Sorry for going slightly off-topic, how do I determine the dimension of the picked gallery image without reading it first using DecodeBitmap.decodeStream(InputStream) method ? I am decoding the original image which causes OutOfMemory error frequently.
On Sat, Jul 24, 2010 at 3:47 PM, DanH <[email protected]> wrote: > Yeah, I was assuming that the space for the bitmap is allocated in > Java heap, without thinking that many phones allocate graphics > separately. Obviously, if the bitmap is allocated outside of the Java > heap then freeMemory() does you zero good. But my point was that > freeMemory() only returns the amount of heap not allocated to objects > at the moment. If there is heap allocated to "dead" objects (that > would be collected by a GC) then that space is considered "allocated", > from the standpoint of freeMemory(). And, of course, there's no way > to know how much "dead" heap storage there is without actually running > GC. > > So whether or not the bitmap is allocated in Java heap, freeMemory() > is not real useful, at least not without actually running a (full) GC > cycle first. > > On Jul 24, 5:20 pm, Streets Of Boston <[email protected]> wrote: >> First a small correction on DanH's reply, ARGB_8888 uses 32 bits (4 >> bytes), not 64 bits. >> >> The memory used by a Bitmap is roughly Width*Height*Depth bytes. (e.g. >> a 1MPixel image in RGB_565 uses 2MByte of memory). I say roughly, >> because the Bitmap object itself, holding the raw data, occupies a few >> bytes itself. >> >> The problem is that the (garbage collector of) DalvikVM does not 'see' >> the raw image data. It only sees the the memory usage of the Bitmap >> object without the raw data (a few bytes). That's why the call to >> 'freeMemory()' does not seem correct. It only reports the difference >> between the max available memory minus the memory used by Java objects >> (which does not include raw image data). >> >> However, the raw image data does affect the memory usage of your app's >> Linux process, which is limited to either 16MByte or 24MByte. >> >> E.g. if your app's free memory is 1.5MByte and you create a 2MByte >> Bitmap, the DalvikVM does not see the need to run the garbage >> collector to free up old un-referenced objects, because to DalvikVM it >> looks like it only needs to create a few bytes for the Bitmap object >> itself and does not see the danger of a possible out-of-memory >> situation. >> >> In my image-editing app, i try to mitigate this (not quite solve it), >> by calling a System.gc() just before creating a (relatively) large >> Bitmap. This reduces the chance of an out-of-memory error. >> >> On Jul 24, 2:03 pm, ReyLith <[email protected]> wrote: >> >> > First of all thank you very much everyone for your help. >> >> > I continue with a problem. I use Runtime.getRuntime().freeMemory() for >> > obtain the free memory and compare it with the real Bitmap memory. >> > Sometimes I get a free memory less than that occupied by the image. >> > However, if I remove the restriction on the size of the image, I can >> > work with it without any problem. Am I using an incorrect function to >> > get the free memory?. Should I use another function? >> >> > Thank you very much in advance. >> >> > On 23 jul, 20:40, DanH <[email protected]> wrote: >> >> > > Close as I can tell, you use a BitmapFactory.Options and put a >> > > BitmapConfig constant in that that specifies the type of internal >> > > representation you want. If you use ARGB_8888 then each pixel will be >> > > 64 bits. ARGB_4444 -- 32 bits, RGB_565 -- 16 bits. >> >> > > On Jul 23, 12:21 pm, ReyLith <[email protected]> wrote: >> >> > > > Thanks Nathan. >> >> > > > With this option I can obtain the image characteristics but I don't >> > > > know the option that indicates me the depth of the pixel. Width and >> > > > Height are in outWidth and outHeight but I don't know where is the >> > > > depth. I thought use the getRowBytes() of Bitmap and product it with >> > > > getHeight() of Bitmap, but I don't know if there is correct. >> >> > > > On 23 jul, 18:52, Nathan <[email protected]> wrote: >> >> > > > > If you can get the width and height for the image without completely >> > > > > opening it, then use the width*height*depth. >> >> > > > > You probably have to use this option: >> >> > > > >http://developer.android.com/intl/de/reference/android/graphics/Bitma... >> >> > > > > Nathan >> >> > > > > On Jul 23, 9:30 am, ReyLith <[email protected]> wrote: >> >> > > > > > So, how can I obtain the depth for know if I can work with the >> > > > > > image? >> >> > > > > > On 23 jul, 18:18, DanH <[email protected]> wrote: >> >> > > > > > > The size of an image file depends greatly on the compression >> > > > > > > techniques used to create it. Virtually all image formats >> > > > > > > involve >> > > > > > > some sort of compression such that the total number of bits in >> > > > > > > the >> > > > > > > file is considerably less than the (width * height * depth) >> > > > > > > number >> > > > > > > that represents the raw image. >> >> > > > > > > On Jul 23, 7:27 am, ReyLith <[email protected]> wrote: >> >> > > > > > > > Hi again, >> >> > > > > > > > I'm trying to put a message when the image is so big. For this >> > > > > > > > I think >> > > > > > > > to obtain the size of the file and compare it with the free >> > > > > > > > memory >> > > > > > > > Runtime.getRuntime().getFreeMemory()). It works well but I >> > > > > > > > have a new >> > > > > > > > problem. The application show an error message with some images >> > > > > > > > because they are so big and the application dont't detect the >> > > > > > > > problem. >> > > > > > > > I research in other posts and the problem is that the file >> > > > > > > > size is >> > > > > > > > different from the size of the image in memory. To get the >> > > > > > > > size of the >> > > > > > > > image in memory I use the product getHeight () * getRowBytes >> > > > > > > > () of the >> > > > > > > > Bitmap class, but with some images not previously had >> > > > > > > > problems, I get >> > > > > > > > very large sizes, so often I get the message erroneously. >> >> > > > > > > > Does anyone know how could solve this problem? >> >> > > > > > > > Thank you very much in advance.- 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 -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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