Load many large bitmap images as thumbnails - Android -

-

i'm working on media player app , wish load album art images display in listview. right works fine images i'm auto-downloading last.fm under 500x500 png's. however, added panel app allows viewing full screen artwork i've replaced of artworks large (1024x1024) png's instead.

now when scroll on several albums high res artwork, java.lang.outofmemoryerror on bitmapfactory.

    static public bitmap getalbumartfromcache(string artist, string album, context c)     {     bitmap artwork = null;     file dirfile = new file(sourcelistoperations.getalbumartpath(c));     dirfile.mkdirs();     string artfilepath = sourcelistoperations.getalbumartpath(c) + file.separator + sourcelistoperations.makefilename(artist) + "_" + sourcelistoperations.makefilename(album) + ".png";     file infile = new file(artfilepath);     try     {         artwork = bitmapfactory.decodefile(infile.getabsolutepath());     }catch(exception e){}     if(artwork == null)     {         try         {             artwork = bitmapfactory.decoderesource(c.getresources(), r.drawable.icon);         }catch(exception ex){}     }     return artwork;     }

is there can add limit size of resulting bitmap object say, 256x256? that's bigger thumbnails need , make duplicate function or argument fetch full size artwork displaying full screen.

also, i'm displaying these bitmaps on imageviews small, around 150x150 200x200. smaller images scale down nicer large ones do. there way apply downscaling filter smooth image (anti-aliasing perhaps)? don't want cache bunch of additional thumbnail files if don't have to, because make managing artwork images more difficult (currently can dump new ones in directory , automatically used next time loaded).

the full code @ http://github.org/calcprogrammer1/calctunes, in src/com/calcprogrammer1/calctunes/albumartmanager.java, though there's not different in other function (which falls checking last.fm if image missing).

i use private function setup size want thumbnails:

//decodes image , scales reduce memory consumption public static bitmap getscaledbitmap(string path, int newsize) {     file image = new file(path);      bitmapfactory.options options = new bitmapfactory.options();     options.injustdecodebounds = true;     options.ininputshareable = true;     options.inpurgeable = true;      bitmapfactory.decodefile(image.getpath(), options);     if ((options.outwidth == -1) || (options.outheight == -1))         return null;      int originalsize = (options.outheight > options.outwidth) ? options.outheight             : options.outwidth;      bitmapfactory.options opts = new bitmapfactory.options();     opts.insamplesize = originalsize / newsize;      bitmap scaledbitmap = bitmapfactory.decodefile(image.getpath(), opts);      return scaledbitmap;      }

Comments

Post a Comment

Popular posts from this blog

Perl - how to grep a block of text from a file -

-
it can in xml or text format. how in general grep block of text in perl? <track type="ws"> <range> <rangestart>0</rangestart> <rangeend>146.912</rangeend> <locationindex>0</locationindex> <propertyindex>0</propertyindex> </range> </track> <track type="ps" id="1"> <range> <rangestart>0</rangestart> <rangeend>146.912</rangeend> <locationindex>1</locationindex> <propertyindex>1</propertyindex> </range> </track> i want grep type="ps" , till </range> . one solution open file, read line line , match block. open(fh, "file.txt"); foreach $line (<fh>) { if ($line =~ m/type="cc"(.*?)<\/range>/) { print $1; } } but there more optimal solution without reading file line l
Read more

delphi - How to remove all the grips on a coolbar if I have several coolbands? -

-
Image
if set mycoolbar.fixedorder true,only grip on first band hidden. well,if use delphi 7 create vcl forms application,then put coolbar on , create 3 coolbans hold other controls,only grip , top coolbands can hidden setting mycoolbar.fixedorder:=true. i've uploaded picture make things clear. you got fixedorder property wrong. fixed property not allow bands rearranged if set true . setting property of coolbar true keep user changing bands order @ runtime, user can still move , resize bands. can give advice can do, actual solution problem, well, have wait answer. my advice use 3 coolbars in row , setting "fixedorder" property true , bandborderstyle bsnone . way grip hidden on of them. about property, it's not bug of ide, actual preference of property.
Read more

javascript - Animating array of divs; only the final element is modified -

-
this baffling me @ moment. i'm experienced programmer looking throw bit of surprise fiancee on countdown page our wedding. desired effect simulated confetti falling behind main page. setup follows: i have array of divs in javascript. each div absolutely positioned on page. have interval set updates every 50 or milliseconds. on each tick, run loop on array of divs, , calculations , update positions. problem problem having, however, though can see divs created, stored array, , modified (in case, each has slight randomized rotation) during initialization phase, once tick update position starts, div stored in whatever last slot of array gets position updated. tried hard-coding each div index testing purposes, strictly last element update position. upon printing current "left" , "top" style values each div before , after calculations shows value has been changed, no visible change noticeable. here's basic code: javascript var container;
Read more