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Homer Player is an audiobook player for the elderly. Its simple user interface makes it easy to operate for seniors and people with poor vision (or both). It features simplicity so far you can even use it in "single application mode" (kiosk), to make the Android device a dedicated Audio Book Reader the user cannot "accidentally close and get lost on".
Single application mode (kiosk):
With this mode enabled the user cannot exit the application so they don't need to know how to use a tablet.
Perfect for building a dedicated audiobook player for your grandparents.
Let me know if you need help, like the app or hate it.