How to start an action with volume buttons?

I use an app (a manga reader) that have a nice feature: you can turn pages by pressing the volume buttons.
Is there any way to link an action to the pression of the volume button?
Like “if volume + pressed then show text…” or any other action.


This is the best source for extensions, and I don’t see one that does what you want. I may build one if I have time this weekend.

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I have searched about this…
Not clearly but on summary I found somewhere something like this The accessibility functions can’t be handled here

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