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Basically, I have images that I'd like to to update them sequentially into the same view to create custom ProgressBar.

I found Tumblr to do just that with their ProgressBar(ImageView?).

Here I put the animation side-by-side to show how the image actually cross-fade from Aa into a camera. Tumblr progress view

Exactly what I wanted:

  1. Cross-fading effect
  2. Indeterminate
  3. Use the same view (I dumped view hierarchy to check)
  4. Animation during transition (The image actually pop a little when spinning and cross-fading into the next image)

So far I have tried:
1. Frame Animation, this allows for unlimited item(s) with definable durtion. However, it doesn't cross-fade the image and there's no way to listen to the transition's event to apply other animation, etc.
2. Transition Drawable, this allows cross-fading between EXACTLY two drawables. So this doesn't allow for the number of items and interminate duration as well.

I also came across CrossFadeDrawable by Romain Guy just now but it looks like it's only coded to support only two Drawable.

Right now I am not very sure if I'm approaching in the right direction or is there something I need to learn in order to do this kid of effect?

RobGThai
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1 Answers1

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I'm not sure if you are approaching this direction but isn't this what you are looking for: http://www.youtube.com/watch?v=atH3o2uh_94

Endian Ogino
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  • Yes, I have. That's Transition Drawable. As I stated in my finding #2, it only support cross-fading between two drawables. – RobGThai Jun 07 '13 at 13:37
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    And because you looked at TransitionDrawable you probably also noticed that it holds a simple list of Drawables via mLayerState.mChildren and hardcoded indices. So though there seems to be no framework support you got everything to code it yourself. – Endian Ogino Jun 10 '13 at 23:42
  • I went looking inside TransitionDrawable, a lot of classes they are using were protected subclass inside `android.graphics.drawable`. To imitate the whole process will require moving classes and styles from Android to my own application. – RobGThai Jun 12 '13 at 04:39