Back button closed app

I'm basically want to convert part of my website to become android app. I'm using web container, but the problem is when i tried on my xiaomi note 3 the back button is closing the app instead of back to previous page.

Could someone show me what i'm doing wrong?

Start by reproducing the back-button behavior on the Android web container described in the issue, using the Xiaomi Note 3 report as context. Trace how the container handles Android back navigation and compare it with the expected previous-page behavior; done means the back button returns to the prior page instead of closing the app.

Written by the indexing model from the issue text.