Decoding subsampled bitmaps in Android
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Published on 2010-04-14T23:22:43Z
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2010/04/14
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I decode bitmaps from the SD card using BitmapFactory.decodeFile
. Sometimes the bitmaps are bigger than what the application needs or that the heap allows, so I use BitmapFactory.Options.inSampleSize
to request a subsampled (smaller) bitmap.
The problem is that the platform does not enforce the exact value of inSampleSize, and I sometimes end up with a bitmap either too small, or still too big for the available memory.
From http://developer.android.com/reference/android/graphics/BitmapFactory.Options.html#inSampleSize:
Note: the decoder will try to fulfill this request, but the resulting bitmap may have different dimensions that precisely what has been requested. Also, powers of 2 are often faster/easier for the decoder to honor.
How should I decode bitmaps from the SD card to get a bitmap of the exact size I need while consuming as little memory as possible to decode it?
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