Image handling in Android

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Image handling in AndroidImage handling in Android

Tyrone Nicholas@[email protected]

Tyrone Nicholas@[email protected]


•~1/10 device RAM

•480 x 800 = 1.5 MB


GCGC

java.lang.OutOfMemoryError


Android heapsAndroid heaps

Dalvik

•JDK

•Limited

•Slow

•Safe

Other

•Certain system

calls

•Like native

Native

•NDK

•Unlimited

•Fast

•Unsafe


What to do with images?What to do with images?


An image pipelineAn image pipeline

WebP

BMP

BMP JPG

JPG

JPG

UI thread Non-UI threads


Copying heap to heapCopying heap to heap


Using native heap from JavaUsing native heap from Java


BitmapsBitmaps


AshmemAshmem

• create

• pin

• unpin


Purgeable bitmapsPurgeable bitmaps

DrawDraw DecodeDecode PinPin

Stop drawin

g

Stop drawin

gUnpinUnpin


Using Purgeable BitmapsUsing Purgeable Bitmaps


Er, wait a minute…Er, wait a minute…


Solution #3 – Bitmap PoolingSolution #3 – Bitmap Pooling


Hang on…Hang on…

@YourTwitterHandle#DVXFR14{session hashtag} @tyronen@tyronen#facebook#facebook

Facebook

’s

solution


From the Android NDKFrom the Android NDK


Create a new method…Create a new method…


…and use it…and use it


But afterwards…But afterwards…

@YourTwitterHandle#DVXFR14{session hashtag} @tyronen@tyronen#facebook#facebook

Q & A

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Image handling in Android

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