Android how to scale an image with BitmapFactory Options


I want to decode an image from the SD card with BitmapFactory.decodeFile(path, options).
I also want images that are larger than 2048×2048 pixels to be scaled down to at most 2048×2048 (maintaining the proportions).
I could do this manually after getting the bitmap, but that would require allocating a large amount of bytes in addition to the ones already allocated.
How should i set up my BitmapFactory.Options object to get that effect?

Best Solution

Use BitmapFactory.Options.inSampleSize when you first load your image to get the size as close as possible to your target size, then use Bitmap.createScaledBitmap to scale to the exact size you want.

There's some code for this in this answer.