fix: build Android against the devbox-managed JDK and NDK

app/android/.gitignore

@@ -1,5 +1,6 @@
 gradle-wrapper.jar
 /.gradle
+/build
 /captures/
 /gradlew
 /gradlew.bat

app/android/app/build.gradle.kts

@@ -8,7 +8,10 @@ plugins {
 android {
     namespace = "page.mews.mews"
     compileSdk = flutter.compileSdkVersion
-    ndkVersion = flutter.ndkVersion
+    // The devbox-managed SDK ships this NDK and is read-only, so Gradle
+    // cannot install the Flutter default beside it; the version is pinned to
+    // what nix-android-sdk provides.
+    ndkVersion = "27.0.12077973"
 
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17

app/android/build.gradle.kts

@@ -19,6 +19,25 @@ subprojects {
     project.evaluationDependsOn(":app")
 }
 
+// The devbox-managed SDK ships one NDK and is read-only, so Gradle can never
+// install another beside it. Plugin build scripts ask for Flutter's default
+// NDK, which the SDK does not carry; every project is therefore pinned to
+// the one it does. Matches the app's own pin in app/build.gradle.kts.
+gradle.afterProject {
+    // The devbox-managed SDK ships one NDK and is read-only, so Gradle can
+    // never install another beside it. Plugin build scripts ask for
+    // Flutter's default NDK, which the SDK does not carry; every project
+    // is therefore pinned to the one it does, as the app itself is.
+    val android = extensions.findByName("android") ?: return@afterProject
+    try {
+        android::class.java
+            .getMethod("setNdkVersion", String::class.java)
+            .invoke(android, "27.0.12077973")
+    } catch (_: NoSuchMethodException) {
+        // Nothing to pin.
+    }
+}
+
 tasks.register<Delete>("clean") {
     delete(rootProject.layout.buildDirectory)
 }

devbox.json

@@ -2,6 +2,7 @@
   "$schema": "https://raw.githubusercontent.com/jetify-com/devbox/main/schema/schemas/devbox.schema.json",
   "packages": {
     "flutter@3.41.9-sdk-links": {},
+    "nixpkgs#openjdk17": {},
     "path:./nix-android-sdk#android-sdk": {},
     "gtk3": {},
     "clang": {},
@@ -10,10 +11,15 @@
     "pkg-config": {},
     "patchelf": {}
   },
+  "env": {
+    "ANDROID_HOME": "$DEVBOX_PACKAGES_DIR/share/android-sdk",
+    "ANDROID_SDK_ROOT": "$DEVBOX_PACKAGES_DIR/share/android-sdk"
+  },
   "shell": {
     "init_hook": [
       "export PKG_CONFIG_PATH=\"$PWD/.devbox/nix/profile/default/lib/pkgconfig:$PKG_CONFIG_PATH\"",
-      "export LD_LIBRARY_PATH=\"$PWD/.devbox/nix/profile/default/lib:$LD_LIBRARY_PATH\""
+      "export LD_LIBRARY_PATH=\"$PWD/.devbox/nix/profile/default/lib:$LD_LIBRARY_PATH\"",
+      "flutter config --jdk-dir \"$(dirname \"$(dirname \"$(command -v java)\")\")\" > /dev/null"
     ],
     "scripts": {
       "analyze": "cd app && flutter analyze",

devbox.lock

@@ -69,6 +69,10 @@
       "resolved": "github:NixOS/nixpkgs/b6c8664de9b6cc07fe5666a29f91884ba81197c4?narHash=sha256-641r7xrlSOHYoktL9%2FaArPIYNgZJ9eM5URzSEOtPJDY%3D#ninja",
       "source": "nixpkg"
     },
+    "nixpkgs#openjdk17": {
+      "last_modified": "1970-01-01T00:00:00Z",
+      "resolved": "path:/nix/store/v8ynlbrldn7k8byb1kx0j0wka8dsbrw9-source?narHash=sha256-BZWCi9ZRJiARTuKTbbtvFTj7t1TK4G3UEckT3HyNfRg%3D#openjdk17"
+    },
     "patchelf": {
       "resolved": "github:NixOS/nixpkgs/b6c8664de9b6cc07fe5666a29f91884ba81197c4?narHash=sha256-641r7xrlSOHYoktL9%2FaArPIYNgZJ9eM5URzSEOtPJDY%3D#patchelf",
       "source": "nixpkg"