Flutter Install Gradle Issues - gradle

Question

I'm trying to get a basic hello world project running using flutter. These are the steps that I have taken to install Flutter on a windows machine, running Window 10 Pro.
Downloaded flutter_windows_v0.9.4-beta.zip and extracted to c:\src\
Add location to environment settings ... C:\src\flutter
Downloaded and installed Android Studio and Setup an emulator using ADV Manager.
Downloaded and installed Visual Studio Code
Added Dart 2.19.0 Extension
Added Flutter 2.19.0 Extension
Run Flutter doctor
[flutter] flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel beta, v0.9.4, on Microsoft Windows [Version 10.0.15063], locale en-GB)
[√] Android toolchain - develop for Android devices (Android SDK 28.0.3)
[√] Android Studio (version 3.2)
X Flutter plugin not installed; this adds Flutter specific functionality.
X Dart plugin not installed; this adds Dart specific functionality.
[√] VS Code (version 1.28.2)
[√] Connected devices (1 available)
Create a new flutter project
Deleted code under Test folder
Replaced code in main.dart with ...
import 'package:flutter/material.dart';
void main() {
runApp(Center(
child: Text(
"this is a test",
textDirection: TextDirection.ltr,
),
));
}
Ran project and get the following error ...
Launching lib\main.dart on Android SDK built for x86 in debug mode...
* Error running Gradle:
Exit code 1 from: C:\Users\to0589\Desktop\flutter projects\asad\android\gradlew.bat app:properties:
Project evaluation failed including an error in afterEvaluate {}. Run with --stacktrace for details of the afterEvaluate {} error.
FAILURE: Build failed with an exception.
* Where:
Build file 'C:\Users\to0589\Desktop\flutter projects\asad\android\app\build.gradle' line: 25
* What went wrong:
A problem occurred evaluating project ':app'.
> Could not resolve all files for configuration 'classpath'.
> Could not find lint-gradle-api.jar (com.android.tools.lint:lint-gradle-api:26.1.2).
Searched in the following locations:
https://jcenter.bintray.com/com/android/tools/lint/lint-gradle-api/26.1.2/lint-gradle-api-26.1.2.jar
* 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 1s
Please review your Gradle project setup in the android/ folder.
Exited (sigterm)
Can anyone tell me where I went wrong please Any assistance greatly appreciated.

Answer 1

That's not a problem in your install. This is a problem that many people are facing with current flutter version.
It's already fixed. However, it's not yet released to the most stable version.
If you change the flutter channel to master, you'll see that it will run normally.
You can use the master channel for now and then switch it back to dev.
flutter channel master
flutter upgrade
# to see all the channels, run
flutter channel

Answer 2

https://github.com/flutter/flutter/pull/23397
In short, following Mahi-K from the above link, you have to edit $flutterRoot/packages/flutter_tools/gradle/flutter.gradle
buildscript {
repositories {
google()
jcenter()
maven {
url 'https://dl.google.com/dl/android/maven2'
}
}
dependencies {
classpath 'com.android.tools.build:gradle:3.2.1'
}
}
In the gradle wrapper properties gradle/wrapper/gradle-wrapper.properties you may also have to change it to 4.6 or above
distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip

Answer 3

Open the root flutter folder in your computer, and open the gradle folder in that root folder (For example C:\flutter\package\flutter_tool\gradle) and add 'google()' to the buildscript. It fixed the issue for me.
flutter root folder:
Add 'google()' in the buildscript:

Answer 4

update flutter or use one of the previous version of gradle by changing the class path in this section.
buildscript {
repositories {
google()
jcenter()
maven {
url 'https://dl.google.com/dl/android/maven2'
}
}
dependencies {
classpath 'com.android.tools.build:gradle:3.2.1'
}}