Android, from Coursera course beginning 25 Sept 2017
From MyWiki
Simple first program
1. choose empty activity
2. we will edit activity_main.xml and MainActivity.java
3. use api level 16
4. Get rid of "hello world"
5. Drag button
6 width = match parent, change background colour
7 changethe id of the button and also the text
8 onclick property, speccify the name of method