Load the picture in the size you need it, by setting the BitmapFactory.Options.inSampleSize to a value larger than 1 (so far, i have only managed to use value that are powers of 2 for this inSampleSize attribute). Look at the api-docs for more info on this attribute.
What i mean is that if you load the picture to be shown on your screen, you need only a 320x480 pic, i.e. a inSampleSize=4 would do. If you load your pic as a small thumbnail, even a larger value of inSampleSize would do. Also, if you load a pic to be shown on the screen, use RGB_565 and not ARGB_8888. RGB_565 uses only 2 bytes per pixel, ARGB_8888 uses 4 bytes per pixel. In my app, i have managed to load on full-sized RGB_565 (2048x1536) and a bunch of smaller pics at the same time. Or a 2 half-sized ARGB_8888 (1024x768) and a bunch of smaller sized pics at the same time. Two full-sized RGB_565 always got me that out-of-memory exception. I also wrote a 'bitmap-memory' notifier: Each class that created bitmaps listens to this notifier. If notified, these classes will recycle bitmaps and empty bitmap-caches (where possible). If another class needs to create a large bitmap it will signal this 'bitmap- notifier' to ask its listeners to clean up as much memory as possible. This has worked for me so far. On Jun 30, 11:00 pm, 楊健 <[email protected]> wrote: > Thank you for you answer. > > I monitored the memory heap by Runtime.getRuntime().freeMemory() and > totalMemory();. > When my app starts (free is 700k,total is 2.7M) > When I take picture，the picture is 1.2M (free is 700k,total 5M) > The log shows 07-01 11:31:27.062: INFO/dalvikvm-heap(395): Grow heap (frag > case) to 5.020MB for 1337498-byte allocation > If I do not call System.gc() before i load the picture it will throw the OOM > exception as I pasted. > I thought at that time I just to allocate for 1.2M. > Is it means it is very dangerous to load picture ,I had better to check and > release the memory every time? > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Mark Murphy > Sent: Wednesday, July 01, 2009 11:38 AM > To: [email protected] > Subject: [android-developers] Re: Is the limit of memory heap only 6M? > > 楊健 wrote: > > 07-01 11:32:02.192: VERBOSE/QualcommCameraHardware(35): state > > transition QCS_WAITING_JPEG --> QCS_IDLE > > 07-01 11:32:02.232: ERROR/dalvikvm-heap(395): 6291456-byte external > > allocation too large for this process. > > 07-01 11:32:02.232: ERROR/(395): VM won't let us allocate 6291456 > > bytes > > 07-01 11:32:02.242: DEBUG/AndroidRuntime(395): Shutting down VM > > 07-01 11:32:02.242: WARN/dalvikvm(395): threadid=3: thread exiting > > with uncaught exception (group=0x4000fe70) > > 07-01 11:32:02.242: ERROR/AndroidRuntime(395): Uncaught handler: > > thread main exiting due to uncaught exception > > 07-01 11:32:02.302: ERROR/AndroidRuntime(395): > > java.lang.OutOfMemoryError: bitmap size exceeds VM budget > > > My app shut down when i load a jpg file,i can avoid it by call > > system.gc().But I think memory limit will be 14M or 16M. > > The available heap is 16MB. That does not necessarily mean that there is > a contiguous 6MB buffer that you can allocate, depending on what else > your application is doing. > > -- > Mark Murphy (a Commons > Guy)http://commonsware.com|http://twitter.com/commonsguy > > Android App Developer Books:http://commonsware.com/books.html- Hide quoted > text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
