Failed to build release for Android devices. No issue on iOS devices.

[zinwalin]

RMBP➜ FlutterCinematic git:(master) ✗ >flutter run -d all --release
Running "flutter packages get" in FlutterCinematic... 0.5s
Initializing gradle... 0.9s
Resolving dependencies... 1.8s
Launching lib/main.dart on MI 6 in release mode...
Running 'gradlew assembleRelease'...
VMIsolate(CodeSize): 4613
Isolate(CodeSize): 1699574
ReadOnlyData(CodeSize): 2484048
Instructions(CodeSize): 5880224
Total(CodeSize): 10068459
Gradle build failed to produce an Android package.

[zinwalin]

verbose:

[ +419 ms] "flutter run" took 9,906ms.
Gradle build failed to produce an Android package.

#0 throwToolExit (package:flutter_tools/src/base/common.dart:28)
#1 _buildGradleProjectV2 (package:flutter_tools/src/android/gradle.dart:408)

#2 buildGradleProject (package:flutter_tools/src/android/gradle.dart:318)

#3 buildApk (package:flutter_tools/src/android/apk.dart:36)

#4 AndroidDevice.startApp (package:flutter_tools/src/android/android_device.dart:377)

#5 FlutterDevice.runCold (package:flutter_tools/src/resident_runner.dart:349)

#6 ColdRunner.run (package:flutter_tools/src/run_cold.dart:54)

#7 RunCommand.runCommand (package:flutter_tools/src/commands/run.dart:395)

#8 FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:344)

#9 FlutterCommand.run. (package:flutter_tools/src/runner/flutter_command.dart:279)

#10 AppContext.run. (package:flutter_tools/src/base/context.dart:142)

#11 _rootRun (dart:async/zone.dart:1126)
#12 _CustomZone.run (dart:async/zone.dart:1023)
#13 runZoned (dart:async/zone.dart:1501)
#14 AppContext.run (package:flutter_tools/src/base/context.dart:141)

#15 FlutterCommand.run (package:flutter_tools/src/runner/flutter_command.dart:270)
#16 CommandRunner.runCommand (package:args/command_runner.dart:194)

#17 FlutterCommandRunner.runCommand. (package:flutter_tools/src/runner/flutter_command_runner.dart:309)

#18 AppContext.run. (package:flutter_tools/src/base/context.dart:142)

#19 _rootRun (dart:async/zone.dart:1126)
#20 _CustomZone.run (dart:async/zone.dart:1023)
#21 runZoned (dart:async/zone.dart:1501)
#22 AppContext.run (package:flutter_tools/src/base/context.dart:141)

#23 FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:265)

#24 CommandRunner.run. (package:args/command_runner.dart:109)
#25 new Future.sync (dart:async/future.dart:222)
#26 CommandRunner.run (package:args/command_runner.dart:109)
#27 FlutterCommandRunner.run (package:flutter_tools/src/runner/flutter_command_runner.dart:174)
#28 run. (package:flutter_tools/runner.dart:59)

#29 AppContext.run. (package:flutter_tools/src/base/context.dart:142)

#30 _rootRun (dart:async/zone.dart:1126)
#31 _CustomZone.run (dart:async/zone.dart:1023)
#32 runZoned (dart:async/zone.dart:1501)
#33 AppContext.run (package:flutter_tools/src/base/context.dart:141)

#34 runInContext (package:flutter_tools/src/context_runner.dart:43)

#35 run (package:flutter_tools/runner.dart:50)
#36 main (package:flutter_tools/executable.dart:49)

#37 main (file:///Users/michael/Development/flutter/packages/flutter_tools/bin/flutter_tools.dart:8)
#38 _startIsolate. (dart:isolate-patch/dart:isolate/isolate_patch.dart:277)
#39 _RawReceivePortImpl._handleMessage (dart:isolate-patch/dart:isolate/isolate_patch.dart:165)

[amit-bhandari]

I faced the same issue.

I was able to successfully create debug package by giving 'flutter build apk --debug'

For creating release build, I created key.jks (followed this doc https://flutter.io/android-release/ ) and voilla, got the release apk.