Android, change string and reload activity

We have our api_host string set in a java file.

• For testing purpose, we want to be able to change the api_host at runtime through a ui (provide a textinput where you can edit the api_host variable)

• Also we have to consider recreating the activity

  Because we are initializing a webview or React-Native view at onCreate method like the following: mReactRootView.startReactApplication(api_host)

Or just fresh implementation of managing api_host is welcome if it can provide the capability of changing the api_host value at runtime through a ui.