Set BitmapFactory.Options.inSampleSize to a value larger than 1 (preferably to a power of 2). BTW: This info about decoding is all in the online java-doc... :)
On Jul 24, 11:14 pm, Agus <agus.sant...@gmail.com> wrote: > Is it possible to scale the outputted bitmap while decoding the stream > in one step? > I don't go with a two-step process. > > > > On Sat, Jul 24, 2010 at 8:02 PM, DanH <danhi...@ieee.org> wrote: > > inJustDecodeBounds in BitmapFactory.Options. > > > On Jul 24, 9:37 pm, Agus <agus.sant...@gmail.com> wrote: > >> 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 <danhi...@ieee.org> 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 <flyingdutc...@gmail.com> 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 <jesus...@gmail.com> 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 <danhi...@ieee.org> 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 <jesus...@gmail.com> 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 <nathan.d.mel...@gmail.com> 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 <jesus...@gmail.com> wrote: > > >> >> > > > > > So, how can I obtain the depth for know if I can work with > >> >> > > > > > the image? > > >> >> > > > > > On 23 jul, 18:18, DanH <danhi...@ieee.org> 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 <jesus...@gmail.com> 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 android-developers@googlegroups.com > >> > To unsubscribe from this group, send email to > >> > android-developers+unsubscr...@googlegroups.com > >> > 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. > > To post to this group, send email to android-developers@googlegroups.com > > To unsubscribe from this group, send email to > > android-developers+unsubscr...@googlegroups.com > > For more options, visit this group at > >http://groups.google.com/group/android-developers?hl=en- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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