How do i reduce app size?

I am a complete beginner. I saw an app on play store which has 10000 wallpapers and app size is only about 2.5 mb. When i made an app with about 150 photos(no extensions) the app size became 49 mb. How do i reduce app size. Is there any component or extension or anything that could help. Appreciated!!

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Reduce your image size/compress

Download the images when you first launch the app. If you don’t want the images to be accessible via the device (without root access), download them to the internal storage.

Internal storage:


See also here.

What you can do is, upload your images to some cloud storage and then download all those at once(download with the way of @Anke, as it’s best one) when the application is started first time then you can use those images

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