Hello, I comment, I made an application where it has many things added, extensions and others which the apk worked properly, but after the last update, when creating the .apk again, the screen was blank, it did not load.
After a long time and discard I got to solve it and it was the Spinner. After changing it (that is, replacing the spinner with another spinner) everything worked properly.
Hope this comment helps someone else and doesn’t waste your time.
Kind regards.