Android development getting started

https://www.vogella.com/tutorials/Android/article.html
https://medium.com/android-news/how-to-get-started-in-android-development-properly-830aeb5a8378
https://medium.com/mindorks/learning-android-development-in-2019-a-practical-guide-ddc71e008696
https://techbeacon.com/app-dev-testing/ultimate-android-development-guide-50-beginner-expert-resources

https://www.quora.com/How-do-I-get-started-with-Android-application-development-with-only-very-basic-knowledge-about-programming

https://docs.unity3d.com/530/Documentation/Manual/android-GettingStarted.html

http://library.vuforia.com/articles/Solution/Getting-Started-with-Vuforia-for-Android-Development.html
https://guides.codepath.com/android/Beginning-Android-Resources

https://docs.juce.com/master/tutorial_android_studio.html