Transcript Development on Android

App Development on Android
Contents
Introduction of Mobile App and Android
Key Concepts in Android
Designing the User Interface
Graphic
Multimedia
Storing Local Data
Introduction of Mobile App
Mobile App and Computer Application
Introduction of Mobile App
User Interface (UI)
Introduction of Mobile App
User Friendly (UE)
Introduction of Android
Android and JAVA
Introduction of Android
Android Software Development Kit
Introduction of Android
Android Virtual Device
Android
Each layer uses
the services
provided by the
layers below it.
Linux Kernel
I. Memory management
II. Networking
III. Other operating system service
 Transparent to users
 Android programs can not make
Linux calls directly.
Native Libraries
Surface Manager:
 It is a compositing widow manager similar to Vista or Compiz.
I.
Drawing commands go into off-screen bitmaps,
II. Combine bitmaps to form the display the user sees.
Native Libraries
2D
and 3D
Graphics
2- and 3-Dimensional elements can be combined in a
single user interface with Android.
The library will use 3D hardware if the device has it or a
fast software renderer if it doesn’t.
Native Libraries
Media Codecs
Android can play video, record and play back audio in a
variety of formats.
AAC, AVC (H.264), H.263, MP3 and MPEG-4.
Native Libraries
SQL database
A lightweight data engine.
Use SQLite for persistent storage in
applications.
Application Framework
 Application Framework layer provides the high-level
building blocks used to create applications.
 It comes preinstalled with Android, but can be extended
with own components as needed.
We will discuss the most important parts of the
framework.
Application Framework
Activity Manager
Control the life cycle of applications,
Maintain a common “backstack” for user navigation.
Application Framework
Content Providers
Encapsulate data that needs to be shared between
applications.
Resource Manager
Resources are anything that goes with programs that is not
code.
Application Framework
Location Manager
Track and record the location information of phone.
Notification Manager
Present events such as arriving messages, appointments,
proximity alerts and alien invasions.
Building Blocks
Activities
An activity is a user interface screen. Applications can
define one or more activities to handle different phases of
the program.
Building Blocks
Intents
An intent is a mechanism for describing a specific action,
such as “pick a photo,” “phone home,” or “open the pod bay
doors.” In Android, just about everything goes through
intents.
Building Blocks
Services
A service is a task that runs in the
background without the user’s direct
interaction.
For example, the music may be
started by an activity, but you want it
to keep playing even when the user
has moved on to a different program.
Building Blocks
Content Providers
A content provider is a set of data wrapped up in a custom
API to read and write it. This is the best way to share global
data between applications.
For example, For example, Google provides a content
provider for contacts. All the information in contacts can be
shared by any application that wants to use it.
Resources
Resources are the additional files and static content that
your code uses, such as bitmaps, layout definitions, user
interface strings, animation instructions, and more.
Resources
Animation
Color
Drawable
Layout
Menu
Values
Asset
Layout
Linear Layout
The Linear Layout
arranges its
children in a
single column or
a single row.
Horizontal
Vertical
Layout
Relative Layout
The Relative Layout is a
Layout where the positions
of the children can be
described in relation to each
other or to the parent.
Layout
Relative Layout
The Relative Layout is a
Layout where the positions
of the children can be
described in relation to each
other or to the parent.
Graphics
Color
Alpha, Red, Green, Blue (ARGB).
Each of them have 256 possible values.
Alpha is a measure of transparency. 0 means completely
transparent, whatever RGB are. 255 means completely
opaque.
For example, (127, 255, 0, 255).
Animation
 Shake
 Res/anim/shake.xml
10 pixels
1 second
 Res/anim/cycle_7.xml
Repeat 7 times
Multimedia
 We can play almost all
kinds of multimedia
resources in our Android
app.
Storing Local Data
File system in Android
 Context class
I.
II.
III.
IV.
deleteFile()
fileList(
openFileInput()
openFileOutput()
http://www.pace.edu/seidenberg/mobile-appdevelopment-bowl-2015-challenge/technicalresources-support