Android

What is Android?

Application Framework
Dalvik virtual machine
Browser based on WebKit
Optimized graphics (OpenGL ES 1.0)
SQLite
Features

Android Architecture

SDK
IDE
Debugger
Profiler
Resource Building
Deployment
Tools

Views
Content Providers
Resource Manager
Notification Manager
Activity Manager
Application Framework

Layouts
XML Files
Can be nested
Strings
Colors
Arrays
GUI

IDs
Using the @+id/name syntax
Resource Building - R.java
XML
GUI

Views
TextView, Button, EditText, RadioButton, etc.
Layouts
LinearLayout
RelativeLayout
TableLayout
Layouts

Most Common
<android:layout_height>
<android:layout_height>
Wrap_content, fill_parent …
Layout Parameters

A single thing the user can do
It can be reused
Can be invoked by other applications
It Can be
Full Screen Window
Floating Windows
Embedded
Activities

Activity Lifecycle

package com.HelloWorld;
import android.app.Activity;
import android.os.Bundle;
public class About extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.about);
}
}
A typical Activity

Each applications has it own process
Sandbox
User IDs and File Access
Permissions
Security and Permissions

Intent – What you want done
IntentFilters – What an activity do or IntentReceiver do
Registered in Android Manifest
Intent & IntentFilters

Enables sata sharing between the applications
Querying , Modifying, Adding, Deleting
Hide underlying inplementation
Represented by URIs
content://media/internal/images
content://contacts/people
Content Providers

Runs in background
MP3 player, weather service, download
Run in application’s process or another process
Services

Universal Search
Automated Backups
Polished Applications
Better Performance
Whats Next?

http://developer.android.com
http://www.anddev.org/
XDA Developers forum for android development
Where to start?

http://slgtug.blogspot.com	39
http://www.slgtug.blogspot.com	39
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Android

by keshan88 on Aug 14, 2009

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