Flutter compile warning

[yaymalaga]

I'm using flutter master branch up-to-date. The warning is the following one:

Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: /home/yaymalaga/.pub-cache/hosted/pub.dartlang.org/flutter_qr_reader-1.0.2/android/src/main/java/me/hetian/flutter_qr_reader/factorys/QrReaderFactory.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.