[android-developers] Reusing bitmaps for BitmapFactory.decodeFile and BitmapFactory.Options.inBitmap

My app decodes a lot of bitmaps from sd card, so I want to reuse existing bitmaps to decrease GC work. I see examples from Android Training and this video and it works perfect forBitmapFactory.decodeResource, but not for BitmapFactory.decodeFile. I use next code:

private void testBitmapReusing() {          BitmapFactory.Options options = newOptions();          Bitmap bitmap = decode(options);            options.inBitmap = bitmap;          bitmap = decode(options);      }        private BitmapFactory.Options newOptions() {          BitmapFactory.Options options = new BitmapFactory.Options();          options.inSampleSize = 1;          options.inMutable = true;          return options;      }        private Bitmap decode(BitmapFactory.Options options) {          return  BitmapFactory.decodeFile("/mnt/sdcard/sun.jpg", options);          //  return BitmapFactory.decodeResource(getResources(), R.drawable.sun, options);      }

Commented code (BitmapFactory.decodeResource) works as expected, it decodes new bitmap using existing bitmap. But uncommented code (BitmapFactory.decodeFile) doesn't decode new bitmap. It just writes to log message "E/BitmapFactory: Unable to decode stream: java.lang.IllegalArgumentException: Problem decoding into existing bitmap"

So where is my mistake?

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