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You only can react in an activity when the activity goes to the background. You can not intercept the backkey or home key.
link: How can I intercept the back key in a running service in the background to start an action? Thank you

Only now I understand why you wrote Activity_KeyPress. You should say "back key". The back key is handled in B4XPage_CloseRequest: https://www.b4x.com/android/forum/threads/b4x-b4xpages-cross-platform-and-simple-framework-for-managing-multiple-pages.118901/post-744867
link: i already tried this, but how can i use this by pressing the back key (Activity_Keypress)?

Oh, yes! You are right! Back key is the UserClosed = True. The real question is how to detect the closing from task manager within B4XPages!!!
link: UserClosed parameter from Activity_Paused has nothing to do with the task manager. It is true when the user clicks on the back key.

'Handle the back key (see the example project for B4XPages implementation) Sub Activity_KeyPress (KeyCode As Int) As Boolean 'Return True to consume the event If KeyCode = KeyCodes.KEYCODE_BACK Then If prefdialog.BackKeyPressed Then Return True End If Return False End Sub 'Handle ke

we're talking about the same key. when the keyboard is down, the "back" key points "back". when the keyboard is up, the "back" key points "down". some key, different function (depending on whether it's pointing back or down). you got 2 "back" keys? just askin', but why would somebody have 2 bac
link: > when you tap the back key on a keyboard, it's supposed to go down. And it will. I am talking about the back key of the Android bar at the bottom (r
link: > when you tap the back key on a keyboard, it's supposed to go down. This line is causing some confusion. What key (on the Android keyboard) are you
link: i think you should determine the value (or key code) of your keyboard "back" key. don't you define these things when creating your custom view? how

Tip: switch to B4XPages and everything will be simpler. In non-B4XPages the back button destroys the current activity and the home button pauses the activity and shows the home screen. In B4XPages the back button hides the current page. Pages are never paused or destroyed. The home button moves the
link: I tried this code to prevent back key from closing app: Sub B4XPage_CloseRequest As ResumableSub Return False End Sub But got this error: Err
link: What do exactly the Back key and the Home key on the device in B4A Close app ? Close activity ? I don't understand exactly when i read thé guides Tha

You need to handle the back key in the _KeyPress Event Sub Activity_KeyPress (KeyCode As Int) As Boolean ... End Sub there you check the KeyCode and return true to not close the activity and also put the dialog hide command something like this Sub Activity_KeyPress (KeyCode As Int) As Boolean
link: Hi, How can I handle pressing back when the ProgressDialogShow2("Some text",True) is shown? in the example below, I want to change it to : Progre

It takes to the home screen when the current page is the only page in the pages stack.
link: Firstly B4xPage back key works fine in mobile phone,. but with emulator and TVset, it seems to be unnormal, I start an app from my application screen,
link: Thanks, but it doesn't take to the home screen in cell phone even though the current page is the only page.

The back key raises this event. This is the way to intercept it. It is unlikely to work but see whether the B4XPage_CloseRequest event is raised when you swipe.
link: I guess that this swipe is equivalent to the "recent apps" button and not the back key. This means that it cannot be intercepted.
link: Hi, on my phone I don't have the bar in the bottom with the back button, home etc. I remove it and I'm just using the swipe gestures cause i find it e
link: I might be wrong but this swipe is not equivalent to the recent apps, it just works as back button.. At least, that does that for me on my galaxy s20+

It is dangerous to handle the Back Key with the Activity_KeyPress event in a libGdx game because all events are supposed to be seen and processed by the libGDX engine. You can have unexplained crashes when leaving a screen or an app by doing that as libGDX was not able to perform some internal opera
link: if Not(UserClosed) then ... you can check if the user closed that activity and not an incoming call or an ad... you can also catch the Back key (sub
link: thanx @Informatix, until today i used the backkey to exit my libgx game activity and i had never a crash report but i will definitely use your suggest

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