How to set blocking of actions while the application is running, android?

Question

Android

The essence of the problem is the following. I am making a simple media player for a child, I want him to be able to use only the internal content of the application, without the possibility of accessing the launcher.
To do this, you need to somehow block the buttons and the display (for example, when the video will be played).
The search did not bring results. Or am I looking in the wrong place.
With pleasure I will read about how to implement it or where to study.
Thanks in advance!

Answer 1

Read the material at these links. I think you will find the answer to your question.
Good luck! And may the force be with you! =)
developer.alexanderklimov.ru/android/keyboard.php
How to intercept pressing the hardware Home button?
stackoverflow.com/questions/17549478/how-to-disabl...
https://github.com/shaobin0604/Android-HomeKey-Loc...
https://github.com/shaobin0604/Android-HomeKey-Loc. ..
https://github.com/shaobin0604/Android-HomeKey-Locker
developer.android.com/reference/android/view/KeyEv...
en.stackoverflow.com/questions/322836/%D0%9F%D0% B5...

Answer 2

One more question. I dug around, everything turned out except for the on / off button, and something tells me that it will not work to programmatically lock this button. Is it so?