[Bug] build warnings: [unchecked] unchecked conversion and unchecked call

[lukaskurz]

BUG REPORTS WITHOUT PROVIDING THESE INFORMATIONS WILL BE CLOSED DIRECTLY. DON'T REMOVE THE SECTIONS!

Describe the bug
Building reveals warnings

Note: Some input files use unchecked or unsafe operations.              
Note: Recompile with -Xlint:unchecked for details.

To Reproduce
Steps to reproduce the behavior:

1. Install barcode_scan
2. Run flutter build apk

Expected behavior
I expected no build warnings from the library code.

Screenshots
If applicable, add screenshots to help explain your problem.

Logs
Building with "-Xlint:unchecked" in project level build.gradle

Build log

Deleting build... 270ms
Deleting .dart_tool... 14ms
Deleting Generated.xcconfig... 0ms
Deleting flutter_export_environment.sh... 0ms
Running "flutter pub get" in app... 0.5s
Precompiling executable...
Precompiled build_runner:build_runner.
[INFO] Generating build script...
[INFO] Generating build script completed, took 256ms

[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed, took 9.1s

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 570ms

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 0ms

[INFO] Running build...
[INFO] Generating SDK summary...
[INFO] 2.4s elapsed, 0/16 actions completed.
[INFO] Generating SDK summary completed, took 2.4s

[INFO] 3.5s elapsed, 1/17 actions completed.
[INFO] 4.5s elapsed, 4/20 actions completed.
[INFO] 5.6s elapsed, 7/23 actions completed.
[INFO] 6.6s elapsed, 8/24 actions completed.
[INFO] 9.0s elapsed, 8/24 actions completed.
[INFO] 12.8s elapsed, 9/24 actions completed.
[INFO] 13.9s elapsed, 40/47 actions completed.
[INFO] Running build completed, took 14.6s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 52ms

[INFO] Succeeded after 14.6s with 12 outputs (147 actions)

Precompiling executable...
Precompiled flutter_launcher_icons:main.
Android minSdkVersion = 18
Creating default icons Android
Adding a new Android launcher icon
Overwriting default iOS launcher icon with new icon
You are building a fat APK that includes binaries for android-arm, android-arm64, android-x64.
If you are deploying the app to the Play Store, it's recommended to use app bundles or split the APK to reduce the APK size.
To generate an app bundle, run:
flutter build appbundle --target-platform android-arm,android-arm64,android-x64
Learn more on: https://developer.android.com/guide/app-bundle
To split the APKs per ABI, run:
flutter build apk --target-platform android-arm,android-arm64,android-x64 --split-per-abi
Learn more on: https://developer.android.com/studio/build/configure-apk-splits#configure-abi-split
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/ConfigurationOuterClass.java:1231: warning: [unchecked] unchecked call to DefaultInstanceBasedParser(T) as a member of the raw type DefaultInstanceBasedParser
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
where T is a type-variable:
T extends GeneratedMessageLite<T,?> declared in class DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/ConfigurationOuterClass.java:1231: warning: [unchecked] unchecked conversion
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
required: Parser
found: DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/AndroidConfigurationOuterClass.java:396: warning: [unchecked] unchecked call to DefaultInstanceBasedParser(T) as a member of the raw type DefaultInstanceBasedParser
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
where T is a type-variable:
T extends GeneratedMessageLite<T,?> declared in class DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/AndroidConfigurationOuterClass.java:396: warning: [unchecked] unchecked conversion
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
required: Parser
found: DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/ScanResultOuterClass.java:884: warning: [unchecked] unchecked call to DefaultInstanceBasedParser(T) as a member of the raw type DefaultInstanceBasedParser
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
where T is a type-variable:
T extends GeneratedMessageLite<T,?> declared in class DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/ScanResultOuterClass.java:884: warning: [unchecked] unchecked conversion
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
required: Parser
found: DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/Protos.java:645: warning: [unchecked] unchecked call to DefaultInstanceBasedParser(T) as a member of the raw type DefaultInstanceBasedParser
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
where T is a type-variable:
T extends GeneratedMessageLite<T,?> declared in class DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/Protos.java:645: warning: [unchecked] unchecked conversion
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
required: Parser
found: DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/Protos.java:1902: warning: [unchecked] unchecked call to DefaultInstanceBasedParser(T) as a member of the raw type DefaultInstanceBasedParser
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
where T is a type-variable:
T extends GeneratedMessageLite<T,?> declared in class DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/Protos.java:1902: warning: [unchecked] unchecked conversion
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
required: Parser
found: DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/Protos.java:2728: warning: [unchecked] unchecked call to DefaultInstanceBasedParser(T) as a member of the raw type DefaultInstanceBasedParser
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
where T is a type-variable:
T extends GeneratedMessageLite<T,?> declared in class DefaultInstanceBasedParser
/home/lukaskurz/coding/demoproject/app/build/barcode_scan/generated/source/proto/release/javalite/de/mintware/barcode_scan/Protos.java:2728: warning: [unchecked] unchecked conversion
PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);
^
required: Parser
found: DefaultInstanceBasedParser
12 warnings
/usr/share/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-5.5.0/android/src/main/java/io/flutter/plugins/urllauncher/WebViewActivity.java:41: warning: [deprecation] shouldOverrideUrlLoading(WebView,String) in WebViewClient has been deprecated
public boolean shouldOverrideUrlLoading(WebView view, String url) {
^
/usr/share/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-5.5.0/android/src/main/java/io/flutter/plugins/urllauncher/WebViewActivity.java:46: warning: [deprecation] shouldOverrideUrlLoading(WebView,String) in WebViewClient has been deprecated
return super.shouldOverrideUrlLoading(view, url);
^
2 warnings
Removed unused resources: Binary resource data reduced from 977KB to 907KB: Removed 7%
Running Gradle task 'assembleRelease'...
Running Gradle task 'assembleRelease'... Done 46.0s
✓ Built build/app/outputs/flutter-apk/app-release.apk (21.8MB).

Environment (please complete the following information):

• iOS? Version: ...
• Android? Version: ...
• Version of barcode_scan: barcode_scan: ^3.0.1
• Output of flutter --version:

Flutter 1.20.1 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 2ae34518b8 (2 weeks ago) • 2020-08-05 19:53:19 -0700
Engine • revision c8e3b94853
Tools • Dart 2.9.0

• Output of flutter doctor -v

flutter doctor -v
[✓] Flutter (Channel stable, 1.20.1, on Linux, locale en_US.UTF-8)
    • Flutter version 1.20.1 at /usr/share/flutter
    • Framework revision 2ae34518b8 (2 weeks ago), 2020-08-05 19:53:19 -0700
    • Engine revision c8e3b94853
    • Dart version 2.9.0

 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at /home/lukaskurz/Android/Sdk
    • Platform android-29, build-tools 29.0.3
    • Java binary at: /usr/share/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)
    • All Android licenses accepted.

[✓] Android Studio (version 3.6)
    • Android Studio at /usr/share/android-studio
    • Flutter plugin version 45.0.1
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[✓] VS Code (version 1.47.3)
    • VS Code at /usr/share/code
    • Flutter extension version 3.13.2

Additional context
Add any other context about the problem here.