Make ActionBar title uppercase

问题

How do I make the ActionBar title uppercase? Some answers suggest putting <item name="android:textAllCaps">true</item> but this has no effect when I put it in the actionBar style or actionBar's titleTextStyle. It only has an effect when I put in in the AppTheme style but that makes a bunch of things in my app also in all caps which I don't want.

My styles:

<style name="AppTheme" parent="AppBaseTheme">
    <!-- snip snip -->
    <item name="android:actionBarStyle">@style/NewActionBar</item>
</style>

<style name="NewActionBar" parent="@style/Widget.AppCompat.ActionBar">
    <item name="android:background">@color/text_pink</item> <!-- no effect -->
    <item name="android:titleTextStyle">@style/NewActionBarTitle</item>
    <item name="android:displayOptions">showHome|showTitle</item>
    <item name="android:textAllCaps">true</item> <!-- no effect -->
</style>

<style name="NewActionBarTitle">
    <item name="android:textSize">@dimen/tiny_text_size</item> <!-- no effect -->
    <item name="android:textAllCaps">true</item> <!-- no effect -->
</style>

And why do the NewActionBar and NewActionBarTitle styles appear to have no effect no matter what I put in them? Is there something wrong with my styles or my action bar or what?

Edit: I've just deleted entirely the styles NewActionBar and NewActionBarTitle (and the reference to them in the AppTheme style) and the action bar looks completely the same. So something is broken. What could it be?

回答1:

You need to set android:textAllCaps="true" on the text appearance for the action bar's title, rather than the action bar style itself or on your base activity theme.

<style name="AppTheme" parent="AppBaseTheme">
    ...
    <item name="actionBarStyle">@style/Widget.MyApp.ActionBar.Solid</item>
</style>

<style name="Widget.MyApp.ActionBar.Solid"
       parent="Widget.AppCompat.ActionBar.Solid">
    <item name="titleTextStyle">@style/TextAppearance.MyApp.Widget.ActionBar.Title</item>
</style>

<style name="TextAppearance.MyApp.Widget.ActionBar.Title"
       parent="TextAppearance.AppCompat.Widget.ActionBar.Title">
    <item name="android:textAllCaps">true</item>
</style>

来源：https://stackoverflow.com/questions/29333139/make-actionbar-title-uppercase