android - pune gtug

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


Programming on Android


Topics

• What is Android?• Android Architecture• Building blocks• Programming Basics• Sample Application• Questions and Answers


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.


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


Topics



Android Architecture


Topics



Building Blocks


Activity

Media Player Screen

Service

Background Service

Content ProviderBroadcast Receivers

MP3 DownloadedMusic Directory

Intent

Building Blocks – The Glue


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



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


Programming basics


Programming basics


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); }}


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>


Programming basics


Topics

• What is Android?• Android Architecture• Building blocks• Programming Basics• Sample Applications• Questions and Answers


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Questions?

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