好吧，我找到了一个更好的办法。我现在只能改变标题的颜色。你也可以调整副标题。

下面是我的styles.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <style name="MyTheme" parent="@android:style/Theme.Holo.Light">
    <item name="android:actionBarStyle">@style/MyTheme.ActionBarStyle</item>
  </style>

  <style name="MyTheme.ActionBarStyle" parent="@android:style/Widget.Holo.Light.ActionBar">
    <item name="android:titleTextStyle">@style/MyTheme.ActionBar.TitleTextStyle</item>
  </style>

  <style name="MyTheme.ActionBar.TitleTextStyle" parent="@android:style/TextAppearance.Holo.Widget.ActionBar.Title">
    <item name="android:textColor">@color/red</item>
  </style>
</resources>

我已经用简单的一行代码完成了

actionBar.setTitle(Html.fromHtml("<font color='#ff0000'>ActionBartitle </font>"));

如果您正在使用自定义操作栏，您可以使用这些属性:

app:titleTextColor="@color/...."
app:subtitleTextColor="@color/...." 

或者用这样的方法:

setTitleTextColor()

欲了解更多属性，请查看此链接

这是我检查所有答案后使用的解决方案

<!-- Base application theme. -->
<style name="AppTheme" parent="@style/Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorAccent">@color/Button_color</item>
    <item name="android:editTextStyle">@style/EditTextStyle</item>
    <item name="android:typeface">monospace</item>
    <item name="android:windowActionBar">true</item>
    <item name="colorPrimary">@color/Title_Bar_Color</item>
    <item name="android:actionBarStyle">@style/Widget.Styled.ActionBar</item>
    <item name="actionBarStyle">@style/Widget.Styled.ActionBar</item>

</style>

<style name="EditTextStyle" parent="Widget.AppCompat.EditText"/>

<style name="Widget.Styled.ActionBar" parent="@style/Widget.AppCompat.Light.ActionBar">
    <item name="titleTextStyle">@style/ActionBarTitleText</item>
    <item name="android:background">@color/Title_Bar_Color</item>
    <item name="background">@color/Title_Bar_Color</item>
    <item name="subtitleTextStyle">@style/ActionBarSubTitleText</item>
</style>

<style name="ActionBarTitleText" parent="@style/TextAppearance.AppCompat.Widget.ActionBar.Title">
    <item name="android:textColor">@color/solid_white</item>
    <item name="android:textSize">12sp</item>
</style>

<style name="ActionBarSubTitleText" parent="@style/TextAppearance.AppCompat.Widget.ActionBar.Subtitle">
    <item name="android:textColor">@color/solid_white</item>
    <item name="android:textSize">12sp</item>
</style>

改变所需的颜色就可以了

就我而言，我切换到AndroidX工具栏，而不是使用本机操作栏。此外，我依赖于视图绑定从活动访问工具栏，但您可以使用findViewById(…)。

(我删除了不相关的代码)。

styles.xml:

...
<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
  ...
</style>
...

activity_main.xml:

...
<androidx.appcompat.widget.Toolbar
  android:id="@+id/toolbarMain"
  android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
  app:titleTextColor="@color/colorOnPrimary"
  ...
/>
...

MainActivity.kt:

class MainActivity : AppCompatActivity() {

  private lateinit var binding: ActivityMainBinding
  ...

  override fun onCreate(savedInstanceState: Bundle?) {
    ...
    binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
    setSupportActionBar(binding.toolbarMain)
    ...
  }

  ...
}

<android.support.v7.widget.Toolbar
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:id="@+id/toolbar"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="@color/color_primary"
  android:theme="@style/GalaxyZooThemeToolbarDarkOverflow"
  app:popupTheme="@style/Theme.AppCompat.NoActionBar" />


<style name="GalaxyZooThemeToolbarDarkOverflow" parent="Theme.AppCompat.NoActionBar">
  <!-- android:textColorPrimary is the  color of the title text
       in the Toolbar, in the Theme.AppCompat theme:  -->
  <item name="android:textColorPrimary">@color/abc_primary_text_material_light</item>
 
  <!-- android:textColorPrimaryInverse is the  color of the title
       text in the Toolbar, in the Theme.AppCompat.Light theme:  -->
  <!-- <item name="android:textColorPrimaryInverse">@color/abc_primary_text_material_light</item> -->
 
  <!-- android:actionMenuTextColor is the color of the text of
        action (menu) items in the Toolbar, at least in the
        Theme.AppCompat theme.
        For some reason, they already get the textColorPrimary
        when running on API 21, but not on older versions of
        Android, so this is only necessary to support older
        Android versions.-->
        <item name="actionMenuTextColor">@color/abc_primary_text_material_light</item>
  <!-- android:textColorSecondary is the color of the menu
       overflow icon (three vertical dots) -->
  <item name="android:textColorSecondary">@color/abc_secondary_text_material_light</item>
 
  <!-- This would set the toolbar's background color,
        but setting this also changes the popup menu's background,
        even if we define popupTheme for our <Toolbar> -->
  <!-- <item name="android:background">@color/color_primary</item> -->
</style>


**Reference:**
[https://www.murrayc.com/permalink/2014/10/28/android-changing-the-toolbars-text-color-and-overflow-icon-color/][1]