http://blog.csdn.net/yingtian648/article/details/52432438(转载)

1.在Toolbar.xml中设置弹出菜单的风格(app:popupTheme =@style/OverflowMenuStyle)

  toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
android:background  设置ToolBar背景色
android:titleTextColor 设置字体颜色
app:navigationIcon 设置左边按钮图标
app:popupTheme 设置弹出菜单的风格
-->
<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="?attr/actionBarSize"
     android:background="?attr/colorPrimary"
     app:navigationIcon="@drawable/back"
     android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
     app:popupTheme="@style/OverflowMenuStyle"
     >
</android.support.v7.widget.Toolbar>
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