將style的改成：
<resources>

    <style name="AppTheme" parent="Base.AppTheme" type="text/css"><!-- Customize your theme here. --></style>
    <!-- Base application theme. -->
    <style name="Base.AppTheme" parent="Theme.AppCompat.Light.DarkActionBar" type="text/css">
        <item name="colorPrimary">#673AB7</item>
        <item name="colorPrimaryDark">#512DA8</item>
        <item name="colorAccent">#FF4081</item>
    </style>

</resources>


然後AndroidManifest中將Theme改成：

android:theme="@style/Base.AppTheme"