How to display a large amount of "views" in an activity using Android Studio ?

Question

I'm relatively new on app development.

I am working on an app in which a picture is treated as such :

1) I pixelate it, with the height / width defined by the user (using a seekbar, *I already have done this part*)

2) Displaying a grid of pixel matching the new pixelated image, where the user can enable or disable a pixel.

The 2) doesn't need to display every pixel on screen, the user would have to scroll vertically or horizontally.

I already tried to use a "RecyclerView" using a GridLayout adapter (nb of columns match pixelated image's width) and displaying "imageViews" (without image, just a background color) as pixels, with a click event to enable/disable one of these.

Problem : using a (let's say) 100 by 100 "pixel" grid, the app is so slow that a pixel disables 5 seconds after I click it (the "visible" grid is only about 6 by 6 pixels at the moment).

Do you think I made something wrong in my recyclerView ?
Should I use another thing instead of an "imageView"/"recyclerView"?

Thanks in advance 🙂

Answer 1

Did you test your code in an Android device or only in Android Studio?

Answer 2

Yes I tested it several times on my android phone...

Answer 3

I have an alternative solution which involves a grid layout using only a part of the pixelated image, and I will use buttons to navigate on the image (left riqht up n down), updating the whole grid layout every time