styles.xml 文件中加上粗體代碼
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here.-->
<item name="colorPrimary">@color/title</item><!-- actionbar color-->
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item><!--登錄編輯框顏色-->
<!-- 更換右側actionbar圖標-->
<item name="android:actionOverflowButtonStyle">@style/OverflowStyle</item>
</style>
<style name="OverflowStyle">
<item name="android:src">@mipmap/setting</item>
</style>
</resources>