Just a note to say that I collect here some handy links that have otherwise been seen to disappear or be hard to find over time. I use the tag feature a lot as a way to cross reference some entries.
android tips Activity, AppCompatActivity, FragmentActivity, and ActionBarActivity: When to Use Which?
google play requirements
Some actions are often forgotten. To close Apps that are no longer needed remember to Double-Tap on the home button.
