My application layout is like this:
Please click to see this image
the blue area is my content, 4096px. the red frame is a phone screen which is a HorizontalScrollView.
My layout is like this:
<HorizontalScrollView>
<ChartContent>
</ChartContent>
</HorizontalScrollView>
when the HorizontalScrollView (I will call it HSV for convenient) is scrolling to the end of the content area. I will make it scrollTo the beginning of the content area, and redraw chart in my content area. That will make the user feel it is like a endless scrollview.
I follow this post : Synchronise ScrollView scroll positions - android. Inherit the horizontalScrollView class and override the onScrollChanged method so I can get the current x of the HSV.
Log like this:
it means the red frame is moving from left to right (oldx -> x)
onScrollChanged: 1006 -> 1180, speed = 174
onScrollChanged: 1006 -> 1180, speed = 174
onScrollChanged: 1180 -> 1254, speed = 74
onScrollChanged: 1180 -> 1254, speed = 74
onScrollChanged: 1254 -> 1325, speed = 71
onScrollChanged: 1254 -> 1325, speed = 71
onScrollChanged: 1325 -> 1366, speed = 41
onScrollChanged: 1325 -> 1366, speed = 41
onScrollChanged: 1366 -> 1406, speed = 40
onScrollChanged: 1366 -> 1406, speed = 40
onScrollChanged: 1406 -> 1449, speed = 43
onScrollChanged: 1406 -> 1449, speed = 43
onScrollChanged: 1449 -> 1499, speed = 50
onScrollChanged: 1449 -> 1499, speed = 50
onScrollChanged: 1499 -> 1518, speed = 19
onScrollChanged: 1499 -> 1518, speed = 19
onScrollChanged: 1518 -> 1544, speed = 26
but when I call scrollTo inside onScrollChanged:
call HSV.scrollTo(60)
Log:
onScrollChanged: 3708 -> 60, speed = -3648 —> ok
onScrollChanged: 3579 -> 60, speed = -3519 —> ok
onScrollChanged: 60 -> 3738, speed = 3678 —> wrong
onScrollChanged: 3738 -> 60, speed = -3678 —> wrong
onScrollChanged: 60 -> 60, speed = 0 —> wrong
the Line 3 - 5 is very confusing, and the HSV will suddenly stop at position x = 60.
Is there something wrong with my implementation? Or can I use other solution achieve my goal?