May 27, 2012

The curious BlinkLayout

While reading the source code of Android's LayoutInflater class I found a hidden gem that seems to be quite unnoticed yet. Ladies and gentlemen I present you the mighty BlinkLayout. Views that are placed inside this ViewGroup blink at a rate of 500ms.

The BlinkLayout is an inner class of the LayoutInflater and can therefore only be used in a XML layout that will be parsed by a LayoutInflater instance. Due to the implementation it's only possible to use it as root node using the <blink> tag inside a XML layout.

It seems like the BlinkLayout is available since Android 4.0 and isn't used in the Android source code I observed. Maybe it was added for debugging reasons and was forgotten later.

The video above shows the BlinkLayout in action using the following layout XML:

The following snippet was used to inflate the layout and pass it to the activity:


  1. Interesting stuff!
    But I think this isn't useful.. as for me.
    Today made repost in my blog

    1. Yeah, it's not really useful. It's more like an easter egg.

      So what's up with the repost thing? What's the use case of that? ;)