Flutter incompatible with Android Gradle Kotlin DSL #33762
Description
Steps to Reproduce
- Create new Flutter Android app.
- Mitgrate Gradle build scripts to Kotlin scripts (
build.gradle->build.gradle.kts) - Run
flutter run
Logs
> flutter run
Launching lib/main.dart on Pixel 2 in debug mode...
No application found for TargetPlatform.android_arm64.
Is your project missing an android\AndroidManifest.xml?
Consider running "flutter create ." to create one.
> flutter analyze
Analyzing sudoku...
No issues found! (ran in 2.2s)
> flutter doctor -v
[√] Flutter (Channel stable, v1.5.4-hotfix.2, on Microsoft Windows [Version 10.0.17134.765], locale de-DE)
• Flutter version 1.5.4-hotfix.2 at C:\Users\kiese\AppData\Local\flutter
• Framework revision 7a4c33425d (5 weeks ago), 2019-04-29 11:05:24 -0700
• Engine revision 52c7a1e849
• Dart version 2.3.0 (build 2.3.0-dev.0.5 a1668566e5)
[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at C:\Users\kiese\AppData\Local\Android\sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• Java binary at: C:\Users\kiese\AppData\Local\JetBrains\Toolbox\apps\AndroidStudio\ch-0\183.5522156\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
• All Android licenses accepted.
[√] Android Studio (version 3.4)
• Android Studio at C:\Users\kiese\AppData\Local\JetBrains\Toolbox\apps\AndroidStudio\ch-0\183.5522156
• Flutter plugin version 36.0.1
• Dart plugin version 183.6270
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
[√] IntelliJ IDEA Ultimate Edition (version 2019.1)
• IntelliJ at C:\Users\kiese\AppData\Local\JetBrains\Toolbox\apps\IDEA-U\ch-0\191.7479.19
• Flutter plugin version 35.3.3
• Dart plugin version 191.7221
[√] VS Code, 64-bit edition (version 1.34.0)
• VS Code at C:\Program Files\Microsoft VS Code
• Flutter extension version 3.0.2
[√] Connected device (1 available)
• Pixel 2 • FA7A61A10729 • android-arm64 • Android 9 (API 28)
• No issues found!
Possible Causes
When Flutter tries to run the application, it detects, the device is an Android phone.
Then it creates an instance of an AndroidProject.
In the AndroidProject multiple times the assertion is made, that a Gradle project must have a build.gradle file. This assertion is wrong, as Gradle projects can also use the Kotlin DSL, hence use a build.gradle.kts file.
Occurrences to be fixed.
flutter/packages/flutter_tools/lib/src/project.dart
Lines 502 to 504 in d0e45a2
flutter/packages/flutter_tools/lib/src/project.dart
Lines 506 to 509 in d0e45a2
flutter/packages/flutter_tools/lib/src/project.dart
Lines 511 to 514 in d0e45a2
Generally the current approach using Regexes to check the Android project properties is very error-prone. We might investigate whether there are better alternatives.
Workaround
For now you can fix the build by include a build.gradle file referencing the build.gradle.kts file:
apply from: "build.gradle.kts"This will work around the check in isUsingGradle, but won't fix the other occurences.