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I am fighting against OutOfMemoryError in my app.
I created a background image, which is 800 pixel x 480 pixel. When this image is loaded into the view that uses it as background, I think the OS will use 800*480*4 bytes for it. It is a lot of memory.
If I create a 10 pixel x 10 pixel 9-patch image to replace the whole screen image. The OS will auto-scale the 9-patch image to 800x480 when it renders the view that uses the 9-patch. My question is that, in the 9-patch case, how much memory will OS use to draw the scaled 9-patch image? will it be 10*10*4 bytes or 800*480*4 bytes?
Thanks.
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The Draw 9-patch tool is a WYSIWYG editor included in Android Studio that allows you to create bitmap images that automatically resize to accommodate the contents of the view and the size of the screen. Selected parts of the image are scaled horizontally or vertically based on indicators drawn within the image.
A 9 patch image is a regular png (. PNG) image which is needful for android app developers where they require to wrap any content within a background image without pixelating the background image.
Essentially, a 9-patch image is a custom graphic that scales the way that you intend it to, which you define when creating the graphic. Where supported, this stretchable image is automatically resized to accommodate the content as defined.
Firstly, if it is a background image, and could be scaled, please do so, as it is known to be the best practice (especially for backgrounds) and the slight loss of image clarity could be compensated by choosing the correct colours and/or background pattern.
Regarding memory, if you are using Drawable you are on the safe side. But the Bitmaps are apparently not allocated in a standard Java way but via native calls; the allocations are done outside of the virtual heap, but are counted against it. More on this problem here
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