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<http://developer.android.com/training/displaying-bitmaps/manage-memory.html#inBitmap>and
this
video <http://www.youtube.com/watch?v=rsQet4nBVi8>
<http://savefrom.net/?url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DrsQet4nBVi8&utm_source=chromelite&utm_medium=extensions&utm_campaign=link_modifier>and
it works perfect for
BitmapFactory.decodeResource<http://developer.android.com/reference/android/graphics/BitmapFactory.html#decodeResource%28android.content.res.Resources,%20int,%20android.graphics.BitmapFactory.Options%29>,
but not for
BitmapFactory.decodeFile<http://developer.android.com/reference/android/graphics/BitmapFactory.html#decodeFile%28java.lang.String,%20android.graphics.BitmapFactory.Options%29>.
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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