Android Question [SOLVED] Clear Activity Stack

Emme Developer · Jul 31, 2017

Hi everybody! Is possible to clear activity stack?
I've an application in which for some reason i can't call Activity finish in one activity, so when i press one button in 2nd activity i want to close also previous acitivity.
I have 2 option, call Activity.finish in previous act by using a simple CallSubDelayed, or using this code
https://stackoverflow.com/questions/7075349/android-clear-activity-stack

I tried to do 2nd option in this way, but doesn't work.. anyone can help me? Thanks

B4X:

Dim inte As Intent
        inte.Initialize(Me,"")
        Dim ob As JavaObject = inte
        inte.Flags = Bit.Xor(ob.GetField("FLAG_ACTIVITY_NEW_TASK"),ob.GetField("FLAG_ACTIVITY_CLEAR_TASK"))
        Activity.Finish      
        StartActivity(inte)

'Also tried
        Dim inte As Intent
        inte.Initialize(Me,"")
        Dim ob As JavaObject = inte
        ob.RunMethod("addFlags",Array(ob.GetField("FLAG_ACTIVITY_NEW_TASK")))
        ob.RunMethod("addFlags",Array(ob.GetField("FLAG_ACTIVITY_CLEAR_TASK")))
        Activity.Finish      
        StartActivity(ob)

'.... and ....

Dim inte As Intent
        inte.Initialize(main,"")
        Dim ob As JavaObject = inte
        ob.RunMethod("addFlags",Array(ob.GetField("FLAG_ACTIVITY_NEW_TASK")))
        ob.RunMethod("addFlags",Array(ob.GetField("FLAG_ACTIVITY_CLEAR_TASK")))
        Activity.Finish      
        StartActivity(inte)

Thanks!

DonManfred · Jul 31, 2017

Call this in a activity 1 to go to 2nd activity and do not want to come back...

B4X:

 Activity.Finish     
StartActivity(secondactivity)

Emme Developer · Jul 31, 2017

DonManfred said:
Call this in a activity 1 to go to 2nd activity and do not want to come back...

B4X:

Activity.Finish StartActivity(secondactivity)

Hi DonManfred, thanks for your answer.
As i said, i can't call Activity.finish in 1st actitiy.
I have 3 activity, Main, A and B.

From Main i will go to A. From A i will go to B (in a i can't call Activity finish). In B i want to go to Main and clear also A

DonManfred · Jul 31, 2017

Emme Developer said:
in a i can't call Activity finish

Why?

Emme Developer · Jul 31, 2017

DonManfred said:
Why?

Main activity is the first page in Application. A activity is a setting page. From Setting page i will go in a second Activity, B, that is language page. From B i want to change app language, so i reset some variables, close B activity, and return in Main.
I want that when an user click on back in setting page, will return in Main page. If i close activity before starting Language page, when user clicks on Back button in Language page will return on main page. But if i don't close Setting page, after that user goes in Main page, if clicks on back button then returns on Settings (with previous language setted). A solution is to set language in Activity_Resume in setting, but i thinks is easier clear activities stack.

Sorry for my english, i hope i clearly explain

Erel · Jul 31, 2017

Try this: https://www.b4x.com/android/forum/threads/clear-back-history.78129/#post-495126

Call finishAffinity and then start the next activity.

Emme Developer · Jul 31, 2017

Erel said:
Try this: https://www.b4x.com/android/forum/threads/clear-back-history.78129/#post-495126

Call finishAffinity and then start the next activity.

Many thanks, i didn't see it! Works

Android Question [SOLVED] Clear Activity Stack

Emme Developer

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DonManfred

Expert

Emme Developer

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DonManfred

Expert

Emme Developer

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Erel

B4X founder

Emme Developer

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Android Question [SOLVED] Clear Activity Stack

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