So when I tried to interact with a InputText object on my Android device using a basic InputText example (Babylon.js Playground), I got an alert prompt to come up where I could enter text and that triggered my keyboard. Are you able to repro your issue on the PG that I provided?
Hello, thank you very much for your answer. I have just used the PG you provided to demonstrate on my mobile phone, but the keyboard did not pop up. I have been wondering whether it is the compatibility problem of my mobile phone, and even wondered whether the soft keyboard can be used to realize the input function.
So when I tried it, I was using an Android 12 phone as well. I spun up an Android 9 emulator and was able to get the keyboard to pop up. As far as I know, there should be no issue with most versions of Android (should be supported by Chrome Android version 12; current version is around 103). By any chance, are you using a browser other than Chrome or have some kind of custom keyboard?