difference between methods to scale a bitmap

Question

There are at least two methods to scale a bitmap in Android, One is to use "inScaled, inDensity, inTargetDensity" in "BitmapFactory.Options" when decode a bitmap source. The other is to use a "Matrix" in "Bitmap.createBitmap".

What I am curious is what the difference between these two method is? What about the quality of produced bitmap? And what about the memory usage? etc...

Answer 1

Using BitmapFactory with the proper inScale options will allow you to be more memory efficient than using either Bitmap.createScaledBitmap() or Bitmap.createBitmap() with a matrix scale. However, it is more complicated.

Check out How do I scale a streaming bitmap in-place without reading the whole image first? for details.