In an Android App, when are resources loaded to memory?

Question

I've added about 35 images to my res/drawable folder and another 30 sound files to res/raw folder. Now my application takes a good 5 seconds longer to start even tough only 1 image and 1 sound resource is used for the startup screen. That makes me ask: When are my image resources loaded into memory?

Are they loaded when the application starts or when I use them for the first time? (Ex: when I call ImageView.setImageResource(myResId);)

If they are all loaded when the app starts, how can I avoid this? If each one is loaded on demand, why is my application taking longer to start?

Info about app for insight: Single activity with a ViewPager. Each view page uses one of the image resources which is a jpeg file with 700x400 px resolution (~50K) and one of the sound files which is an mp3 file <5 sec (~60K).

Are you making all the pages at the same time? – A--C Dec 24 '12 at 20:38 — A--C, Dec 24 '12 at 20:38
Nope, page views are created when user flips. – e-mre Dec 24 '12 at 20:40 — e-mre, Dec 24 '12 at 20:40

score 1 · Answer 1 · answered Dec 24 '12 at 23:02

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Are they bitmaps? I found this in the android dev website:

http://developer.android.com/training/displaying-bitmaps/process-bitmap.html

answered Dec 24 '12 at 23:02

recheej

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Doesn't really answer the question in the title. – Daniel May 19 '20 at 01:10

score 0 · Answer 2 · answered Jan 20 '21 at 19:54

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This probably will answer your question https://stackoverflow.com/a/40282371/1603602.

The short answer based on the information in this link is: All resources are loaded in the memory regardless of you used them or not.

answered Jan 20 '21 at 19:54

user1603602

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In an Android App, when are resources loaded to memory?

2 Answers2