Android开发显示头部Bar

需求：

显示如下图：

显示头部Bar，颜色也能自定义。

解决方案

这个修改是在如下三个文件里进行修改：

按顺序修改：

themes.xml(night):

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Base.Theme.CropIrrigation" parent="Theme.MaterialComponents.Light.DarkActionBar">
        <!-- Customize your dark theme here. -->
         <item name="colorPrimary">@color/my_dark_primary</item>
    </style>
</resources>

themes.xml:

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Base.Theme.CropIrrigation" parent="Theme.MaterialComponents.Light.DarkActionBar">
        <!-- Customize your light theme here. -->
        <!-- <item name="colorPrimary">@color/my_light_primary</item> -->
        <!-- Customize your light theme here. -->
        <item name="colorPrimary">@color/myBarColor</item>.
        <item name="titleTextColor">@color/myBarColor</item>
    </style>

    <style name="Theme.CropIrrigation" parent="Base.Theme.CropIrrigation" />
</resources>

colors.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="black">#FF000000</color>
    <color name="white">#FFFFFFFF</color>
    <color name="myBarColor">#673AB7</color>
    <color name="my_dark_primary">#673AB7</color>
    <color name="titleColor">#E3D9D9</color>
    <color name="colorPrimary">#03A9F4</color>
</resources>

在主题文件**themes.xml:中，起作用的就是 Theme.MaterialComponents.Light.DarkActionBar,在属性文件colors.xml:**中起作用的就是 <color name="colorPrimary">#03A9F4</color>,<color name="my_dark_primary">#673AB7</color>