Android TextView.setText works after screen rotate

Question

Today I'm testing google ml-kit example.

I have rewritten LivePreviewActivity to show barcode value in TextView. Barcode reading is good. But TextView text changes only after rotating the screen or when we unlock the device.

Can you help me?

Activity example

Answer 1

Thanks to everyone who puzzled over my question.
The reason for the inability to update the textview is a very hard request to get the barcode value.
Solution: it was necessary to wrap a heavy request in the Handler.