Change Talkback Language Dynamically?

I have an application with a translation quiz and I want to make it accessible to blind people. The problem is that when I focus on a Spanish sentence (for example), Talkback reads

Solution 1:

Yes there is now!

You have to wrap the string in a LocaleSpan (min sdk 17) and the latest version of TalkBack can switch language on the fly.

• What's new in Android Accessibility 2017 - https://youtu.be/h5rRNXzy1xo?t=11m
• https://developer.android.com/reference/android/text/style/LocaleSpan.html