Unable to set ScrollPosition in Sub Activity_Create

Pantelis · May 27, 2013

Hi

I am trying to set the Scrollposition property of one HorizontalScrollView with the code:: LongLayout.ScrollPosition = 700
If i put the code in a sub event of a button like button1_click it works ok.
But if i put the same code just before the end of "Sub Activity_Create" nothing happens. The ScrollView remains in its original scroll position.
Setting another property like "LongLayout.Height = 300" work ok on "Sub Activity_Create"
Why this happens?

Thanks

Erel · May 28, 2013

This happens because the HorizontalScrollView smoothly scrolls to the position. You should change your code to:

B4X:

LongLayout.ScrollPosition = 700
DoEvents
LongLayout.ScrollPosition = 700
DoEvents

Note that this code is also wrong. You should use 700dip.

Pantelis · May 28, 2013

Thank you Erel. The code must be writen twice as in your example?

Erel · May 30, 2013

If I remember correctly it needs to be set twice.

GGSoft · Jun 27, 2017

Erel said:
This happens because the HorizontalScrollView smoothly scrolls to the position. You should change your code to:

B4X:

LongLayout.ScrollPosition = 700 DoEvents LongLayout.ScrollPosition = 700 DoEvents

So far I have used this "technique". Is it still valid?

klaus · Jun 27, 2017

Is it still valid?

Yes for B4A til version 6.80

Since version 7.00, try to use use this:

B4X:

Sleep(0)
LongLayout.ScrollPosition = 700dip

At least it works with the ScrollView.

Unable to set ScrollPosition in Sub Activity_Create

Pantelis

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Erel

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Pantelis

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Erel

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GGSoft

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klaus

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Unable to set ScrollPosition in Sub Activity_Create

Pantelis

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Erel

B4X founder

Pantelis

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Erel

B4X founder

GGSoft

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klaus

Expert

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