Flutter build APK results in "resource android:attr/fontVariationSettings not found" - android-studio

Question

I'm trying to create a signed APK in Flutter with Android Studio, in theory I already have all the steps ready to create the signed APK "https://flutter.dev/docs/deployment/android" but an error always pops up that prevents the apk from being created.
C:\Users\CryptoBrain\Desktop\app-Flutter\my_app>flutter build apk
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
Running Gradle task 'assembleRelease'...
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':clipboard_manager:verifyReleaseResources'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
> 1 exception was raised by workers:
com.android.builder.internal.aapt.v2.Aapt2Exception: Android resource linking failed
C:\Users\CryptoBrain\.gradle\caches\transforms-2\files-2.1\6c261a14fef7a6c9650e745991e1078b\core-1.1.0\res\values\values.xml:142:5-173:25: AAPT: error: resource android:attr/fontVar
iationSettings not found.
C:\Users\CryptoBrain\.gradle\caches\transforms-2\files-2.1\6c261a14fef7a6c9650e745991e1078b\core-1.1.0\res\values\values.xml:142:5-173:25: AAPT: error: resource android:attr/ttcInde
x not found.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 10m 59s
Running Gradle task 'assembleRelease'... 665,6s (!)
The built failed likely due to AndroidX incompatibilities in a plugin. The tool is about to try using Jetfier to solve the incompatibility.
Building plugin clipboard_manager...
Running Gradle task 'assembleAarRelease'... 59,7s
√ Built build\app\outputs\repo.
Building plugin majascan...
Running Gradle task 'assembleAarRelease'... 36,6s
√ Built build\app\outputs\repo.
Building plugin shared_preferences...
Running Gradle task 'assembleAarRelease'... 1,4s
Exception in thread "main" java.lang.NullPointerException
at org.gradle.wrapper.BootstrapMainStarter.findLauncherJar(BootstrapMainStarter.java:34)
at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:25)
at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
The plugin shared_preferences could not be built due to the issue above.
C:\Users\CryptoBrain\Desktop\app-Flutter\my_app>
I already tried using the different versions of clipboard_manager there are 4 but they all give the same error.
Also change the com.android.tools.build:gradle:3.5.0 to com.android.tools.build:gradle:3.6.1 and the distributionUrl I have it in: https://services.gradle.org/distributions/gradle-5.6.4-all.zip
Here is the code I am using:
pubspec.yaml
name: app_name
description: my flutter app
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
version: 1.0.0+1
environment:
sdk: ">=2.7.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.3
flutter_screenutil: ^0.5.3
carousel_pro: ^0.0.13
flutter_sparkline: ^0.1.0
font_awesome_flutter: ^8.4.0
shimmer: ^0.0.6
rxdart: ^0.21.0
bmnav: ^0.3.4
carousel_slider: ^1.3.0
percent_indicator: ^1.0.15
flutter_spinkit: ^4.1.1+1
http: 0.12.0+4
shared_preferences: ^0.5.12+4
pin_code_fields: ^3.0.0
url_launcher: ^5.4.5
provider: ^4.0.1
clipboard_manager: ^0.0.4
aes_crypt: ^0.1.1
mvc_pattern: ^5.1.1
encrypt: any
majascan: ^0.3.7
flutter_launcher_icons: ^0.7.5
dev_dependencies:
flutter_test:
sdk: flutter
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
flutter_icons:
image_path: "assets/image/logo.png"
ios: true
android: true
# The following section is specific to Flutter.
flutter:
# The following line ensures that the Material Icons font is
# included with your application, so that you can use the icons in
# the material Icons class.
uses-material-design: true
fonts:
- family: gainers
fonts:
- asset: assets/icon/ic_gainers.ttf
- family: message
fonts:
- asset: assets/icon/ic_message.ttf
- family: tab
fonts:
- asset: assets/icon/ic_tab.ttf
- family: wallet
fonts:
- asset: assets/icon/ic_wallet.ttf
- family: tab1
fonts:
- asset: assets/icon/ic_tab1.ttf
- family: tab2
fonts:
- asset: assets/icon/ic_tab2.ttf
- family: tab3
fonts:
- asset: assets/icon/ic_tab3.ttf
- family: tab4
fonts:
- asset: assets/icon/ic_tab4.ttf
- family: tab5
fonts:
- asset: assets/icon/ic_tab5.ttf
- family: loser
fonts:
- asset: assets/icon/ic_loser.ttf
- family: Sans
fonts:
- asset: assets/font/OpenSans-Bold.ttf
weight: 800
- asset: assets/font/OpenSans-Semibold.ttf
weight: 600
- asset: assets/font/OpenSans-Regular.ttf
weight: 400
- asset: assets/font/OpenSans-Light.ttf
weight: 200
- family : Popins
fonts:
- asset: assets/font/Poppins-Regular.ttf
weight: 400
- asset: assets/font/Poppins-SemiBold.ttf
weight : 600
- family : Berlin
fonts:
- asset: assets/font/BRLNSDB.TTF
weight: 700
- family : Lemon
fonts:
- asset: assets/font/Lemon-Regular.ttf
weight: 400
- family : Gotik
fonts:
- asset: assets/font/GOTHIC.TTF
weight: 400
- asset: assets/font/GOTHICB.TTF
weight : 600
- family : Pragmatica
fonts:
- asset: assets/font/pragmatica_bold.ttf
weight: 500
assets:
- assets/font/BRLNSDB.TTF
- assets/font/GOTHIC.TTF
- assets/font/GOTHICB.TTF
- assets/font/Lemon-Regular.ttf
- assets/font/OpenSans-Bold.ttf
- assets/font/OpenSans-Light.ttf
- assets/font/OpenSans-Regular.ttf
- assets/font/OpenSans-Semibold.ttf
- assets/font/Poppins-Regular.ttf
- assets/font/Poppins-SemiBold.ttf
- assets/font/pragmatica-bold.ttf
- assets/font/pragmatica.ttf
- assets/font/pragmatica_bold.ttf
- assets/icon/ic_gainers.ttf
- assets/icon/ic_loser.ttf
- assets/icon/ic_message.ttf
- assets/icon/ic_tab.ttf
- assets/icon/ic_tab1.ttf
- assets/icon/ic_tab2.ttf
- assets/icon/ic_tab3.ttf
- assets/icon/ic_tab4.ttf
- assets/icon/ic_tab5.ttf
- assets/icon/ic_wallet.ttf
- assets/image/
- assets/image/market/
- assets/image/logo.png
# To add assets to your application, add an assets section, like this:
# assets:
# - images/a_dot_burr.jpeg
# - images/a_dot_ham.jpeg
# An image asset can refer to one or more resolution-specific "variants", see
# https://flutter.dev/assets-and-images/#resolution-aware.
# For details regarding adding assets from package dependencies, see
# https://flutter.dev/assets-and-images/#from-packages
# To add custom fonts to your application, add a fonts section here,
# in this "flutter" section. Each entry in this list should have a
# "family" key with the font family name, and a "fonts" key with a
# list giving the asset and other descriptors for the font. For
# example:
# fonts:
# - family: Schyler
# fonts:
# - asset: fonts/Schyler-Regular.ttf
# - asset: fonts/Schyler-Italic.ttf
# style: italic
# - family: Trajan Pro
# fonts:
# - asset: fonts/TrajanPro.ttf
# - asset: fonts/TrajanPro_Bold.ttf
# weight: 700
#
# For details regarding fonts from package dependencies,
# see https://flutter.dev/custom-fonts/#from-packages
file app/build.gradle:
def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
localPropertiesFile.withReader('UTF-8') { reader ->
localProperties.load(reader)
}
}
def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}
def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
flutterVersionCode = '1'
}
def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
flutterVersionName = '1.0'
}
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}
android {
compileSdkVersion 28
buildToolsVersion '28.0.3'
aaptOptions.cruncherEnabled = false
aaptOptions.useNewCruncher = false
sourceSets {
main.java.srcDirs += 'src/main/kotlin'
}
lintOptions {
disable 'InvalidPackage'
}
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId "com.flutter.app"
minSdkVersion 16
targetSdkVersion 28
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
}
signingConfigs {
release {
keyAlias keystoreProperties['keyAlias']
keyPassword keystoreProperties['keyPassword']
storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
storePassword keystoreProperties['storePassword']
}
}
buildTypes {
release {
// TODO: Add your own signing config for the release build.
// Signing with the debug keys for now, so `flutter run --release` works.
signingConfig signingConfigs.release
}
}
}
flutter {
source '../..'
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}
File android/build.gradle
buildscript {
ext.kotlin_version = '1.4.21'
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.6.1'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
allprojects {
repositories {
google()
jcenter()
}
}
rootProject.buildDir = '../build'
subprojects {
project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
project.evaluationDependsOn(':app')
}
task clean(type: Delete) {
delete rootProject.buildDir
}
How can I fix this?

Answer 1

I was also getting that kind of error but instead, I KNOW ANOTHER WAY.
Step 01: Open your flutter Android app in another android studio. If you don't know how? Just open build.gradle in the android section of the flutter app. Then at the top corner, you will find Open for Editing in Android Studio.
Step 02: Once a new Window of Android Studio opens. Let the Gradle Build complete. Once it's done go to the Build tab at the top of Android Studio
Step 03: It will open a dialog box and you will figure out what to do next. It's really convenient and easy way.

Answer 2

Inside the android/app/build.gradle under configuration, to resolve the issue
android{
configurations.all {
resolutionStrategy {
force 'com.android.support:support-v4:27.1.0'
}
}
}