https://stackoverflow.com/questions/8648616/webview-javascript-cross-domain-from-a-local-html-file

參考資料：

為了讓 alert 可以生效 https://issuetracker.google.com/issues/36905249

Name		Name	Last commit message	Last commit date
Latest commit History 5 Commits
app		app
gradle/wrapper		gradle/wrapper
.gitignore		.gitignore
README.md		README.md
build.gradle		build.gradle
gradle.properties		gradle.properties
gradlew		gradlew
gradlew.bat		gradlew.bat
settings.gradle		settings.gradle