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Pin Android SDK components and aapt2 override for Flutter builds

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The Android SDK lives in the read-only Nix store, so the Gradle build
cannot auto-install missing components. Pin everything the Flutter
Android build needs in the dev shell's composeAndroidPackages:
platforms 33-36 (app targets 36; plugins pin 34 and 35), build-tools
35.0.0 (AGP 8.11.1), NDK 28.2.13676358 (flutter.ndkVersion), and
cmake 3.22.1 (plugin native builds).

Also redirect the Android Gradle Plugin to the Nix-patched aapt2 from
the SDK via android.aapt2FromMavenOverride, written to the user-global
~/.gradle/gradle.properties on shell entry (the project's tracked
gradle.properties must not contain a machine-specific store path).
AGP's Maven-downloaded aapt2 cannot run on NixOS.

Ignore the generated frontend/android/build/ directory.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
rzuasti
2026-06-02 20:49:28 -04:00
co-authored by Claude Opus 4.8
parent ada989c11b
commit 4924146075
2 changed files with 24 additions and 1 deletions
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flake.nix
+23 -1
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@@ -39,11 +39,17 @@
# available and reproducible across machines, instead of relying on the
# contents of the default androidPkgs bundle (which can drift over time).
androidComposition = pkgsBySystem.${system}.androidenv.composeAndroidPackages {
platformVersions = ["36"]; # matches Flutter 3.41 compileSdk/targetSdk
# 36 = Flutter 3.41 app compileSdk/targetSdk; 33-35 cover plugin subprojects
# which each pin their own compileSdk (e.g. package_info_plus -> 34, jni -> 35).
platformVersions = ["33" "34" "35" "36"];
buildToolsVersions = ["35.0.0"]; # required by Android Gradle Plugin 8.11.1
includeEmulator = true;
includeSystemImages = true;
systemImageTypes = ["google_apis"];
abiVersions = ["x86_64"];
includeNDK = true;
ndkVersions = ["28.2.13676358"]; # matches Flutter 3.41 flutter.ndkVersion
cmakeVersions = ["3.22.1"]; # required by plugin native (externalNativeBuild) tasks
};
in {
default = pkgsBySystem.${system}.mkShell rec {
@@ -87,6 +93,22 @@
|| echo " WARNING: failed to create Android emulator '$ANDROID_AVD_NAME'."
fi
# Point the Android Gradle Plugin at the Nix-patched aapt2 shipped in
# the SDK build-tools. AGP otherwise downloads a prebuilt aapt2 from
# Maven that cannot run on NixOS (its ELF interpreter is missing).
# We write this to the user-global Gradle properties because the
# project's android/gradle.properties is version-controlled and must
# not contain a machine-specific Nix store path. The managed block is
# rewritten on every entry so it tracks the pinned SDK store path.
aapt2Bin="$(ls "$ANDROID_SDK_ROOT"/build-tools/*/aapt2 2>/dev/null | sort | tail -n1)"
if [ -n "$aapt2Bin" ]; then
mkdir -p "$HOME/.gradle"
gradleProps="$HOME/.gradle/gradle.properties"
touch "$gradleProps"
sed -i '/# >>> oott-nix >>>/,/# <<< oott-nix <<</d' "$gradleProps"
printf '# >>> oott-nix >>>\nandroid.aapt2FromMavenOverride=%s\n# <<< oott-nix <<<\n' "$aapt2Bin" >> "$gradleProps"
fi
DEV_SHELL=oott exec fish
'';
};