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Find position of ImageView relative to the image it's displaying

Answer 1

+1 A:

getTop() , getLeft() on the child view won't solve it ? And if views are not parent-child , but have same parent - do it for each view and do the math

Alex Volovoy 2010-01-07 18:20:29

Image isn't a view. It's an actual Bitmap, which is bigger than the ImageView.

F0RR 2010-01-07 19:54:49

But your bitmap does resides in some sort of layout right ? If you there is a frame layout where both of those are resided than getLeft() on imageview - padding you use for the Image should give you the x right ?

Alex Volovoy 2010-01-07 20:52:18

Err.... As far as I understand, image is just logically there. After you domImageLayout.setImageBitmap(mImage);

F0RR 2010-01-07 21:00:34

mImageLayout IS your layout. And it's seems to be an imageview itselftSo who the parent of the mImageLayout and ImageView ? If it's the same - just do mImageLayout.getLeft imageView.getLeft() and do the math

Alex Volovoy 2010-01-07 21:13:24

The way you drawn that - it's two image views inside RelativeLayout. One of them mImageLayout just happen to be set bitmap from code.

Alex Volovoy 2010-01-07 21:18:18

I updated the question to clear the misunderstanding.

F0RR 2010-01-08 09:45:06

If this is the case what's the purpose of that calculation - what you're trying to archive in the end ?

Alex Volovoy 2010-01-08 15:06:05

Well, I want to solve this problem: http://stackoverflow.com/questions/2015167/rich-image-scroll-and-zooming-on-androidIf I can find out / calculate realtive position of ImageView, then I can implement scrolling with scrollBy/scrollTo. Without it I can't tell, whether the image is leaving ImageView bounds.

F0RR 2010-01-08 16:47:51

Ah.. Yeah i'm not sure how to deal with that. I'd try to get rid of the scale type on the image view. Pre scale a bitmap myself by createScaledBitmap(src, dstWidth, dstHeight, filter) or createBitmap(params) - that way you know where you at relatively from original. Not sure if it's a right or efficient approach

Alex Volovoy 2010-01-08 17:08:56

Yeah... Looks more like voodoo than java. Still, thanks a bunch.

F0RR 2010-01-08 17:45:33

Not really a voodoo - if the goal to know relative x. If you prescale bitmap yourself by specifying start x,y from the source - mission accomplished. If you ask somebody else do it for you ( OS ) than you have to try to figure out those values - so i'd say take control from beginning.

Alex Volovoy 2010-01-08 18:08:56

Yep. Still it somehow fills like a should-be prebuilt feature...

F0RR 2010-01-08 18:25:52

Answer 2

A:

The image render starts from the top-left corner of the image so even if the image is bigger then the imageview, you will always see the top-left corner.

Funkyidol 2010-01-08 10:59:32

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Find position of ImageView relative to the image it's displaying

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