Add custom AAR support to llm-android workflow (#176)

Author: Copilot

.github/workflows/llm-android.yml

@@ -32,6 +32,10 @@ on:
         description: 'Custom URL for tokenizer file (only used when model_preset is custom)'
         required: false
         type: string
+      local_aar:
+        description: 'URL to download a local AAR file. When set, the workflow will download the AAR and use it instead of the Maven dependency.'
+        required: false
+        type: string
 
 permissions:
   contents: read
@@ -74,6 +78,12 @@ jobs:
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v4
 
+      - name: Download local AAR
+        if: ${{ inputs.local_aar }}
+        run: |
+          mkdir -p llm/android/LlamaDemo/app/libs
+          curl -fL -o llm/android/LlamaDemo/app/libs/executorch.aar "${{ inputs.local_aar }}"
+
       - name: AVD cache
         uses: actions/cache@v4
         id: avd-cache
@@ -145,6 +155,7 @@ jobs:
         uses: reactivecircus/android-emulator-runner@v2
         env:
           MODEL_PRESET: ${{ inputs.model_preset || 'stories' }}
+          USE_LOCAL_AAR: ${{ inputs.local_aar != '' }}
         with:
           api-level: ${{ env.API_LEVEL }}
           arch: ${{ env.ARCH }}
@@ -154,7 +165,7 @@ jobs:
           emulator-options: -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none -no-snapshot-save -memory 16384
           disable-animations: true
           working-directory: llm/android/LlamaDemo
-          script: bash ./scripts/run-ci-tests.sh "$MODEL_PRESET" "$MODEL_FILE" "$TOKENIZER_FILE"
+          script: bash ./scripts/run-ci-tests.sh "$MODEL_PRESET" "$MODEL_FILE" "$TOKENIZER_FILE" "$USE_LOCAL_AAR"
 
       - name: Add model response to summary
         if: always()

llm/android/LlamaDemo/scripts/run-ci-tests.sh

@@ -6,7 +6,7 @@
 # LICENSE file in the root directory of this source tree.
 
 # CI test script for running instrumentation tests with pre-downloaded models
-# Usage: ./run-ci-tests.sh <model_preset> <model_file> <tokenizer_file>
+# Usage: ./run-ci-tests.sh <model_preset> <model_file> <tokenizer_file> [use_local_aar]
 #
 # This script is designed for CI environments where models are pre-downloaded
 # to /tmp/llama_models/ before the emulator starts.
@@ -16,11 +16,13 @@ set -ex
 MODEL_PRESET="$1"
 MODEL_FILE="$2"
 TOKENIZER_FILE="$3"
+USE_LOCAL_AAR="${4:-false}"
 
 echo "=== Test Configuration ==="
 echo "MODEL_PRESET: $MODEL_PRESET"
 echo "MODEL_FILE: $MODEL_FILE"
 echo "TOKENIZER_FILE: $TOKENIZER_FILE"
+echo "USE_LOCAL_AAR: $USE_LOCAL_AAR"
 
 echo "=== Emulator Memory Info ==="
 adb shell cat /proc/meminfo | head -5
@@ -90,9 +92,11 @@ adb logcat > /tmp/logcat.txt &
 LOGCAT_PID=$!
 
 echo "=== Starting Gradle ==="
-./gradlew connectedCheck \
-  -PskipModelDownload=true \
-  -PmodelPreset="$MODEL_PRESET"
+GRADLE_ARGS="-PskipModelDownload=true -PmodelPreset=\"$MODEL_PRESET\""
+if [ "$USE_LOCAL_AAR" = "true" ]; then
+  GRADLE_ARGS="$GRADLE_ARGS -PuseLocalAar=true"
+fi
+eval ./gradlew connectedCheck "$GRADLE_ARGS"
 TEST_EXIT_CODE=$?
 
 echo "=== Model directory after Gradle ==="