Vertical smooth scrolling of values in a text view

I have a text view where in i have to keep ages between 1-99. I also have two buttons ^ and v(i mean up and down arrows) on clicking them the values of the age should smoothly scroll to next or previous value.

I have been tryin开发者_如何学运维g different ways but couldnt achieve smooth scrolling. Can anyone please give me any idea of how to achieve the task.

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I think the easiest way is to simply put the TextView within a ScrollView, and let the arrows interact with the ScrollView, by using things like the fling method and playing around with the velocity parameter to suit your needs.

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Use the animation framework.

When pressing down, start the 'down'-animation. When pressing up, start the 'up'-animation.

Read more about animation here: http://developerlife.com/tutorials/?p=343

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View animation is not much matured and hence i am noy sure if that can be used for moving the views.

Please find the description below:

Another disadvantage of the view animation system is that it only modified where the View was drawn, and not the actual View itself. For instance, if you animated a button to move across the screen, the button draws correctly, but the actual location where you can click the button does not change, so you have to implement your own logic to handle this.

Source

To scroll smoothly you can try using the scroller component.

Reference

What you would need to do is pass the duration of the scroll in the constructor and then use the property

setFinalY(int newY) to increment the counter position by 1 unit (equal to the height of the item).

Please let me know if that helps!