Download as PDF, PPTX
Uploaded bySiva Krishna Prasad
ANDROID PPT 1.pdf
This document provides an overview of setting up the development environment and creating a "Hello World" Android application. It discusses installing the Java Development Kit (JDK), Eclipse IDE, Android SDK, and Android Development Tools (ADT) plugin. It then demonstrates creating a new Android project called "Hello World", configuring it to run on an emulator, and analyzing the basic project structure and components. The key steps are to create an Android Virtual Device (AVD), set up a run configuration, and run the app. The project contains source code, resources, manifest file, and other files for a simple activity displaying "Hello World".
ANDROID PPT 1.pdf
- 1. General Course Outline •Introduction to Android and Mobile Devices • Setting up Development Environment • Application Architecture and Lifecycle • Java Language Basics and Syntax • Object Oriented Programming in Java • Vertical and Horizontal Libraries in Java • Object Oriented Principles and Practice • Building Android Applications • Android User Interface • Common Controls • Android Application Components: Activity, BroadcastListener, Service, Content Provider
- 2. System Requirements Setting upDevelopment Environment Supported OS 2.Windows XP (32-bit), Vista (32- or 64-bit), or Windows 7 (32- or 64-bit) 3.Mac OS X 10.5.8 or later (x86 only) 4.Linux (tested on Ubuntu Linux, Lucid Lynx) Supported Development Environment (Eclipse IDE based) 2.Eclipse 3.4 (Ganymede) or greater/Eclipse Classic (versions 3.5.1 and higher) 3.JDK 1.5 or 1.6 4.ADT Plugin
- 3. To set upthe development environment, we need: 2. Java Development Kit (JDK 1.5+, 1.6 is preferable) 3. Eclipse IDE 4. Android SDK Setting up Development Environment(Contd.)
- 4. Java Development Kit(JDK) Setting up Development Environment (Contd.) Download Link: http://www.java.com/en/download/index.jsp Download JDK from here and Install JDK
- 5. Eclipse IDE Setting upDevelopment Environment (Contd.) Download Link: http://eclipse.org/downloads/ Download the highlighted version of Eclipse IDE
- 6. Android SDK Setting upDevelopment Environment (Contd.) Link: http://developer.android.com/sdk/index.html Download and Install the SDK starter package from the table above (Highlighted)
- 7. Android SDK Setup(1) Setting up Development Environment (Contd.) 1. Install available packages to get all SDK platform versions
- 8. Android SDK Setup(2) Setting up Development Environment (Contd.) 2. Installation progress
- 9. Android SDK Setup(3) Setting up Development Environment (Contd.) 3. ADT Plugin for Eclipse ADT Plugin: Android Development Tools (ADT) is a plugin for the Eclipse IDE for •extending the capabilities of Eclipse to set up new Android projects •creating an application UI • adding components based on the Android Framework API • debugging your applications using the Android SDK tools • exporting signed (or unsigned) APKs in order to distribute your application We’ll see the 5 points gradually during development
- 10. Android SDK Setup(4) Setting up Development Environment (Contd.) 4. Installing the ADT • Start Eclipse, then select Help > Install New Software.... • Click Add, in the top-right corner. • In the next window, you'll see a list of the tools to be downloaded. Click Next. • Read and accept the license agreements, then click Finish. • When the installation completes, restart Eclipse.
- 11. Android SDK Setup(5) Setting up Development Environment (Contd.) 5. Set SDK path • Start Eclipse, then select Window > Preferences • Browse and show the path of Android SDK. • Press Apply and OK. Development Environment Setup is now completed!
- 12. Let’s say “Hello”to the Android World! In the subsequent slides: •We’ll create an application step by step using the help of IDE and ADT. •We’ll then explain application structure and identify the building blocks. •We’ll experiment with components and learn to convert our innovative ideas into neat apps. Now that our development environment is ready, we’ll build our first Android application.
- 13. Let’s say “Hello”to the Android World! (Contd.) 1. Start Eclipse and Go to File>New>Android Project 2. We keep project name “Hello World” (Since 1970 Ritchie’s book on C programming, programmers always say Hello World first) 3. Build Target “Android1.6” 4. Application name: “Hello World” 5. Package name: com.sentinelbd.hallo 6. Initial Activity Name: HalloActivity 7. Min SDK Version: 4 8. Click Finish Congratulations! You’ve just created your first Android application We’ll explain each input shortly
- 14. Let’s Go Deep… CreatedProject has the following structure Project Structure -Source (src) -Generated Class (gen) -Android 1.6 library -Assets (assets) -Resource(res) -drawable-hdpi -drawable-ldpi -drawable-mdpi -layout -values -AndroidMenifest.xml -default.properties
- 15. Let’s Go Deep…(Contd.) To run the app in emulator, we have to do the following steps: 3.Create AVD (Android Virtual Device) 4.Create Run Configuration 5.Run the Application To run the app in device, we have to do the following steps: 3.Install device driver 4.Connect device through USB 5.Create Run Configuration 6.Run the Application We’ll run the app in emulator for now
- 16. Let’s Go Deep…(Contd.) 1. Create AVD (Android Virtual Device) Use Android SDK & AVD Manager to create AVD
- 17. Let’s Go Deep…(Contd.) 2. Create Run Configuration • Create a Run Configuration • Browse and select the project to run
- 18. Let’s Go Deep…(Contd.) 3. Select AVD & Run Click Run to start AVD/emulator
- 19. Let’s Go Deep…(Contd.) Result in Emulator Now its time to analyze how it works
- 20. Project Structure… Created Projecthas the following structure Project Structure -Source (src) -Generated Class (gen) -Android 1.6 library -Assets (assets) -Resource(res) -drawable-hdpi -drawable-ldpi -drawable-mdpi -layout -values -AndroidMenifest.xml -default.properties
- 21. Project Structure (Contd.) -Source(src) We have used only one class here which is an Activity named HalloActivity. We’ll describe about Activity in detail with lifecycle shortly. For now we can consider Activity as Android analogue for the window or dialog in a desktop application. It can load view from xml layout (here main.xml under res/layout folder) In the HelloActivity class the view of the Activity is set from main.xml given below
- 22. Project Structure (Contd.) -res/layout/main.xml •UI Layout can be defined from source code using View or by layout xmls. • The layout xml can be generated by visual tool given by ADT
- 23. Project Structure (Contd.) -res/drawable •From Android 1.6 to support different screen sizes and screen densities graphic files are kept in 3 different folders drawable-hdpi, drawable-ldpi and drawable-mdpi • In our current project, they contain only default icon file with different dimensions to support devices with different screen resolution. -assets Holds other static files you wish packaged with the application for deployment onto the device. In this project, we have none -gen/R.java -values/strings.xml
- 24. Project Structure (Contd.) -AndroidMenifest.xml XMLfile describing the application being built and what components – activities, services, etc. – are being supplied by that application
- 25. Hmm.. No publicstatic void main() ??? What is the Entry Point of an Android App? Instead of main(), Android apps have the 4 essential components which can instantiate and run as needed: 1. Activities 2. Services 3. Broadcast Receivers 4. Content Providers Whenever there's a request that should be handled by a particular component, Android makes sure that •the application process of the component is running, •starting it if necessary, and •that an appropriate instance of the component is available, •creating the instance if necessary. But how a request is made? What is the missing link?