For the Android Programming Seminar conducted at MinSCAT Main Campus, Multimedia Room, February 18th 2019 I presented this when I'm in an student internship exchange program

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Android Programming
I n t r o d u c t i o n , S Q L i t e ,
a n d R e c y c l e r V i e w

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Why Android?

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Why Android?
Source: www.statista.com/statistics/266136/global-market-share-held-by-smartphone-operating-
systems/

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What languages are used?

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What languages are used?

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What languages are used?

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THE BASICS
A n d r o i d S t u d i o
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ANDROID STUDIO
h t t p s : / / d e v e l o p e r . a n d r o i d . c o m / s t u d i o /
Recommended System Requirements:
• Microsoft® Windows® 7/8/10 (32 or 64-bit)
• 3 GB RAM minimum, 8 GB RAM recommended; plus 1
GB for the Android Emulator
• 2 GB of available disk space minimum,
4 GB Recommended (500 MB for IDE + 1.5 GB for
Android SDK and emulator system image)
• 1280 x 800 minimum screen resolution
Storage Needed:
• IDE: 1.5 GB (948 MB download for installation file)
• Standard Development Kits (SDKs): +-150 MB each
• SDK 21-28 (Lollipop-Pie): 1 GB
• Emulator (optional): 561 MB
• Total: ~3 GB
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For reference…
My laptop
• Intel Core i5 7200U dual-core 2.50 GHz
• DDR4 8 GB RAM
• 250 GB SSD
Software
• Android Studio
• Vysor

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PROJECT STRUCTURE
• java
• Contains codes of java classes for the algorithms
• You may create your own packages inside
• res
• Contains xml files to represent activity layouts,
drawable, and variables
F o l d e r h i e r a r c h y
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XML
XML stands for eXtensible Markup Language
XML is a markup language much like HTML
XML was designed to store and transport data
XML was designed to be self-descriptive

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SQLITE
I n t e r n a l D a t a b a s e
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SQLite vs MySQL
S Q L i t e
• Open-source
• Supported data type:
• BLOB, NULL, INTEGER, TEXT
• Server-less
• File-based, makes it very portable
M y S Q L
• Was open-source, before acquired by Oracle. Open-source
version is MariaDB
• Supported data type:
• NUMERIC, DATE, DATETIME, TIMESTAMP, BLOB, TEXT,
TINYBLOB, MEDIUMBLOB, CHAR, VARCHAR, TINYINT,
SMALLINT, INT, FLOAT, DOUBLE, LONGBLOB, REAL, ENUM, etc.
• More powerful and higher performance
• Security features built-in
• User management capabilities
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SQLite in Android
Built-in
• The android.database and android.database.sqlite packages offer a higher-performance alternative
where source compatibility is not an issue.
• Single-file database.
Lightweight -> High performance
Secure
• Android-databases created in Android are visible only to the application that created them
Self-contained, serverless, zero-configuration, transactional
Easy to use
W h y ? W h a t f o r ?

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When to use SQLite
Your app is fully offline
Storing local app preferences, e.g.
• recently used emoji as in WhatsApp, and
• app theme/appearance
Storing data that your users might prefer to not be stored online
Storing cache data for certain situations e.g. when your app can’t connect to the internet

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When NOT to use SQLite
The data you’re storing is larger and more complicated
The data you’re storing is something your users might prefer to be synced
across devices

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DATA DEFINITION
https://developer.android.com/reference/android/database/s
qlite/SQLiteOpenHelper
• Create a subclass of SQLiteOpenHelper and override
onCreate and onUpgrade
• The constructor must execute its superclass’ constructor
• You can change the DDL query in TABLE_CREATE
U s i n g S Q L i t e O p e n H e l p e r c l a s s
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DATA MANIPULATION
• Constructor (instantiates the OpenHelper
object)
• open
• close
• getAll
• get
• insert
• update
• delete
• An inner class to hold the return value
C l a s s m e t h o d s
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DbStudents.Student inner class

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getAll()

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insert(String name, String phone)

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reslayoutactivity_main.xml

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MainActivity.java

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V i e w i n g D a t a
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RECYCLERVIEW

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A ListView with higher memory efficiency

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Has three layouts

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The data collection changes on runtime based on user interaction
or network events

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What you need to build a RecyclerView
A <RecyclerView/> in the layout xml
An xml file that defines the layout of a RecyclerView row
A LayoutManager object
• LinearLayoutManager
• GridLayoutManager
• StaggeredGridLayoutManager
An Adapter, which is a subclass of RecyclerView.Adapter
A List/ArrayList of data (objects) to show in the RecyclerView

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build.gradle (Module: app)

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reslayoutitem_student.xml

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reslayoutactivity_main.xml

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StudentAdapter.java

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StudentAdapter.Holder inner class

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MainActivity.java

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MainActivity.showRecyclerView()

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Project source codes are available here
•github.com/HibikiKagenui/Seminar_SQLite
SQLite
•github.com/HibikiKagenui/Seminar_RecyclerView
RecyclerView

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What you should learn next
UI
• Buttons (OnClickListener, etc.)
• EditText
Activity
• Activity Lifecycle
• Moving to another Acitivity
• Passing values from one activity to another
View Styles
• styles.xml
• Using the official Material Design library (https://material.io/develop/android/docs/getting-started/)
Consuming Web Service / Web API
• Retrofit

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Where you can learn more
YouTube
Udemy
Udacity
Tutorialspoint.com
Official Android documentation (https://developer.android.com/docs/)
Stackoverflow.com

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THANK YOU
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