如果你想样式的字幕，然后简单地添加这在您的自定义样式。

<item name="android:subtitleTextStyle">@style/MyTheme.ActionBar.TitleTextStyle</item>

如果有人想在AppCompat库中得到同样的结果，那么这就是我所使用的:

<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="CustomActivityTheme" parent="@style/Theme.AppCompat.Light.DarkActionBar">
        <item name="android:actionBarStyle">@style/MyActionBar</item>
        <item name="actionBarStyle">@style/MyActionBar</item>
        <!-- other activity and action bar styles here -->
    </style>

    <!-- style for the action bar backgrounds -->
    <style name="MyActionBar" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="android:background">@drawable/actionbar_background</item>
        <item name="background">@drawable/actionbar_background</item>
        <item name="android:titleTextStyle">@style/MyTheme.ActionBar.TitleTextStyle</item>
        <item name="android:subtitleTextStyle">@style/MyTheme.ActionBar.TitleTextStyle</item>
        <item name="titleTextStyle">@style/MyTheme.ActionBar.TitleTextStyle</item>
        <item name="subtitleTextStyle">@style/MyTheme.ActionBar.TitleTextStyle</item>
     </style>
    <style name="MyTheme.ActionBar.TitleTextStyle" parent="@style/TextAppearance.AppCompat.Widget.ActionBar.Title">
        <item name="android:textColor">@color/color_title</item>
      </style>
</resources>

这不是推荐的解决方案，因为我要在这里的android api，但作为我的应用程序需要在条件上动态改变主题xml不可能在这里，所以我需要这样做。但是这个解决方法很有效。

解决方案:——

 /**
 * 
 * @author Kailash Dabhi
 * @email kailash09dabhi@gmail.com
 *
 */ 
 public static void setActionbarTextColor(Activity activity, int color) {
    Field mActionViewField;
    try {
        mActionViewField = activity.getActionBar().getClass()
                .getDeclaredField("mActionView");
        mActionViewField.setAccessible(true);
        Object mActionViewObj = mActionViewField.get(activity
                .getActionBar());

        Field mTitleViewField = mActionViewObj.getClass().getDeclaredField(
                "mTitleView");
        mTitleViewField.setAccessible(true);
        Object mTitleViewObj = mTitleViewField.get(mActionViewObj);

        TextView mActionBarTitle = (TextView) mTitleViewObj;
        mActionBarTitle.setTextColor(color);
        // Log.i("field", mActionViewObj.getClass().getName());
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    }

}

这是一个老话题，但对于未来的读者来说，使用工具栏使一切变得非常简单:

Toolbar toolbar = (Toolbar) findViewById(R.id.tool_bar);
toolbar.setTitle(R.string.app_name);
toolbar.setTitleTextColor(getResources().getColor(R.color.someColor));
setSupportActionBar(toolbar);

<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]

最直接的方法是在styles.xml中完成。

谷歌的模板styles.xml当前生成以下内容:

<style name="AppTheme" parent="Theme.AppCompat.Light">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

如果你在结束标签之前再添加一行，如图所示，这将改变文本的颜色，使其与Dark ActionBar相同:

<style name="AppTheme" parent="Theme.AppCompat.Light">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="actionBarTheme">@style/ThemeOverlay.AppCompat.Dark.ActionBar</item>
</style>

如果你想自定义颜色为其他东西，你可以在colors.xml中指定自己的颜色，甚至使用Android的内置颜色使用Android:textColorPrimary属性:

<style name="AppTheme" parent="Theme.AppCompat.Light">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="actionBarTheme">@style/AppTheme.AppBarOverlay</item>
</style>


<style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar">
    <item name="android:textColorPrimary">@android:color/darker_gray</item>
</style>

注意:这将改变标题的颜色，以及在动作栏中显示的任何菜单项的标题。

对于Android 5(棒棒糖)，你必须使用Android:actionBarPopupTheme来设置溢出菜单的textColor。