Android Question Avoid the app to exit when swiped from right to left

Mattiaf · Nov 27, 2022

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 easier to use it.
So in order to go back, for any app, I swipe from the left side to the center of the screen.
This makes the app to exit. I found online some solutions but they only works for the back button, and in this case i'm not pressing any back button.
Is there a way to fix it?

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean
  Select KeyCode
  Case KeyCodes.KEYCODE_BACK
      
       Return true
  End Select
End Sub

this code obviously doesn't work

Erel · Nov 28, 2022

Add Log(KeyCode) to this sub. Do you see any message in the logs?

Mattiaf · Nov 28, 2022

Erel said:
Add Log(KeyCode) to this sub. Do you see any message in the logs?

If you mean something like this

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean
    Select KeyCode
        Case KeyCodes.KEYCODE_BACK
             Log(KeyCode)
            Return True
    End Select
End Sub

then no log appear

Brian Dean · Nov 28, 2022

You are logging the keycode in the wrong place. What Erel means is ...

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean
    Log(Keycode)                    ' <=== Here is where you see the keycode
    Select KeyCode
        Case KeyCodes.KEYCODE_BACK
            Return True
    End Select
End Sub

teddybear · Nov 28, 2022

Mattiaf said:
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 easier to use it.
So in order to go back, for any app, I swipe from the left side to the center of the screen.
This makes the app to exit. I found online some solutions but they only works for the back button, and in this case i'm not pressing any back button.
Is there a way to fix it?

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean Select KeyCode Case KeyCodes.KEYCODE_BACK Return true End Select End Sub

this code obviously doesn't work

I don't think you can get any KeyCode, cause you did not press any key, just touched screen. you should check what you do in event swiped

Mattiaf · Nov 28, 2022

Brian Dean said:
You are logging the keycode in the wrong place. What Erel means is ...

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean Log(Keycode) ' <=== Here is where you see the keycode Select KeyCode Case KeyCodes.KEYCODE_BACK Return True End Select End Sub

no log again. @teddybear is right, I am not pressing any keycode, i'm just touching the screen. @Erel do you think is there a work around? Thanks

teddybear · Nov 29, 2022

You should find out the reason that cause the app exit, is it crashed or activity_pause? do you have a touch event?

Erel · Nov 29, 2022

I guess that this swipe is equivalent to the "recent apps" button and not the back key. This means that it cannot be intercepted.

Mattiaf · Nov 29, 2022

Erel said:
I guess that this swipe is equivalent to the "recent apps" button and not the back key. This means that it cannot be intercepted.

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+

Erel · Nov 30, 2022

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.

Mattiaf · Nov 30, 2022

Erel said:
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.

Have you ever personally tried it using the swipe gesture?
this code doesn't show any log..

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean
    Log(Keycode)                  
    Select KeyCode
        Case KeyCodes.KEYCODE_BACK
            Return True
    End Select
End Sub

but trying with

B4X:

Private Sub B4XPage_CloseRequest As ResumableSub
    Log("closing")
End Sub

i get

B4X:

Logger connected to:  samsung SM-G985F
--------- beginning of main
** Activity (main) Create, isFirst = true **
Call B4XPages.GetManager.LogEvents = True to enable logging B4XPages events.
** Activity (main) Resume **
*** Service (firebasemessaging) Create ***
** Service (firebasemessaging) Start **
closed
Error occurred on line: 476 (B4XPagesManager)
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.Boolean.booleanValue()' on a null object reference
    at Chiavii.ronda.b4xpagesmanager$ResumableSub_HandleCloseRequest.resume(b4xpagesmanager.java:858)
    at anywheresoftware.b4a.shell.DebugResumableSub$DelegatableResumableSub.resumeAsUserSub(DebugResumableSub.java:48)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:146)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
    at anywheresoftware.b4a.shell.DebugResumableSub$DelegatableResumableSub.resume(DebugResumableSub.java:43)
    at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:267)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:139)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
    at anywheresoftware.b4a.keywords.Common$14.run(Common.java:1772)
    at android.os.Handler.handleCallback(Handler.java:942)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loopOnce(Looper.java:226)
    at android.os.Looper.loop(Looper.java:313)
    at android.app.ActivityThread.main(ActivityThread.java:8741)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)

any idea?

Erel · Dec 1, 2022

I don't see the "closing" message in the logs.

The code is wrong. Correct way to use B4XPage_CloseRequest: https://www.b4x.com/android/forum/t...or-managing-multiple-pages.118901/post-743793

teddybear · Dec 1, 2022

Erel said:
I don't see the "closing" message in the logs.

The code is wrong. Correct way to use B4XPage_CloseRequest: https://www.b4x.com/android/forum/t...or-managing-multiple-pages.118901/post-743793

https://www.b4x.com/android/forum/t...or-managing-multiple-pages.118901/post-743793
The code works fine in my App using gesture back.

Android Question Avoid the app to exit when swiped from right to left

Mattiaf

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Erel

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Mattiaf

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Brian Dean

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teddybear

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Mattiaf

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teddybear

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Erel

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Mattiaf

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Erel

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Mattiaf

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teddybear

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