https://blog.csdn.net/u012702547/article/details/50932090

title颜色设置，参考：
https://blog.csdn.net/yhxsin111/article/details/49022119?locationNum=2

https://www.jianshu.com/p/c6ca571802d7

以下代码写在这个位置：res ——values——styles.xml

<resources>
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <!--状态栏颜色-->
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <!--控制各个控件被选中时的颜色-->
        <item name="colorAccent">@color/colorAccent</item>
        <item name="android:homeAsUpIndicator">@color/colorAccent</item>
        <item name="actionBarStyle">@style/BlackTitle</item>
    </style>

    <style name="BlackTitle" parent="@style/Widget.AppCompat.ActionBar.Solid">
        <item name="titleTextStyle">@style/BlackTitleStyle</item>
        <item name="elevation">1dp</item>
    </style>
    <style name="BlackTitleStyle" parent="@style/TextAppearance.AppCompat.Widget.ActionBar.Title">
        <item name="android:textColor">@color/black</item>
    </style>
    </resources>