Comments on Interfuser: Android, Reflections with Bitmaps

Great post. I used the techniques you outlined to ...

2012-01-20T06:53:23.159-08:00

Great post. I used the techniques you outlined to create a custom View which will apply this reflection effect to any set of child Views. Would be interested to here your thoughts. http://tomtheguvnor.wordpress.com/2012/01/19/creating-a-reusable-fading-reflection-view-effect-in-android/

I am sorry, I totally understand your code, but wh...

2011-05-23T05:54:43.737-07:00

I am sorry, I totally understand your code, but when I read further on alpha blending, I'm very confused.... I know I have next to no knowledge on computer graphic, but I really want to know more about it, because this is the second time I've encountered "Alpha blending". The first time is when I wrote a Live-wallpaper. What book would you recommend me reading to start off? Thank you !

Great stuff. Exactly what I was looking for .-)

2011-02-07T09:43:23.363-08:00

Great stuff. Exactly what I was looking for .-)

This looks really useful. Any pointers on doing th...

2010-11-16T15:14:27.909-08:00

This looks really useful. Any pointers on doing this from a starting point of a canvas as opposed to a bitmap? i.e. I've drawn some stuff onto a canvas (obtained from surfaceHolder.lockCanvas()) and now I want to create a reflection of what I drew. I can't find any way of getting the bitmap from a canvas...

Great! Thanks very much for posting this! Could ...

2010-11-11T15:12:25.042-08:00

Great! Thanks very much for posting this! Could someone clairify the line:
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
Sorry for my ignorance but what is Xfermode?

"Just a suggestion to improve memory usage, y...

2010-11-11T13:44:27.849-08:00

"Just a suggestion to improve memory usage, you could use this Canvas method:

drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint)"

That actually doesn't work. I think there is a bug in Android that prevents that method from working properly when scaling is applied. If I comment out the matrix.preScale() line it will draw the bitmap, but not upside down. However, leaving the preScale() in there causes it to not draw anything.

It was a good suggestion if Android actually worked as expected, otherwise you're just wasting your time. Just stick to the code posted in the blog post, and it will work.

Excellent tip! But do i see some bad artefacts in ...

2010-10-26T13:12:35.461-07:00

Excellent tip!
But do i see some bad artefacts in starsailor reflection?
Is that a screenshot or application artefact ?
Just wondering because i got the same atrefact which can be clearly seen on a simple alpha gradient fade out effect :(
Any ideas on the cause or workaround ?

Anyways great reflection techique, thanks for sharing

Thanks helpful suggestions are always very welcome...

2010-09-08T04:53:11.357-07:00

Thanks helpful suggestions are always very welcome

Just a suggestion to improve memory usage, you cou...

2010-09-08T04:46:43.643-07:00

Just a suggestion to improve memory usage, you could use this Canvas method:
drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint)

this way, you avoid allocating memory for the second bitmap. I don't think that the impact on cpu usage is high, as all android phones have 2d acceleration built-in for the screen effects.

Thanks Neil Davies for u r post. It will be helpfu...

2010-09-02T04:22:55.447-07:00

Thanks Neil Davies for u r post. It will be helpful for me if u post how to save the final bitmap as image.

WOW....speachless

2010-08-20T03:52:31.682-07:00

WOW....speachless

Thanks, this is a lot of help on the project i'...

2010-04-20T20:19:30.964-07:00

Thanks, this is a lot of help on the project i'm working on.

Thanks for taking the time to comment it's rea...

2010-03-30T00:32:22.169-07:00

Thanks for taking the time to comment it's really great to hear that people find what I've written is useful and informative.

This is great stuff. I don't see many comments...

2010-03-29T08:24:00.150-07:00

This is great stuff. I don't see many comments on your posts, and I'm not sure why. Perhaps a "how-to" blog's posts don't warrant much discussion? Either way, your blog has been tremendously helpful to me. It's very informative and easy to understand, and best of all, sheds light on how to do some really cool stuff with Android that I may otherwise never figure out. So thank you, and keep up the good work!