Android is an open source operating system based on a Linux kernel and Java application framework. It includes features like a Dalvik virtual machine, SQLite database, OpenGL ES graphics, and more. The Android architecture consists of an application framework with activities, services, content providers, and intents that allow applications to work together. Developers use the Android SDK, IDE, and tools to build applications with user interfaces created from XML layouts and views.

1. What is Android?

2. Application FrameworkDalvik virtual machineBrowser based on WebKitOptimized graphics (OpenGL ES 1.0)SQLiteFeatures

3. Android Architecture

4. SDKIDE DebuggerProfilerResource BuildingDeploymentTools

5. ViewsContent ProvidersResource ManagerNotification ManagerActivity ManagerApplication Framework

6. Layouts XML FilesCan be nestedStringsColorsArraysGUI

7. IDsUsing the @+id/name syntaxResource Building - R.javaXMLGUI

8. ViewsTextView, Button, EditText, RadioButton, etc.LayoutsLinearLayoutRelativeLayoutTableLayoutLayouts

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

10. A single thing the user can doIt can be reusedCan be invoked by other applicationsIt Can beFull Screen WindowFloating WindowsEmbeddedActivities

11. Activity Lifecycle

12. 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

13. Each applications has it own processSandboxUser IDs and File AccessPermissionsSecurity and Permissions

14. Intent – What you want doneIntentFilters – What an activity do or IntentReceiver doRegistered in Android ManifestIntent & IntentFilters

15. Enables sata sharing between the applications Querying , Modifying, Adding, DeletingHide underlying inplementationRepresented by URIscontent://media/internal/imagescontent://contacts/peopleContent Providers

16. Runs in backgroundMP3 player, weather service, downloadRun in application’s process or another processServices

17. Universal SearchAutomated BackupsPolished ApplicationsBetter PerformanceWhats Next?

18. http://developer.android.comhttp://www.anddev.org/XDA Developers forum for android developmentWhere to start?