Hide Home and Recent Button in Android App Programatically - java

I need to hide Buttons in the images
I need to hide Recent Button and Home Button if the My App is opened..
I have searched for so much codes. nothings seems to be working...
Please someone help me out.. Thanks in advance :)

Take a look at this topic, how to hide navigation bar, i think its that what u need
https://developer.android.com/training/system-ui/navigation

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