creating android project files

android/app/build.gradle.kts

@@ -0,0 +1,67 @@
+plugins {
+    id("com.android.application")
+}
+
+android {
+    namespace = "com.critterfolio.app"
+    compileSdk = 34
+    ndkVersion = "26.3.11579264"
+
+    defaultConfig {
+        applicationId = "com.critterfolio.app"
+        minSdk = 24
+        targetSdk = 34
+        versionCode = 1
+        versionName = "0.1.0"
+
+        ndk {
+            abiFilters += listOf("arm64-v8a")
+        }
+
+        externalNativeBuild {
+            cmake {
+                arguments += "-DANDROID_STL=c++_shared"
+                cppFlags += "-std=c++17"
+            }
+        }
+    }
+
+    buildFeatures {
+        prefab = true
+    }
+
+    externalNativeBuild {
+        cmake {
+            path = file("CMakeLists.txt")
+            version = "3.22.1"
+        }
+    }
+
+    sourceSets {
+        getByName("main") {
+            assets.srcDirs("../../assets")
+        }
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    packaging {
+        jniLibs {
+            useLegacyPackaging = true
+        }
+    }
+}
+
+dependencies {
+    implementation(files("libs/SDL3-3.4.14.aar"))
+    implementation(files("libs/SDL3_image-3.4.4.aar"))
+}

android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-feature android:glEsVersion="0x00030000" android:required="true" />
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:label="Critterfolio"
+        android:hasCode="true">
+
+        <activity
+            android:name="com.critterfolio.app.MainActivity"
+            android:label="Critterfolio"
+            android:configChanges="orientation|screenSize|keyboardHidden"
+            android:exported="true"
+            android:screenOrientation="fullSensor">
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

android/app/src/main/java/com/critterfolio/app/MainActivity.java

@@ -0,0 +1,13 @@
+package com.critterfolio.app;
+
+import org.libsdl.app.SDLActivity;
+
+public class MainActivity extends SDLActivity {
+    @Override
+    protected String[] getLibraries() {
+        return new String[] {
+            "SDL3",
+            "critterfolio"
+        };
+    }
+}

android/build.gradle.kts

@@ -0,0 +1,3 @@
+plugins {
+    id("com.android.application") version "8.5.2" apply false
+}

android/gradle.properties

@@ -0,0 +1,2 @@
+org.gradle.jvmargs=-Xmx2048m
+android.useAndroidX=true

android/settings.gradle.kts

@@ -0,0 +1,17 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "critterfolio"
+include(":app")

flake.nix

@@ -9,7 +9,13 @@
   outputs = { self, nixpkgs, utils }:
     utils.lib.eachDefaultSystem (system:
       let
-        pkgs = import nixpkgs { inherit system; };
+        pkgs = import nixpkgs {
+          inherit system;
+          config = {
+            allowUnfree = true;
+            android_sdk.accept_license = true;
+          };
+        };
 
         rmlui = pkgs.stdenv.mkDerivation rec {
           pname = "rmlui";
@@ -66,10 +72,31 @@
           sqlitecpp
           toml11
         ];
+
+        ndkVersion = "26.3.11579264";
+
+        androidComposition = pkgs.androidenv.composeAndroidPackages {
+          platformVersions = [ "34" ];
+          buildToolsVersions = [ "34.0.0" ];
+          includeNDK = true;
+          ndkVersions = [ ndkVersion ];
+          abiVersions = [ "arm64-v8a" ];
+          includeEmulator = false;
+        };
+
+        androidSdkRoot = "${androidComposition.androidsdk}/libexec/android-sdk";
+        androidNdkRoot = "${androidSdkRoot}/ndk/${ndkVersion}";
+
+        androidDeps = [
+          androidComposition.androidsdk
+          pkgs.gradle
+          pkgs.jdk17
+          pkgs.ninja
+        ];
       in
       {
         devShells.default = pkgs.mkShell {
-          nativeBuildInputs = buildDeps;
+          nativeBuildInputs = buildDeps ++ androidDeps;
           buildInputs = runtimeDeps;
 
           shellHook = ''
@@ -77,7 +104,12 @@
             export LIBRARY_PATH="${pkgs.libGL}/lib:${rmlui}/lib"
             export LD_LIBRARY_PATH="$LIBRARY_PATH:$LD_LIBRARY_PATH"
 
-            echo "Env ready"
+            export ANDROID_HOME="${androidSdkRoot}"
+            export ANDROID_SDK_ROOT="${androidSdkRoot}"
+            export ANDROID_NDK_HOME="${androidNdkRoot}"
+            export ANDROID_NDK_ROOT="${androidNdkRoot}"
+
+            echo "Env ready (desktop + Android NDK ${ndkVersion}, arm64-v8a)"
           '';
         };