Recyclerview lagging in scrolling

Issue

I'm trying to make a music app just to practice with Kotlin and I made a Recyclerview and function that fetches data from external storage.

Now my problem is that when I ever scroll up or down it keeps lagging and I think the reason is that in onBindViewHolder function I create a bitmap from the Uri by using this code

  bitmap = MediaStore.Images.Media.getBitmap(contentResolver,album_uri)
                       

And then I set the bitmap

holder.song_image.setImageBitmap(songList[position].image)

I thought maybe if I create all bitmap all in once and place them into the Arraylist before I create the Recyclerview would help to stop the lag and it did but I had another problem that I can't deal with it in the main thread cause it freezes.

I didn't know what to use so I searched on what to use for that and I read about coroutines but I felt it's kinda for multiple threading/tasks with delay and what so ever but I just needed to do one simple task without freezing the UI Thread.

Solution

Try to use image-loading libraries like Glide, Picasso, Coil. They can load images on background threads.

Answered By - Botirali Kozimov