Introduction to Android Programmingcs5248/1516S1/l03/L3-Programming… · •Android apps are written in Java •The Android OS is a multi-user Linux system •Android app lives in

Introduction to Android

Programming(CS5248 Fall 2015)

Aditya Kulkarni (email.aditya.kulkarni@gmail.com)

August 26, 2015

*Based on slides from Paresh Mayami (Google Inc.)

Contents• Introduction

• Android OS

• Environment Setup

• Android OS

• Creating and Building Android App• Create an Android Project

• Building and Running

• Debugging

• Android OS

• Debugging

• General Topics• Android Application Components

• Misc: Media Recorder, MediaCodec, HTTP Post, MP4Parser

• Android OS

• Debugging

• General Topics• Android Application Components

• Misc: Media Recorder, MediaCodec, HTTP Post, MP4Parser

• Sample Applicationhttp://developer.android.com/guide/index.html

Application Fundamentals• Android apps are written in Java

• The Android OS is a multi-user Linux system

• Android app lives in its own security sandbox• System assigns each app a unique Linux user ID

• Each process has its own virtual machine

• Every application runs in its own Linux process

• Android app lives in its own security sandbox• System assigns each app a unique Linux user ID

• Each process has its own virtual machine

• Every application runs in its own Linux process

• The Android system implements the principle of least privilege

http://developer.android.com/guide/components/fundamentals.html

Environment Setup

•Four basic steps to get an App running• Step 1: Install JDK

Environment Setup

•Four basic steps to get an App running• Step 1: Install JDK• Step 2: Configure the SDK

Environment Setup

•Four basic steps to get an App running• Step 1: Install JDK• Step 2: Configure the SDK• Step 3: Create your first Android App

Environment Setup

•Four basic steps to get an App running• Step 1: Install JDK• Step 2: Configure the SDK• Step 3: Create your first Android App• Step 4: Build and Run your App

Step-1: Install JDK

JDK Installation• JDK and JRE are different!• Can download the JDK for your OS at

http://java.oracle.com• Alternatively, for OS X, Linux:

–OS X: • Open /Applications/Utilities/Terminal.app• Type javac at command line• Install Java when prompt appears

–Linux: • Type sudo apt–get install default–jdk at

command line (Debian, Ubuntu)• Other distributions: consult the documentation

Install!

Step-2: Configure the SDK

SDK Configuration

•Download Android SDK from http://developer.android.com

SDK Configuration

•Download Android SDK from http://developer.android.com

•Simplest: Download and install Android Studio bundle (including Android SDK) for your OS

Install!

Step-3: Create your first Android App

Your first Android App

Long time ago, in a galaxy far, far away …

• Eclipse IDE- Official IDE for Android development

• ADT plugin

• Apache Ant for building projects

… so Google said …

Install

• Recommended: Install Android 2.2, 2.3.3 APIs and 4.x API

• Do not worry about Intel x86 Atom, MIPS system images

Settings

Run Android SDK Manager

Now you are ready for Android development!

Create new Android project

Create Activity

The Manifest File

• Identify any user permissions the application requires

The Manifest File

•Declare the minimum API level required by the application

The Manifest File

•Declare hardware and software features used or required by the application

The Manifest File

•Declare hardware and software features used or required by the application

• API libraries the application needs to be linked

The Manifest File

Step-4: Building & Running your App

Building Process

Running

No Android Device?

Install USB Driver !!!

• Install OEM USB Driver from ASUS website.http://support.asus.com/download/ and search by Transformer

• Update Driver Software from Device Manager

• Locate USB Driver folder

• Enable USB Debugging at Transformer

USB Driver Installation

Update Driver software

Enabling USB Debugging

Running Sample App

Sample “Hello World” Code

Editing Sample Code

Add id to main.xml

“@+id/helloId”

Editing Sample Code

Add id to main.xml

Edit HelloWorldActivity.java

“@+id/helloId”

A Sample Code

Important points

1. UI Element has an Id

2. Variables in our code linkto UI elements

3. Update UI element content from the program

App Failure

Let us debug the code …

Always, look at DDMS !!!

Correction

Debugging via Dalvik Debug Monitor Service (DDMS)

Log.e("Hello, World", "Hello, BJ");

Android Application Components

Application Components

• Android Application• .apk : Android package

• Four Application Components• Activity

• Service

• Content Provider

• Broadcast Receiver

• Four Application Components• Activity

• Service

• Content Provider

• Broadcast Receiver

• Communication among components except Content Provider• Intent

Activity

• Activity Lifecycle • Implement Lifecycle Callbacks

Activity

• Hierarchical View Architecture• ViewGroup (Layout)

• View

• ViewGroup (Layout)• View

• View

• …

• View

• ViewGroup• …

Activity

• Hierarchical View Architecture• ViewGroup (Layout)

• View

• ViewGroup (Layout)• View

• View

• …

• View

• ViewGroup• …

• Do not forget to declare Activity in the Manifest

Activity• Start an Activity

• Start an Activity for a Result

• Caller Activity

• Callee Activity

• finish

Activities and Stack

Services

• A service is a component that runs in the background to perform long-running operations

Services

• A service does not provide a user interface

Services

• Another component, such as an activity, can start the service and let it run or bind to it in order to interact with it

Services

• Another component, such as an activity, can start the service and let it run or bind to it in order to interact with it

e.g a service might play music in the background while the user is in a different app

Broadcast Receivers

• A broadcast receiver is a component that responds to system-wide broadcast announcements

Broadcast Receivers

• Apps can also initiate broadcasts

Broadcast Receivers

• Apps can also initiate broadcasts

• Although broadcast receivers don't display a UI, they may create a status bar notification to alert the user when a broadcast event occurs

Content Providers

•A content provider manages a shared set of app data

Content Providers

•Through the content provider, other apps can query or even modify the data

Content Providers

•Through the content provider, other apps can query or even modify the data

•Any app with the proper permissions can query part of the content provider

Intent

An intent is an abstract description of an operation to be performed

Intent

• It can be used with startActivity to launch an Activity

Intent

• broadcastIntent to send it to any interested BroadcastReceiver components

Intent

• broadcastIntent to send it to any interested BroadcastReceiver components

• startService(Intent) or bindService(Intent, ServiceConnection, int) to communicate with a background Service

UI – Declaring Layout• Initiated when called setContentView() on

onCreate()

• Use Visual Layout Editor for initial layout design

onCreate()

• Use Visual Layout Editor for initial layout design

• Edit XML file extensively

UI – Handling UI Events

• onClick, onLongClick, onKey, onTouch, …

Thread• UI Thread

• “Main” thread per application is responsible for interacting with UI components

Thread• UI Thread

• “Application Not Responding” problem• If UI thread is blocked more than several seconds, ANR

dialog appears

• Do not block the UI thread

• Do not access UI components outside UI thread

Thread• UI Thread

• “Application Not Responding” problem• If UI thread is blocked more than several seconds, ANR

dialog appears

• Do not block the UI thread

• Do not access UI components outside UI thread

modify

Use AsyncTask, Instead

Misc - Media Recorder

• Modify CameraPreview to see the video during recording

Misc – Media Codec

• To access low-level media codecs, i.e. encoder/decoder components

Misc - HTTP Post

• Use HttpClient and HttpPost

• Use “multi-part/form-data” to encapsulate segment

• Do not excessively use memory

Misc – Permission Issue

• Add following permissions to the Manifest file

Sample Implementation

MainActivity

CaptureActivity

Upload Service

PlayerActivity

Option menu Context menu

Capture

Capture Button Click

Play click

Background Upload

Misc - Integration with MP4Parser• Adding a jar file

• Create its jar file

• Add jar file to the app• Build Path > Configure Build Path > Libraries > Add JARs

• If you include source files directly,

• Put Isoparser-default.properties to assets folder

• Change getResourceAsStream(“isoparser-default.properties”) in PropertyBoxParserImpl to “/assets/isoparser-default.properties”

https://code.google.com/p/mp4parser/

https://github.com/sannies/mp4parser

Final Comment: Use ApiDemo !!!

General References• How to work with Android GUI layouts

https://www.youtube.com/watch?v=xn9KYnwIoBE

• Building and running your app http://developer.android.com/tools/building/building-eclipse.html

• Deployment of the .apk file http://stackoverflow.com/questions/3480201/how-do-you-install-an-apk-file-in-the-android-emulator

• Find the hidden developer option http://www.cnet.com/how-to/restore-the-developer-options-menu-in-android-4-2/

• Rotation lock/unlock http://www.howtogeek.com/howto/26715/how-to-make-your-android-phone-stop-rotating-the-screen-when-you%E2%80%99re-reading-sideways/

• Video tutorials http://www.youtube.com/watch?v=5RHtKIo_KDI

• Load/Open an existing package (e.g., the provided ClassExamples) into your eclipse • File --> Import ... --> General-Tab --> Existing Projects into Workspace

(and click Next)• Select root Directory: click Browse: select the folder the include the

AndroidManifest.xml or project.properties files.• Click finish

Thank You!Any questions

Introduction to Android Programmingcs5248/1516S1/l03/L3-Programming… · •Android apps are written in Java •The Android OS is a multi-user Linux system •Android app lives in

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