sheishuoAPP/app/res/values-v21/styles-activity.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="AppTheme.NoActionBar" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="android:colorPrimaryDark">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorPrimary</item>
        <item name="android:colorForeground">@color/black</item>
        <item name="android:navigationBarColor">@android:color/background_dark</item>
    </style>
</resources>