Question: I am a student programmer and the topic my degree work is to finalize one of the input methods for touchscreen devices by visually impaired people (including the blind).
I want to make my application work correct with TalkBack. But I totally don't know, how to do it. I've found the package for accessibility, but it's not clear for me, how to it integrates with TB.

Answer: 
You can start with simple layout with ImageView and add android:contentDescription="your string" as a parameter in xml. Then turn on talkback and click on that image to see what happens.
Use **android:contentDescription="Generic Image"** in any View with any custom content.

Note: When using ViewGroup, should be careful of clicking through view.

Here is a example: <https://github.com/dotrinhdev/AndroidTalkback>