I did try your code but can't resolve this error
"requiring module fetch which threw an exception...".

It happen without opencage.

my steps:
It's work until I add opencage.
after that, if i remove opencage and relevant code, it always complain about 'this' not defined.

And i found that react-native-elements depend on opencollective that depend on node-fetch. Perhaps it's related ?

I use Expo with my Android phone over local wifi
Perhaps a cache problem ?

Any idea ?