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Android Programming Beomjoo Seo (seobj@comp.nus.edu.sg) Sep., 12 CS5248 Fall 2012

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Contents Installation Example by a sample app, Hello, CS5284 Create an Android Project Building and Running Debugging General Topics Fundamental Components Activity, Service, Content Providers, and Broadcast Receiver Activity, Intent UI : Layout, Menu Thread Misc: Media Recorder, HTTP Post, MP4Parser Sample Application http://developer.android.com/guide/index.html

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Installation Procedure Install JDK 5 or JDK 6 Install Eclipse IDE Eclipse 3.5 or above Eclipse JDT plugin Run Android SDK starter package Install ADT plugin (ADT 20.0.3) Eclipse > Help > Install New Software -> Add https://dl-ssl.google.com/android/eclipse/ Configure ADT plugin http://developer.android.com/index.html Eclipse IDE for Java (EE) Developers

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Install SDK Packages From Android SDK and AVD Manager Via consoleORvia eclipse

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SDK Version Mapping Convention Android 4.0.3 Platform SDK Tools, Revision 20 API Level: 15

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Eclipse ADT Plugin Configuration Specify Android SDK locationIncrease ADT connection time out At Windows > Preferences > Android

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Creating a Sample App, Hello, CS5248

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Eclipse > New > Android Project

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Main Activity Class

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Graphical Layout Editor Update ADT plugin !!!

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XML Layout File

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Value Resources - Strings.xml

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R.java

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The Manifest file

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Default.properties

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Building App

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Building Process Running

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No Android Device ? Install USB Driver !!!

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1.Install OEM USB Driver from ASUS website. http://support.asus.com/download/http://support.asus.com/download/ and search by Transformer 2.Update Driver Software from Device Manager 3.Locate USB Driver folder 4.Enable USB Debugging at Transformer USB Driver Installation Update Driver software

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Enabling USB debugging OR

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After Successful USB Driver Installation /tools/ddms.bat OR

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Running Sample App.

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Sample Hello World Code

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Editing Sample Code BE PATIENT Since Eclipse may not be responsive for a long time !!! Add id to main.xml Edit HelloWorldActivity.java @+id/helloId

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Lets Debug the code

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A Sample Code

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App Failure

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Always, Look at DDMS !!!

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Correction

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Debugging via Dalvik Debug Monitor (ddms) Log.e("Hello, World", "Hello, BJ");

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Now, everything is ready

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Application Components Android application .apk : android package Four Application Components Activity A single screen with a user interface Service A background processing unit with no user interface Content Provider Broadcast Receiver Communication among components except Content Provider Intent

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Activity 1 Activity Lifecycle Implement Lifecycle Callbacks

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Activity 2 Hierarchical View Architecture ViewGroup (Layout) View ViewGroup (Layout) View View ViewGroup Declare Activity in the manifest

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Activity 3 Start an Activity Start an Activity for a Result Caller Activity Callee Activity finish Activities and Stack

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UI Declaring Layout Initiated when called setContentView() on onCreate() Use Visual Layout Editor for initial layout design. Edit XML file extensively. wrap_content or fill_parent

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UI Creating Menu Menu Types Options Menu Appears when a user touches MENU button. Context Menu Submenu How to Specify menu items in a XML resource menu Inflate a Menu Resource Respond to user Action At res/menu/game_menu.xmlinflate callback

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UI Handling UI Events onClick, onLongClick, onKey, onTouch,

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Thread UI Thread Main thread per application responsible for interacting with UI components. 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

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Use AsyncTask, Instead

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Misc - Media Recorder Modify CameraPreview to see the video during recording.

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Misc - HTTP Post Use HttpClient and HttpPost. Use multi-part/form-data to encapsulate segment. Do not allocate memory excessively.

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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.

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Misc - Connecting to NUS Wifi

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Misc Permission Issue Add following permissions to the manifest file.

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Sample Implementation MainActivity RecordActivity Upload Service PlayerActivity Option menuContext menu Record Record Button Click Preview Item ClickUpload Item Click

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Final Comment: Use ApiDemo !!!