Even in the emulator (Android 2.2) a page transition runs like this:
It is a big flickering and looks very broken.
Is that normal? What can I do about it?
It's normal. In fact this blog post about what to expect in jQuery Mobile 1.1 directly references that poor performance of transitions on Android. Looks like you will be stuck with it until the next release. I've seen the issue you talk about as well.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With