add android build ci

.github/workflows/calc-android.yml

@@ -0,0 +1,82 @@
+name: Build and release calculator for Android
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build APK
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+               clang \
+               cmake \
+               curl \
+               gcc-multilib \
+               git \
+               g++ \
+               g++-multilib \
+               libappindicator3-dev \
+               libasound2-dev \
+               libc6-dev \
+               libclang-10-dev \
+               libclang-dev \
+               libgstreamer1.0-dev \
+               libgstreamer-plugins-base1.0-dev \
+               libgtk-3-dev \
+               libpam0g-dev \
+               libpulse-dev \
+               libva-dev \
+               libvdpau-dev \
+               libxcb-randr0-dev \
+               libxcb-shape0-dev \
+               libxcb-xfixes0-dev \
+               libxdo-dev \
+               libxfixes-dev \
+               llvm-10-dev \
+               llvm-dev \
+               nasm \
+               ninja-build \
+               openjdk-11-jdk-headless \
+               pkg-config \
+               tree \
+               wget
+      - uses: actions/checkout@v4
+      - name: Install flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: "stable"
+          flutter-version:  3.16.3
+      - uses: nttld/setup-ndk@v1
+        id: setup-ndk
+        with:
+          ndk-version: "r26b"
+          add-to-path: true
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: 1.75
+          components: "rustfmt"
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          prefix-key: rustdesk-lib-cache-android
+          key: aarch64-linux-android
+
+      - name: Build
+        env:
+          JAVA_HOME: /usr/lib/jvm/java-11-openjdk-amd64
+          ANDROID_NDK_HOME: ${{ steps.setup-ndk.outputs.ndk-path }}
+          ANDROID_NDK_ROOT: ${{ steps.setup-ndk.outputs.ndk-path }}
+        working-directory: ./apps/calculator
+        run: |
+          rustup target add aarch64-linux-android
+          flutter pub get
+          flutter build apk --debug --target-platform android-arm64 --split-per-abi
+
+      - uses: actions/upload-artifact@v4
+        with:
+          path: "apps/calculator/build/app/outputs/apk/debug/*.apk"
+          compression-level: 2

apps/calculator/lib/main.dart

@@ -58,6 +58,7 @@ class _MyAppState extends State<MyApp> {
               // TODO:
               // - keyboard type
               // - clear history
+              // - app info
             },
           ),
         ],