How the activity cycle of android is.

1. THE ANDROID ACTIVITY
LIFECYCLE

3. Active and Visible Lifetimes
The onPause
The onResume

5. ACTIVITY TERMINATION
Starting from HoneyComb onwards, you can prepare for app termination in the
onStop.
If you are targeting pre-honeycomb, prepare for it as early as onPause

6. How to prepare for Termination
Close any connections or sockets

8. Maintaining State
onSaveInstanceState called immediately before onPause
onRestoreInstanceState is called immediately after onCreate but only if
the app is being restarted after being terminated by the system
You can use these to restore your app the same state the user saw before their
exited the app

9. Storing Data in Android
Saves battery not to keep fetching data
Two Types:
1. SharedPreferences - using persistent key-value pairs for primitive data
types
2. Databases - Helps organise and find data easily

16. Contract

20. WEATHER AND LOCATION TABLES

22. SQLite OPneHelper

24. onUpgrade
Called when the database version has changed
Make sure to always change the version when you DB changes
If you modify the columns and add new ones, you might want to use the ALTER
TABLE command to add missing columns to the new DB

25. Read/Writting to the DB
Writing.
1. Get a reference to the Writable database
2. Create a ContentValues object of what you want to insert
3. Insert the content values and get back the row ID
Reading
1. All DB queries return cursor by default. A cursor is control structure that enables us to traverse
over the rows and columns of our result set