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Programming on Android
By Rohit GhatolFrom
Pune Google Technology User Grouphttp://pune-gtug.blogspot.com
http://blog.punegtug.org
What is Pune-GTUG?
GTUG stands for Google Technology User Group
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Programming on Android
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Topics
• What is Android?• Android Architecture• Building blocks• Programming Basics• Sample Application• Questions and Answers
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What is Android?
Android is a software stack for mobile devices that includes an operating system, middleware and key applications. The Android SDK provides the tools and APIs necessary to begin developing applications on the Android platform using the Java programming language.
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What is Android?
Features• Application framework enabling reuse and replacement of components• Dalvik virtual machine optimized for mobile devices• Integrated browser based on the open source WenKit engine• Optimized graphics powered by a custom 2D graphics library; 3D graphics based on
the OpenGL ES 1.0 specification (hardware acceleration optional)• SQLite for structured data storage• Media support for common audio, video, and still image formats (MPEG4, H.264,
MP3, AAC, AMR, JPG, PNG, GIF)• GSM Telephony (hardware dependent)• Bluetooth, EDGE, 3G, and WiFi (hardware dependent)• Camera, GPS, compass, and accelerometer (hardware dependent)• Rich development environment including a device emulator, tools for debugging,
memory and performance profiling, and a plugin for the Eclipse IDE
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Topics
• What is Android?• Android Architecture• Building blocks• Programming Basics• Sample Application• Questions and Answers
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Android Architecture
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Topics
• What is Android?• Android Architecture• Building blocks• Programming Basics• Sample Application• Questions and Answers
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Building Blocks
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Activity
Media Player Screen
Service
Background Service
Content ProviderBroadcast Receivers
MP3 DownloadedMusic Directory
Intent
Building Blocks – The Glue
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What do I want to do?
Intent helps in • Launching Activities and Services• Application taking action on an event• Reusing building blocks (not code)
What if I want to send my mp3 file to my friend?• Do I write the email logic in my app?• How do I reuse existing email app?
• Explicit Intents• Implicit Intents
Topics
• What is Android?• Android Architecture• Building blocks• Programming Basics• Sample Application• Questions and Answers
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Programming Basics
• Android SDK provides followingo An Emulatoro Command line tools to control emulatoro Eclipse Plugin (downloaded separately)o Direct Testing of application on Mobile Devices
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Programming basics
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Programming basics
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Programming basics
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Main Screen(Activity)
Main Config File
Layout File
Generated from res directory
Programming basics
HelloWorld.javapackage com.punegtug.helloworld;import android.app.Activity;import android.os.Bundle;public class HelloWorld extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); }}
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Programming basics
main.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello"/></LinearLayout>
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Programming basics
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Programming basics
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Topics
• What is Android?• Android Architecture• Building blocks• Programming Basics• Sample Applications• Questions and Answers
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Digg
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Digg in Action
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Digg in Action
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Del.icio.us
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Del.icio.us in action
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Del.icio.us in action
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Del.icio.us in action
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Del.icio.us in action
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GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
GodSpeed Application In Action
Questions?
?
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