When using the ProgressBarAndroid I get a warning with the following text:
Warning: You are manually calling a React.PropTypes validation function for the
indeterminateprop onAndroidProgressBar. This is deprecated and will not work in the next major version. ...

just return <ProgressBarAndroid style={{ flex: 1 }} /> in render method
Switched to using ActivityIndicator
Oh my god, I completely forgot the new ActivityIndicator component.... Thanks
0.40.0-rc.2 still have the issue... Sad (
i solved it with this solution
stackoverflow