Comments on: Android Two-Dimensional ScrollView

By: Matt Clark

Matt Clark — Tue, 17 Jan 2012 14:25:46 +0000

Sarath, I’m not sure what to recommend, but my original code is a few years old and probably has been superceded by the Wasikuss reference. See if the StackOverflow solution mentioned above works for you. -Matt

By: sarath

sarath — Tue, 17 Jan 2012 04:40:19 +0000

Thanks Matt Clark s, i have used your code for implementing two dimensional dynamic table with edit texts which looks like a grid.Since my complete activity layout is very heavy.I have used scroll view as the parent of the activity and your custom two-D class for one part.But its working fine for horizontal but not working for the vertical.If I remove the parent scroll view of the activity,its working fine for both dimensions.Could please help in solving this?

By: Wasikuss

Wasikuss — Mon, 07 Nov 2011 10:42:34 +0000

simpliest way

http://stackoverflow.com/questions/3866499/two-directional-scroll-view/8035250#8035250

wasikuss

By: Matt Clark

Matt Clark — Fri, 23 Sep 2011 03:34:46 +0000

James, you probably uncovered a bug! The code is two years old and if the fill_parent works, then perhaps that code is not needed. Thanks for the feedback and posting. –Matt

By: James McMurray

James McMurray — Wed, 21 Sep 2011 14:56:56 +0000

Looks great! I was confused by the fact that it limits horizontal scrolling based on the child layout’s height but not vertical scrolling. I noticed in measureChildWithMargins you use different formulas for height and width.

final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, getPaddingLeft() + getPaddingRight() + lp.leftMargin + lp.rightMargin + widthUsed, lp.width);

final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED);

I changed it to use the same method for getting the width:

final int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(lp.leftMargin + lp.rightMargin, MeasureSpec.UNSPECIFIED);

The scrolling seems to work great in both directions without the need to specify a height or width (i.e. it looks good using fill_parent instead of xxx dip).

I’m curious what the original reason was for using different formulas, since I’d hate to break something with the change.

By: Lawrence D’Oliveiro

Lawrence D’Oliveiro — Mon, 15 Aug 2011 06:49:16 +0000

You can cut down the memory usage by only caching a bit beyond the visible part of the view. Then regenerate the cache in a background thread to match to the new scroll position.

Here’s some code for a two-dimensional scroller illustrating this technique:

https://github.com/ldo/view_cache_demo_android

By: Rob Brambley

Rob Brambley — Sat, 13 Aug 2011 20:00:11 +0000

Thanks so much… this saved me so much time. Awesome post.

By: HungDL

HungDL — Thu, 28 Jul 2011 00:28:59 +0000

i add a extends of View class into TwoDScrollView to draw images by canvas. But it cann’t draw anything, onDraw() event is’nt called!

If i use a FrameLayout to add that class, i can draw the images.

How can i use TwoDScrollView for my app?

By: Nasir

Nasir — Thu, 21 Jul 2011 10:15:58 +0000

I got it working.

By: Nasir

Nasir — Wed, 20 Jul 2011 13:48:08 +0000

can anyone tell me the steps how to get this TwoDScrollView working. I need horizontal and vertical scrolling for my GUI.