> How to open a high resolution png picture, the picture is
> 4000x3000,but it crashed when it was decoded.
It depends what you want to do with the image.
If it is a background for a game and you need it at this size, then
you need to break it up and come up with a common tile preloading
scheme.
If you just want to display it on the screen you just need to
downscale it a lot.
I use this function in my code to try to get the biggest picture that
can actually fit in memory, it's far from perfect, especially the fact
that you actually can't feed the sampleSize with a float and have to
go full integer at a time but it works without degraging the picture
quality even when displayed on tablets :
private Bitmap getDownsampledBitmapFromFile(String fileName, int
sampleSize) {
//Try to free up some memory
System.gc();
System.runFinalization();
System.gc();
BitmapFactory.Options options=new
BitmapFactory.Options();//reset
object
byte[] tempBuffer=new byte[8000];
options.inTempStorage = tempBuffer;
options.inSampleSize=sampleSize;
Bitmap downsampledBitmap = null;
try {
downsampledBitmap =
BitmapFactory.decodeFile(fileNameToUpload,
options);
} catch (OutOfMemoryError e) {
sampleSize ++;
}
return(downsampledBitmap);
}
I'm using it 'as is' because it worked for my purpose but if I had
time I would run a benchmark to test if the double gc and finalization
could not be moved to the catch and allow for a bigger size image to
be computed without outofmemory exception.
Yahel
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