我发现在一些演示代码中有两种情况, ?android:attr/textAppearanceMedium 和 ?android:textAppearanceMedium 有什么区别?谢谢!
情况1
<resources>
<style name="myTextAppearance">
<item name="android:textAppearance">?android:attr/textAppearanceMedium</item>
</style>
案例2
<resources>
<style name="myTextAppearance">
<item name="android:textAppearance">?android:textAppearanceMedium</item>
</style>
</resources>