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Could not find com.github.barteksc:android-pdf-viewer:3.2.0-beta.1.

A nullable expression can't be used as a condition.

Trong trường hợp này thì sử dụng câu điều kiện value!= null trước, sau đó mới thực hiện các câu điều kiện khác.

Note: Some input files use or override a deprecated API.

Warning: unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}layoutlib>,<{}api-level>

Lỗi "Navigator operation requested with a context that does not include a Navigator." khi sử dụng Navigator

======== Exception caught by gesture ==============
The following assertion was thrown while handling a gesture:
Navigator operation requested with a context that does not include a Navigator.

The context used to push or pop routes from the Navigator must be that of a widget that is a descendant of a Navigator widget.
When the exception was thrown, this was the stack:
#0 Navigator.of. (package:flutter/src/widgets/navigator.dart:2553:9)
#1 Navigator.of (package:flutter/src/widgets/navigator.dart:2560:6)
#2 Navigator.push (package:flutter/src/widgets/navigator.dart:2016:22)
#3 MyMultiScreen.build. (package:multiscreen/main.dart:23:25)
#4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:989:21)
#5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:198:24)
#6 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
#7 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)