android
DESCRIPTION
for android developersTRANSCRIPT
twincling.org
August 8th, 2009Hyderabad, India
Mobile Application Development
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We appreciate
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Outline● Hello Android World● Android Architecture● Android SDK Overview● UI Development● 3D with OpenGL
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What is Android?An Open Platform for Mobile Development
● A hardware reference design for mobiles● A Linux operating system kernel● Open source libraries● A run time environment● An application framework and UI framework● Some pre-installed applications and● Software Development Kit
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Android SDK● No licensing, distribution, or development fees● Hardware access like network, Camera, accelerometer ● GSM, EDGE, and 3G networks● GPS with location-based services● Full multimedia hardware control including playback and recording using the
camera and microphone● Accelerometer and compass hardware● IPC message passing● Shared data stores● An integrated open source WebKit-based browser● Applications that integrate Map controls as part of their user interface● Peer-to-peer (P2P) support using Google Talk● Mobile-optimized hardware-accelerated graphics, both 2D and 3D● Optimized memory and process management
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Software Stack
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Android Application● Activity Manager● Views● Notification Manager● Content Providers● Resource Manager
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Android Libraries● android.util – string formatters, XML
● android.os – message passing, IPC, clock, debugging
● android.graphics – canvas, colors, primitives
● android.text – display, parse text
● android.database – cursors, database
● android.content – data access, content providers
● android.view – user interface
● android.widget – buttons, text boxes, list boxes etc
● com.google.android.maps – Google Maps
● android.app – Application, Activity and Services
● android.provider – standard content provider like Contacts
● android.telephony – phone stack
● android.webkit – Web-based content
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Android Advanced Libraries● android.location – Location access● android.media – Audio and Video● android.opengl – OpenGL ES API for 3D● android.hardware – Camera, Accelerometer, Compass● android.bluetooth - Bluetooth● android.net.wifi - WiFi
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SDK includes..● Android APIs● Android project development tools● Android executable(.dex) and packaging(.apk) tools● Android Emulator● Dalvik Debug Monitoring Service (DDMS)● Documentation and Sample Code
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SDK Setup● http://code.google.com/android/download.html● Android pluging available for Eclipse, Netbeans and
IntelliJ with JDK 5 or later● Android Development Toolkit (ADT) plugin
https://dl-ssl.google.com/android/eclipse/●
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Types of Android apps● Foreground Activity● Background Service● Intermittent Activity
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Component of an application● Activities● Services● Content Providers● Intents● Broadcast Receivers● Notifications
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Process States and Priority
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Activity Stack
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Activity States● Active● Paused● Stopped● Inactive
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State Changes
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In code.package org.twincling.hello;
import android.app.Activity;import android.os.Bundle;
public class HelloWorld extends Activity {/** Called when the activity is first created. */// Called at the start of the full lifetime.@Overridepublic void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);// Initialize activity.setContentView(R.layout.main);
}
// Called after onCreate has finished, use to restore UI state@Overridepublic void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);// Restore UI state from the savedInstanceState.// This bundle has also been passed to onCreate.
}
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//Called before subsequent visible lifetimes//for an activity process.@Overridepublic void onRestart(){
super.onRestart();//Load changes knowing that the activity has already//been visible within this process.
}//Called at the start of the visible lifetime.@Overridepublic void onStart(){
super.onStart();//Apply any required UI change now that the Activity is visible.
}//Called at the start of the active lifetime.@Overridepublic void onResume(){
super.onResume();//Resume any paused UI updates, threads, or processes required//by the activity but suspended when it was inactive.
}//Called to save UI state changes at the//end of the active lifecycle.@Override
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//Called to save UI state changes at the//end of the active lifecycle.@Overridepublic void onSaveInstanceState(Bundle savedInstanceState) {
//Save UI state changes to the savedInstanceState.// This bundle will be passed to onCreate if the process is// killed and restarted.super.onSaveInstanceState(savedInstanceState);
}// Called at the end of the active lifetime.@Overridepublic void onPause(){
// Suspend UI updates, threads, or CPU intensive processes// that don’t need to be updated when the Activity isn’t// the active foreground activity.super.onPause();
}
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// Called at the end of the visible lifetime.@Overridepublic void onStop(){
// Suspend remaining UI updates, threads, or processing// that aren’t required when the Activity isn’t visible.// Persist all edits or state changes// as after this call the process is likely to be killed.super.onStop();
}// Called at the end of the full lifetime.@Overridepublic void onDestroy(){
// Clean up any resources including ending threads,// closing database connections etc.super.onDestroy();
}}
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Summary / Take home● Android overview● Get started on mobile app development
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Books
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AppLabs Pvt. Ltd.
http://www.applabs.com/
Special thanks
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freedom of innovation5,000+ members
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