Did you try the Flutter code? The THETA X is the main development camera for the Getting Started Guide and Android Pixel 2, 3, 4 are the main phone test units.
This is a simple example:
I’ll look at the Android SDK from RICOH and test it with the X.
Update - July 25, 2022 Evening
SDK from RICOH GitHub repo works as expected on physical device Google Pixel 4a running Android 12.
Turn off the LCD on the X while the app is being used to reduce the heat and increase the stability of the API commands between the THETA X and your mobile phone.