Android Question Infinite listview up and down

Erel

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• Aug 18, 2015

• #2

See this thread: https://www.b4x.com/android/forum/posts/210230/

 

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demasi

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• Aug 18, 2015

• #3

Thank you, Erel. I saw this, but i think this works for the end of the list. And how can I do the same for the top, when the list is moving down? I need to move two way.

 

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eurojam

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• Aug 18, 2015

• #4

Hi,
that is an interesting question, infinite items would need also infinite RAM, may be that will be a problem....?

 

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demasi

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• Aug 18, 2015

• #5

Its not really infinite. Maybe the best term should be "unknown" itens up or down. I will show years starting from current with some more data, and the user can go to the past or to the future in the list, a number of years, depending on his patience, and it could be 20, 100 or more than 1000 years. I managed to do this by using buttons for up and down, and regenerating the list for the range, 20 years, each press. But it would be much better and beaitiful to scroll the list with the finger as a normal listview.

 

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eurojam

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• Aug 18, 2015

• #6

May be a wheel view is the right thing for that:
https://www.b4x.com/android/forum/threads/wheelview-library.17028/
or
https://www.b4x.com/android/forum/threads/spin-wheel.14620/

 

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demasi

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• Aug 18, 2015

• #7

Wow! Fantastic! I will try this now. I think this view is exactly what I need. Thank you!

 

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demasi

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• Aug 19, 2015

• #8

These wheels are very nice. I need something like this. But I need to have the ability to insert itens at the beginning or at the end when the user moves down or up. I was looking at Klaus code, but it is beyond my understanding, because I don't understand java, things like reflector, etc.

 

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klaus

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• Aug 19, 2015

• #9

My wheels won't do it either.
They use limited lists.
For the 'continous scrolling' I add three times the list, instead of one time, to the wheel.
When the scrolling finishes in the first or third 'list' the wheel jumps to the middle list.

 

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johndb

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• Aug 19, 2015

• #10

demasi said:

These wheels are very nice. I need something like this. But I need to have the ability to insert itens at the beginning or at the end when the user moves down or up. I was looking at Klaus code, but it is beyond my understanding, because I don't understand java, things like reflector, etc.

Click to expand...

I would suggest that you have a look at the UltimateListView library https://www.b4x.com/android/forum/threads/lib-chargeable-ultimatelistview.22736/
I'm sure that It will do what you require.

 

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demasi

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• Aug 19, 2015

• #11

I already have this fantastic lib. I use a lot in my apps with my kids, in the school. I make quizes, tests, internal communications and a lot of material to help the classes.
But for this purpose, I can´t see how can I use it, because I need to insert itens "on the fly", up and down, up to a limit defined only by the user's need.
thank you.

 

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