set android sdk

.github/workflows/android.yml

@@ -14,6 +14,9 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
+    - name: Setup Android SDK
+      uses: android-actions/setup-android@v3
+      
     - name: set up JDK 11
       uses: actions/setup-java@v1
       with: