Welcome to Android Workshop

Prerequisite 

Head over to this link to download the boilerplate

https://github.com/sunwaytechclub/AndroidWorkshop-Boilerplate

What will we achieve today?

In an Android Activity 

MainActivity.java

activity_main.xml

When you click on the + button

MainActivity.java

InputToDo.java

Alert Dialog

Android Activity Lifecycle

linear layout

To Navigate to other activity

• We can start an activity by sending an Intent to Android

Intent intent= new Intent (MainActivity.this , InputToDo.class)
startActivity(intent)

Why do we need ListView?

• To Display a List of scrollable items

How do ListView work?

Many would assume that the data is directly binded to the listview

The right way

• The data do not know where to go!!
• The adapter will bind the data source to the listview
• The adapter converts an array item into a String object and putting it into a TextView. The TextView is then displayed in the ListView.

Table Visualization 

To save data offline in Android

• Shared Preferences

• Internal Storage

• External Storage

• SQLite Database

• Network Connection

SQLite Database

• Lightweight
• Optimized for a single user
• Stable and fast

Each database contains of two files

1.  Database file - all data is stored in this file
2.  Journal file - Contains all the changes made to your database

To use a SQLite Database, we need a

• SQLiteHelper
  • Helps to create and manage database
• SQLiteDatabase
  • Gives access to the database
• Cursors
  • Lets you read from and write to the database