Problem building flutter app for android

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1

Whenever I run flutter build apk, I get:

Running Gradle task 'assembleRelease'...                        

FAILURE: Build failed with an exception.

* Where:
Build file '/home/micycle/Documents/Dart/wordpair/android/app/build.gradle' line: 4

* What went wrong:
Error resolving plugin [id: 'dev.flutter.flutter-gradle-plugin', version: '1.0.0']
> A problem occurred configuring project ':gradle'.
   > Could not create service of type OutputFilesRepository using ExecutionGradleServices.createOutputFilesRepository().
      > Failed to create parent directory '/nix/store/jc032k4vpl3p5l37bl65a2649flqqybh-flutter-3.13.8-unwrapped/packages/flutter_tools/gradle/.gradle' when creating directory '/nix/store/jc032k4vpl3p5l37bl65a2649flqqybh-flutter-3.13.8-unwrapped/packages/flutter_tools/gradle/.gradle/buildOutputCleanup'

* Try:
> Run with --stacktrace option to get the stack trace.
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* Get more help at https://help.gradle.org

BUILD FAILED in 1s
Running Gradle task 'assembleRelease'...                         2,775ms
Gradle task assembleRelease failed with exit code 1

I’m not quite sure why gradle is trying to make a folder in such a weird spot, nor do I know how to fix it.

The following is my flake.nix:

{
description = "Flutter 3.13.x";
inputs = {
  nixpkgs.url = "nixpkgs/nixos-unstable";
  flake-utils.url = "github:numtide/flake-utils";
};
outputs = { self, nixpkgs, flake-utils }:
  flake-utils.lib.eachDefaultSystem (system:
    let
      pkgs = import nixpkgs {
        inherit system;
        config = {
          android_sdk.accept_license = true;
          allowUnfree = true;
        };
      };
      buildToolsVersion = "34.0.0-rc4";
      androidComposition = pkgs.androidenv.composeAndroidPackages {
        buildToolsVersions = [ buildToolsVersion "28.0.3" ];
        platformVersions = [ "34" "28" ];
        abiVersions = [ "armeabi-v7a" "arm64-v8a" ];
        includeEmulator = true;
        emulatorVersion = "34.1.9";
      };
      androidSdk = androidComposition.androidsdk;
    in
    {
      devShell =
        with pkgs; mkShell rec {
          ANDROID_SDK_ROOT = "${androidSdk}/libexec/android-sdk";
          GRADLE_OPTS = "-Dorg.gradle.project.android.aapt2FromMavenOverride=${androidSdk}/libexec/android-sdk/build-tools/31.0.0/aapt2";
          buildInputs = [
            flutter

            androidSdk
            jdk17

            xorg.libX11
          ];
        };
    });
}
2

Hello !

For me, the issue came from the android/app/build.gradle file generated by the latest version of Flutter.

By modifying it so that it looks like the file generated by an older version, the issue disappears.

After applying the changes, the beginning of the file looks like this to me:

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"

android {
    // ...

And here is what it looked like before:

plugins {
    id "com.android.application"
    id "kotlin-android"
    id "dev.flutter.flutter-gradle-plugin"
}

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

android {
    // ...

I’m not sure what the real issue is, but I hope this helps!

Have a nice day!