Android Question Simulating Restart Activity

DawningTruth · Sep 21, 2019

My app needs to redraw certain elements upon a button press.

I have created an algorithm which requires the following steps:

B4X:

'Button Pressed
'Do some stuff
'Save Activity Data
'Restart Activity
'Redraw Based on Previous Activity Data

Some of the critical code is in Create and some of it is in Resume. So both need to be executed.

I have tried using:

B4X:

Activity_Pause

'Within Pause

Activity_Create

But it does not recreate the activity.

Any suggestions.

LucaMs · Sep 21, 2019

Use a your own sub like Sub Redraw, instead of trying to restart the activity (call Redraw also in Activity_Create, of course)

DawningTruth · Sep 21, 2019

LucaMs said:
Use a your own sub like Sub Redraw, instead of trying to restart the activity (call Redraw also in Activity_Create, of course)

Thx LucasMS.

The nature of the views used requires a redraw. I already have the code that does what is required for the screen change orientation.

So in this case I basically need to trigger some sort of configuration change event, which mimics the Activity Lifecycle of a Screen Orientation Change i.e. Pause -> Create -> Resume

Semen Matusovskiy · Sep 21, 2019

Guess, you want

B4X:

    Dim javaobjectInstance                                                      As JavaObject

    javaobjectInstance.InitializeContext
    javaobjectInstance.RunMethod ("recreate", Null)

https://developer.android.com/reference/android/app/Activity

recreate()
Cause this Activity to be recreated with a new instance.

DawningTruth · Sep 21, 2019

Semen Matusovskiy said:
Guess, you want

B4X:

Dim javaobjectInstance As JavaObject javaobjectInstance.InitializeContext javaobjectInstance.RunMethod ("recreate", Null)

https://developer.android.com/reference/android/app/Activity

recreate()
Cause this Activity to be recreated with a new instance.

Thx Semen

Jack Cole · Sep 21, 2019

Semens approach is elegant.

I've done it before manually by just doing what the app already does when creating the activity. You have to remove all the views, and execute the subs that declare the variables (to reset them).

B4X:

Sub Restart
     Activity.RemoveAllViews
     Process_Globals
     Globals
     Activity_Create(True)
     Activity_Resume
End Sub

DawningTruth · Sep 21, 2019

Jack Cole said:
Semens approach is elegant.

I've done it before manually by just doing what the app already does when creating the activity. You have to remove all the views, and execute the subs that declare the variables (to reset them).

B4X:

Sub Restart Activity.RemoveAllViews Process_Globals Globals Activity_Create(True) Activity_Resume End Sub

Thx Jake, interesting alternative approach ;-)

Erel · Sep 22, 2019

If you need to recreate the activity then your program is not structured ideally.
Best option is to rethink its structure.

You can restart it with:

B4X:

Activity.Finish
StartActivity(Me)

DawningTruth · Sep 22, 2019

Erel said:
If you need to recreate the activity then your program is not structured ideally.
Best option is to rethink its structure.

You can restart it with:

B4X:

Activity.Finish StartActivity(Me)

Thx Erel. I do agree with you. Am investigating an alternative.

Android Question Simulating Restart Activity

DawningTruth

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