android background image slows down app

Question

I am using a viewpager to swipe amongst fragments in my app. I define the background in the XML, so

android:background=\"@drawable/bg_final\"

Answer 1

I'm a bit late, but this just bit me, and when running the GPU debugger, I noticed that the system scaled up my image! I had a 1920x1080 image, and it showed up as a 3780x6720 texture!

Ideally, you should have textures for each density in the respective folder (res/drawable-mdpi, res/drawable-hdpi, etc).

However, if you think your one texture is fine, put it into res/drawable-nodpi, not res/drawable. If you put it into res/drawable-nodpi, the system won't scale it up based on the dpi.

In my case, it changed a simple UI from 10fps on a Pixel XL to the full frame rate of 60fps.