textColor="?android:attr/textColorSecondary" - android:textAppearance="@style/TextAppearance.AppCompat.Body2" + android:textAppearance="?attr/textAppearanceBody2" ... /> </com.google.android.material.card.MaterialCardView> 自定义
我们还可以选择在应用程序主题中覆盖类型比例，以使用自定义字体系列，XML或通过Android Studio 下载字体：
<!-- Copyright 2020 Google LLC. SPDX-License-Identifier: Apache-2.0 --> <style parent="Theme.MaterialComponents.*"> ... + <item>@style/TextAppearance.App.Headline6</item> + <item>@style/TextAppearance.App.Body2</item> </style> +<style + parent="TextAppearance.MaterialComponents.Headline6"> + <item>@font/roboto_mono_medium</item> +</style> +<style + parent="TextAppearance.MaterialComponents.Body2"> + <item>@font/roboto_mono_regular</item> +</style>上面我们只是重写了 13 种类型中的一种。如果你想要改变字体的话，建议也把剩余的 12 修改了，以保持APP中字体的一致性。
ShapeShapeAppearance styles/attributes
Shape（ Material Design shape system） 是用来处理 MDC 控件的边角的一种方式，分成了小，中，大
这些合适的样式属性来自 ShapeAppearance.* styles。包括：cornerFamily （两种值：rounded cut） 。用 cornerSize 来表示尺寸