Switch to gradle based build for Android CI

Author: ShikenNuggets

.github/workflows/cmake-multi-platform.yml

@@ -82,15 +82,21 @@ jobs:
     steps:
     - uses: actions/checkout@v6
 
-    - name: Configure CMake
-      run: >
-        cmake -B build
-        -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK_LATEST_HOME/build/cmake/android.toolchain.cmake
-        -DANDROID_ABI=${{ matrix.abi }}
-        -DANDROID_PLATFORM=android-21
-        -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
-        -DSDL_UNIX_CONSOLE_BUILD=ON
-        -S .
+    - name: Setup JDK 17
+      uses: actions/setup-java@v5
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+        cache: 'gradle'
 
-    - name: Build
-      run: cmake --build build --config ${{ matrix.build_type }}
+    - name: Setup Android SDK
+      uses: android-actions/setup-android@v4
+
+    - name: Grant execute permission for gradlew
+      run: chmod +x android/gradlew
+
+    - name: Buld APK with Gradle
+      run: ./gradlew assembleRelease
+      working-directory: android
+      env:
+        ANDROID_NDK_HOME: ${{ env.ANDROID_NDK_HOME }}