------------ PAGE 1 ------------ Android Presentation By Manish K Chauhan manish. ieee@ gmail. com Samsung India ------------ PAGE 2 ------------ Agenda • Mobile Application Development ( MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android Live Demo ------------ PAGE 3 ------------ Few reasons to go MAD… • Smart Phones – Internet access anywhere – Social networking • Millions of mobile users • Open standards ------------ PAGE 4 ------------ Introduction to Android • Open software platform for mobile development • A complete stack – OS, Middleware, Applications • An Open Handset Alliance ( OHA) project • Powered by Linux operating system • Fast application development in Java • Open source under the Apache 2 license ------------ PAGE 5 ------------ license ------------ PAGE 6 ------------ Linux Kernel • Works as a HAL • Device drivers • Memory management • Process management • Networking ------------ PAGE 7 ------------ Libraries • C/ C libraries • Interface through Java • Surface manager – Handling UI Windows • 2D and 3D graphics • Media codecs, SQLite, Browser engine ------------ PAGE 8 ------------ Android Runtime • Dalvik VM – Dex files – Compact and efficient than class files – Limited memory and battery power • Core Libraries – Java 5 Std edition – Collections, I/ O etc… ------------ PAGE 9 ------------ Application Framework • API interface • Activity manager – manages application life cycle. ------------ PAGE 10 ------------ Applications • Built in and user apps • Can replace built in apps ------------ PAGE 11 ------------ Agenda • Mobile Application Development ( MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android ------------ PAGE 12 ------------ Application Building Blocks • Activity • IntentReceiver • Service • ContentProvider ------------ PAGE 13 ------------ Activities • Represents the presentation layer of an Android application, e. g. a screen which the user sees. An Android application can have several activities and it can be switched between them during runtime of the application. But, they can: – Be faceless – Be in a floating window – Return a value ------------ PAGE 14 ------------ IntentReceivers • Components that respond to broadcast „ Intents. • Way to respond to external notification or alarms • Apps can invent and broadcast their own Intent ------------ PAGE 15 ------------ Intents • Think of Intents as a verb and object; a description of what you want done – E. g. VIEW, CALL, PLAY etc.. • System matches Intent with Activity that can best provide the service • Activities and Intent Receivers describe what Intents they can service ------------ PAGE 16 ------------ Intents GMail Contacts Home Blogger Chat Client component makes a request for a specific action “ Pick photo” Picasa System picks best component for that action New components can use existing functionality Blogger Photo Gallery ------------ PAGE 17 ------------ Services • Faceless components that run in the background – E. g. music player, network download etc… ------------ PAGE 18 ------------ ContentProviders • Enables sharing of data across applications – E. g. address book, photo gallery • Provides uniform APIs for: – querying – delete, update and insert. • Content is represented by URI and MIME type ------------ PAGE 19 ------------ Agenda • Mobile Application Development ( MAD) • Intro to Android platform • Platform architecture • Application building blocks • Development tools • Hello Android ------------ PAGE 20 ------------ Development Tools • Eclipse • Android SDK 1.0- 2.0 developer. android. com ------------ PAGE 21 ------------ The Emulator • QEMU- based ARM emulator • Runs the same image as the device • Limitations: – No Camera support http:// en. wikipedia. org/ wiki/ QEMU ------------ PAGE 22 ------------ Devices ------------ PAGE 23 ------------ Hello World • http:// developer. android. com/ guide/ tutorials/ hello- world. html • Generating UIs – Views – building blocks – E. g. TextView, EditText, Button – Placed into Layouts – E. g. LinearLayout, TableLayout, AbsoluteLayout ------------ PAGE 24 ------------ Application Lifecycle • Application run in their own processes ( VM, PID) • Processes are started and stopped as needed to run an application's components • Processes may be killed to reclaim resources ------------ PAGE 25 ------------ resources ------------ PAGE 26 ------------ Location Manager ------------ PAGE 27 ------------ XMPP Services • Allows any app to send device- to- device messages to other android users • Data Messages are Intents with name/ value pairs • Works with any gmail account… • Can also build servers to deliver server- to- device messages ------------ PAGE 28 ------------ Notification Manager ------------ PAGE 29 ------------ Notification Manager • How background app interact with users • Consistent notification presentation ------------ PAGE 30 ------------ Views ------------ PAGE 31 ------------ Views ------------ PAGE 32 ------------ Location Manager ------------ PAGE 33 ------------ References • http:// developer. android. com/