Android ActionBar/Toolbar 颜色在浅色和深色主题中不同

Question

我想了解为什么 ActionBar 在 Light 与 Dark 主题中的样式不同。下面是一个简单的设置屏幕，可以在具有相同主题的浅色和深色主题之间切换。

值\主题.xml

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Dark application theme. -->
    <style name="Theme.SettingsApplication" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
        <item name="colorPrimary">@color/blue_normal</item>
        <item name="colorPrimaryVariant">@color/blue_dark</item>
        <item name="colorOnPrimary">@color/white</item>
        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
        <item name="colorSurface">@color/red</item>
        <item name="colorOnSurface">@color/green</item>
    </style>
</resources>

值夜\themes.xml

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Dark application theme. -->
    <style name="Theme.SettingsApplication" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
        <item name="colorPrimary">@color/blue_normal</item>
        <item name="colorPrimaryVariant">@color/blue_dark</item>
        <item name="colorOnPrimary">@color/white</item>
        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
        <item name="colorSurface">@color/red</item>
        <item name="colorOnSurface">@color/green</item>
    </style>
</resources>

值\颜色.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="blue_normal">#FF3F7FBF</color>
    <color name="blue_dark">#FF2F6090</color>
    <color name="white">#FFFFFFFF</color>
    <color name="red">#FF0000</color>
    <color name="green">#00FF00</color>
</resources>

在 Light them 中，ActionBar 显示为蓝色和白色，表明它正在使用 colorPrimary 和 colorOnPrimary。在 Dark 主题中，它显示为红色和绿色，表明它正在使用 colorSurface 和 colorOnSurface。为什么这些应用不同，我如何才能在 ActionBar 上获得一致的颜色应用？

Answer 1

Why are these applied differently

引自文档:

large surfaces should not use bright background colors because they can emit too much brightness. When applicable, the Material themes will provide this behavior out-of-the-box, e.g., by having the Light theme default to Widget.MaterialComponents.AppBarLayout.Primary and the Dark theme default to Widget.MaterialComponents.AppBarLayout.Surface.

因此，虽然浅色和深色主题的颜色相同，但 Primary 颜色是浅色模式下的首选颜色，而 surface 颜色是对于暗模式。

how can I get consistent application of colors on the ActionBar?

这可以从之前的文档中得出结论..

因此，您只需要让 values\themes.xml 包含:

1. colorPrimary 和 colorSurface 具有相同的值
2. colorOnPrimary 和 colorOnSurface 具有相同的值

将此应用于您的示例

values\themes.xml

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Dark application theme. -->
    <style name="Theme.SettingsApplication" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
        <item name="colorPrimary">@color/blue_normal</item>
        <item name="colorOnPrimary">@color/white</item>
        
        <item name="colorSurface">@color/blue_normal</item>
        <item name="colorOnSurface">@color/white</item>
    </style>
</resources>

了解更多请check documentation .