CODEWITHSUNDEEP
androidmemorybitmap
esse
esse

Reputation: 5549

android bitmap keep dimensions same reduce memory

I have an application that displays lots of images, and images can be of varying size up to full screen dimensions of device. The images are all downloaded, and I use imagemagick to reduce colors of image to compress the file size, while keeping dimensions the same, to reduce download time. The reduced color space is fine for my application.

The problem is that when I load the image into a Bitmap in android the file size is much larger because of androids Bitmap config of ARGB_8888, I do need the ALPHA channel. Since ARGB_4444 is deprecated and had performance issues I am not using that. I am wondering if there is any other way to reduce the memory footprint of the loaded Bitmap while keeping the dimensions the same as the original?

---- Update ---

After discussions here and lots of other searching/reading it does not appear that there is a straight forward way do this. I could use ARGB_4444 which stores each pixel as 2 bytes, rather than 4 bytes per pixel. The problem there is that ARGB_4444 is deprecated, and I try not to use deprecated parts of the API for obvious reasons. Android recommends use of ARGB_8888 which is the default, since I need alpha I have to use that. Since there are many applications that do not need such a complex color space it would be nice to see ARGB_4444 or something similar become part of the supported API.

Upvotes: 1

Views: 2599

Answers (2)

Kiran Kumar
Kiran Kumar

Reputation: 1212

Read a similar answer I posted here

Basically, bitmap recycle is required for Pre honeycomb devices to reduce memory usage

Upvotes: 0

Luis
Luis

Reputation: 12048

If you don't need alfa (transparency) you can use:

Bitmap.Config.RGB_565

which uses 2 bytes per pixel, instead of 4, reducing size by half.

You should also look at BitmapFactory.Options:

inSampleSize
inScaled

These values correctly set for your requirements, may have a very positive effect on Bitmap memory requirements.

Regards.

Upvotes: 4

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