how to get radio button in each items recyclerview - android-studio

I was a little confused in this case, I saw different examples, but I did not see what I think is complete. If you have a better example for me in this case, thank you for helping me in this case so that I can solve this issue much better. To.
Thanks

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Creating a drawn audio reactive visual

I'm looking to create this project in processing, however, I'm finding the terminology a bit hard. I'm not sure how to call the effect where the line is staying permanently throughout the song to 'draw' the music data.
I would appreciate any guidance on what tutorials I could look at or an answer from someone.
My aim is to create something as close to this as possible:
https://www.youtube.com/watch?v=Bb5PTitqtlc&t=58s
Stack Overflow isn't really designed for general "how do I do this" type questions. It's for specific "I tried X, expected Y, but got Z instead" type questions. But I'll try to help in a general sense:
You need to break your problem down into smaller pieces and then take those pieces on one at a time. Write down exactly what you want to happen, in English, and that will be an algorithm that you can think about implementing with code.
Get something simple working. Can you write a simple sketch that plays a song? Then work your way forward in small steps. Can you write a simple sketch that prints out some numeric values based on the song that's playing? Separately from that, can you create a very simple visualization using hard-coded numbers? Get all of that working separately before you think about combining them into a sketch that shows a visualization based on a song that's playing.
Then if you get stuck, you can post a more specific question along with a MCVE. Good luck.

Avoid qrcode cloning

I was doing an app that reads qrcodes, and I was wondering how can I avoid that anyone with a qrcode generator could clone one of my qrcode.
I know I can't avoid the duplication (especially if you use a small number) but I was wondering if there is any approach I could use to reduce this or add an app validation to avoid this.
Thanks in advance
Either use a one-time-use id where the first person to access your URL wins, or just accept it as free advertising. If you really wanted to go to the trouble I guess you could probably print a watermark that obscures the code so it is unreadable, somewhat like the security features most checks have, but this really sounds like an XY problem.
Think about the problem you're really trying to solve and how so solve it. QR codes themselves are just as reproducible as emailing someone a link or giving someone a piece of paper with a word on it.

Farnsworth-Munsell 100-Hue Test

Has anyone any idea how the color codes for the caps from the farnsworth-munsell 100-hue test are? I'm trying to make the test myself, because the real one is too expensive, and I got myself familiar with the Munsell Color System. But still, I have no idea which of the thousands of Musell Colors I need for my test. And no book, or internet-site was able to tell me that so far...
I have seen this and hope it helps. http://www.torok.info/colorvision/dir_for_use.htm
I am also looking for a free test for i cannot afford one =( I am kind of scared that my eyes are not good at green.

IE6 filter alpha loader png24 freezing context

This is really unknown issue to many people. I would raise a question for it and make it easily accessible for other, and maybe someone of you know the solution for this problem.
All of us probably know that there is problem with alpha transparency in PNG24 in IE6 (still used by many people on web..). There are at least few known solutions how to solve that, but all of them got their problem that I would like to describe there:
1.Using progid:DXImageTransform.Microsoft.AlphaImageLoader:
This is most common trick to make images shown in IE6. Problem is that it uses DirectX to show it. So basically DX firstly need to download file from Net, then render it. This downloading block browser context for a while. But if you have alot of images - that means that you page can be freezed for even... few minutes (it happens to mine one project at least once).
http://blogs.cozi.com/tech/2008/03/transparent-pngs-can-deadlock-ie6.html
http://www.stum.de/2008/12/01/do-not-use-alphaimageloader-to-fix-transparent-pngs-in-ie6/
2.Using VML.
You can also use this workaround. However this has a nasty effect of rendering gray box in background, then a proper image, also causing to download image files twice - this however might be because of bad implementation so need to be checked.
3.Using PNG8.
Just forget about solutions and try use PNG8, if prepared correctly can still be looking good.
If anyone knows any other solution please give answer here!
You should definitely have a look at http://www.dillerdesign.com/experiment/DD_belatedPNG/

Making pictures look inset

I wonder if anyone has an idea how you have to transform an image such that it looks "inset" to the context?
I need the effect for an application I am writing, but I am not sure what the exact workflow is to achieve the effect mentioned above.
Best regards,
heinrich
Okay I've made it.
It is much playing around with paths and those stuff ...

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