toolbar字体大小修改

http://stackoverflow.com/questions/28487312/how-to-change-the-toolbar-text-size-in-android?newreg=6f9961ec5d204fbe876edf7993b152fc

Use titleTextAppearance:

<android.support.v7.widget.Toolbar    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:layout_width="match_parent"    android:layout_height="?actionBarSize"    android:id="@+id/toolbar"    app:titleTextAppearance="@style/Toolbar.TitleText" />

and override the default title size in a custom style:

<style name="Toolbar.TitleText" parent="TextAppearance.Widget.AppCompat.Toolbar.Title">    <item name="android:textSize">18sp</item></style>