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POIs there a way to compact memory in android to lower the high water mark?
 

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    <p>Please note I do NOT have a memory leak. My question is about a subtler issue.</p> <p>I recently wrote an android app which does image processing. The image is loaded as a Bitmap, then copied out in pixels, processed in a way that uses lots of memory (think Fourier transforms in floating point representations and stuff), then converted back into a bitmap and saved.</p> <p>The problem is, through at least android OS 2.3, the total memory limitation (typically 16MB) is combined java and (externally stored) Bitmaps, and the java high water mark doesn't go down (that I can discern) even when the memory is free (successfully GC'd), which means when I go to allocate the final Bitmap, I am often "out of memory" even though by that point I have freed (and GC'd) most of the space. I.e., I never need the full 16MB at once, but the space left for Bitmaps appears to be 16MB minus the MAX historical java heap usage (as opposed to current usage).</p> <p>I watched a tech talk by one of the android developers about memory issues and he implied this problem has been fixed in subsequent versions of the OS (they moved Bitmap memory into the java heap space), but in the meantime most of the people wanting to use my app are running 2.2 or 2.3.</p> <p>Long story short, I am wondering if the java heap is ever compacted (de-fragmented, in effect) so that the high-water mark shrinks (and if so, how to make it happen)?</p> <p>If not, then does anybody have another suggestion how to deal with this problem?</p>
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    1. COYes, this is a bitch problem. It's especially bad on Acer Liquid.
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    2. COI guess there is similar problem with SQLite native code. Cursor native init method often fails with similar symptoms.
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