Try Github Actions for tests

.github/workflows/maven.yml

@@ -0,0 +1,52 @@
+name: Test Java 8, Android
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  ANDROID_HOME: $HOME/android-sdk-linux
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Android SDK
+      run: if [ ! -d $HOME/android-sdk-linux/platforms ]; then curl -s https://storage.googleapis.com/zxing-build/android-sdk-linux.tar.bz2 | bunzip2 | tar xf - -C $HOME; else ls -l $HOME/android-sdk-linux; fi
+    - name: Set up JDK 8
+      uses: actions/setup-java@v2
+      with:
+        java-version: '8'
+        distribution: 'temurin'
+        cache: maven
+    - name: Build with Maven
+      run: mvn -nsu -B -Pjacoco install
+
+# The Android SDK package android-sdk-linux.tar.bz2 above is built roughly like so:
+#
+# Download Command Line tools for Linux from https://developer.android.com/studio#downloads
+#
+# mkdir android-sdk-linux; cd android-sdk-linux
+# mv /path/to/sdk-tools-linux-4333796.zip .
+# unzip *.zip; rm *.zip
+#
+# # Or different, more recent versions; see sdkmanager --list
+# ./tools/bin/sdkmanager "platforms;android-22" "build-tools;28.0.2"
+# # Accept license
+#
+# ./tools/bin/sdkmanager --update
+# # Accept license
+#
+# cp tools/source.properties ..
+#
+# ./tools/bin/sdkmanager --uninstall tools
+#
+# mkdir tools; mv ../source.properties tools
+#
+# cd ..
+# tar cf - android-sdk-linux | bzip2 -9 > android-sdk-linux.tar.bz2