Add Android project

.github/workflows/main.yml

@@ -6,14 +6,12 @@ jobs:
   desktop:
     name: ${{ matrix.platform.name }}
     runs-on: ${{ matrix.platform.os }}
-
     strategy:
       matrix:
         platform:
         - { name: Linux,   os: ubuntu-latest }
         - { name: Windows, os: windows-latest }
         - { name: MacOS,   os: macos-latest }
-
     steps:
     - name: Set up SDL
       id: sdl
@@ -30,7 +28,6 @@ jobs:
   emscripten:
     name: Emscripten
     runs-on: ubuntu-latest
-
     steps:
       - name: Get project sources
         uses: actions/checkout@v4
@@ -39,3 +36,19 @@ jobs:
         run: emcmake cmake -B build ${{ matrix.platform.flags }} -DDOWNLOAD_DEPENDENCIES=ON
       - name: Build (CMake)
         run: cmake --build build/
+
+  android:
+    name: Android
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get project sources
+        uses: actions/checkout@v4
+      - name: Download SDL3 Android Archive
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run:
+          gh -R libsdl-org/SDL release download preview-3.1.3 -D android-project/app/libs -p '*.aar'
+      - name: Build gradle project
+        run: |
+          cd android-project
+          ./gradlew -i assembleRelease

android-project/.gitignore

@@ -0,0 +1,3 @@
+.cxx
+.gradle
+local.properties

android-project/README.md

@@ -0,0 +1,37 @@
+# Gradle
+
+This folder contains a minimal Android gradle project that builds the SDL_helloworld application.
+Instead of building SDL3 itself, it uses a prebuilt SDL3.
+
+## FAQ
+
+## Where do I get a prebuilt SDL3 Android library?
+
+Prebuilt Android archives are part of SDL 3 releases as `.aar` archives.
+Download these and put them in the `app/libs` folder.
+
+## I downloaded a prebuilt SDL3 library, but it cannot find `SDL3-x.y.z.aar`
+
+In `app/build.gradle`, there is a line `implementation files('libs/SDL3-X.Y.Z.aar')`.
+You must download exactly SDL3 X.Y.Z, or modify `app/build.gradle` to the version of the library you downloaded.
+
+## How do I modify my Android project to use prebuilt SDL3 Android archives?
+
+Only 2 changes are required:
+
+1. Enable the prefab build feature:
+   ```gradle
+   android {
+       /* ... */
+       buildFeatures {
+           prefab true
+       }
+   }
+   ```
+2. Add the downloaded Android archive to your dependencies:
+   ```gradle
+   dependencies {
+     /* ... */      
+     implementation files('libs/SDL3-3.1.3.aar')
+   }
+   ```

android-project/app/build.gradle

@@ -0,0 +1,48 @@
+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 33
+
+    defaultConfig {
+        applicationId 'org.libsdl.SDL_Helloworld'
+        minSdk 21
+        targetSdk 33
+        versionCode 1
+        versionName '1.0'
+
+        externalNativeBuild {
+            cmake {
+                arguments '-DANDROID_STL=c++_shared', '-DDOWNLOAD_DEPENDENCIES=OFF'
+                abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
+                // abiFilters 'arm64-v8a'
+            }
+        }
+    }
+
+    externalNativeBuild {
+        cmake {
+            path '../../CMakeLists.txt'
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    buildFeatures {
+        prefab true
+    }
+}
+
+dependencies {
+    implementation files('libs/SDL3-3.1.3.aar')
+    implementation 'androidx.appcompat:appcompat:1.5.1'
+}

android-project/app/libs/copy-sdl-aars-here.txt

@@ -0,0 +1 @@
+Copy SDL3 Android Archives (.aar files) here.

android-project/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

android-project/app/src/main/AndroidManifest.xml

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="org.libsdl.helloworld">
+
+    <!-- OpenGL ES 2.0 -->
+    <uses-feature android:glEsVersion="0x00020000" />
+
+    <!-- Touchscreen support -->
+    <uses-feature
+        android:name="android.hardware.touchscreen"
+        android:required="false" />
+
+    <!-- Game controller support -->
+    <uses-feature
+        android:name="android.hardware.bluetooth"
+        android:required="false" />
+    <uses-feature
+        android:name="android.hardware.gamepad"
+        android:required="false" />
+    <uses-feature
+        android:name="android.hardware.usb.host"
+        android:required="false" />
+
+    <!-- External mouse input events -->
+    <uses-feature
+        android:name="android.hardware.type.pc"
+        android:required="false" />
+
+    <!-- Allow access to the vibrator -->
+    <uses-permission android:name="android.permission.VIBRATE" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:hardwareAccelerated="true"
+        tools:targetApi="31">
+        <activity
+            android:name="org.libsdl.helloworld.HelloWorldActivity"
+            android:exported="true"
+            android:label="@string/app_name"
+            android:configChanges="layoutDirection|locale|orientation|uiMode|screenLayout|screenSize|smallestScreenSize|keyboard|keyboardHidden|navigation"
+            android:preferMinimalPostProcessing="true"
+            android:screenOrientation="fullSensor">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

android-project/app/src/main/java/org/libsdl/helloworld/HelloWorldActivity.java

@@ -0,0 +1,9 @@
+package org.libsdl.helloworld;
+
+import org.libsdl.app.SDLActivity;
+
+public class HelloWorldActivity extends SDLActivity {
+    protected String[] getLibraries() {
+        return new String[] { "SDL3", "sdl-helloworld" };
+    }
+}

android-project/app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>