Android™ Application Development - Bahar Ali Khan

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Chapter 9: Peer-to-Peer Communication Introducing Android Instant Messaging 280 Largely as a result of security concerns, developer access to the GTalk IM Service has been restricted for Android SDK version 1.0. As a result, the functionality described in this section will not be available to developers using the fi rst full release of the Android SDK. Rather than remove the affected sections, they have been left here in full as a guide for use with future Android releases. Later releases of Android will expose a full suite of instant messaging functionality through an XMPP based IM Service. This will include management of contact rosters, presence notifi cation, and the transmission and receipt of instant messages. Google Talk (GTalk) is an instant messaging protocol for peer-to-peer (P2P) communication. Once connected, GTalk maintains a persistent socket connection with the GTalk server, meaning fast response times and low latency. This section is based on an early SDK implementation that used GTalk. GTalk is based on the XMPP protocol, but it’s a Google-specifi c variant that currently requires that users have a Gmail account. What makes the GTalk Service particularly interesting for developers is the ability to broadcast Intents over the air (OTA) between Android devices using data messaging. Data messages received by a remote device are re-broadcast as Intents locally, meaning that this mechanism lets you broadcast an Intent on a remote device. The GTalk Service can be used to create your own multi-user, social, or collaborative applications. It provides the framework for building a range of applications, including distributed emergency warning systems, dynamic route guidance applications, family social networks, and augmented reality gaming systems. Android will eventually include all the interfaces needed to create a Google Talk Instant Messaging client, including full control over presence management and subscription handling. You can, if you’re so inclined, build a replacement for the native client — or simply use the relevant components within your own applications. Using the GTalk Service Before you can access the GTalk Service, you need to import the gtalkservice library into your application with a uses-library tag inside the application node of the project manifest, as shown below: You also need to add the GTalk uses-permission tag, as shown in this XML snippet:
Chapter 9: Peer-to-Peer Communication Android Instant Messaging functionality is exposed through various interfaces as described below: ❑ IGTalkService Is used to create, access, and manage GTalk connections. ❑ IGTalkConnection A GTalk Connection represents a persistent socket connection between the device and the server it’s connecting to. The GTalk Service creates a default connection upon start-up that you can access by calling getDefaultConnection on the GTalk Service object. ❑ IImSession Most instant messaging functionality is handled through the IImSession interface. It’s used to retrieve the IM roster, set the user presence, obtain the presence of contacts, and manage chat sessions. Each GTalk Connection creates a default session, available through the getDefaultSession method. ❑ IChatSession All instant messaging chats are handled through the IChatSession interface. New Chat Sessions are created by initiating new chats, or joining existing ones, from an IM Session object. Using the Chat Session interface, you can send new chat messages, invite new participants to a group chat, and return a list of people involved in a chat. ❑ IChatListener Implement IChatListener to listen for messages in an IM Session or Chat Session. The IChatListener interface handlers listen for incoming messages, new chat participants, and people leaving a chat. ❑ IGroupChatInvitationListener Implement IGroupChatInvitationListener to listen for invitations to join group chats. The onInvitationReceived handler is passed a GroupChatInvitation that includes the username of the inviter, the room address, a “reason” (usually the room description), and the password you need in order to join the group chat. ❑ IRosterListener You can monitor your IM contacts roster, and the presence of the people on it, by implementing the IRosterListener interface. The Roster Listener includes event handlers that are fi red when there are changes in a contact’s presence as well as upon the addition and removal of contacts from the roster. Binding to the GTalk Service To use the GTalk Service, it must be bound to your application component using bindService. The bindService method accepts two input parameters, an Intent, which specifi es a component to bind to, and a ServiceConnection implementation. The following skeleton code demonstrates the pattern used to bind to the GTalk service: IGTalkService gtalkService; private void bindGTalk() { Intent i = new Intent(); } i.setComponent(GTalkServiceConstants.GTALK_SERVICE_COMPONENT); bindService(i, gTalkConnection, 0); private ServiceConnection gTalkConnection = new ServiceConnection() { 281
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Professional Android Application su
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Professional Android Application D
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Professional Android Application D
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About the Author Originally from Pe
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Acknowledgments A big thank you goe
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Contents Chapter 2: Getting Started
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Contents xii Saving and Loading Fil
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Contents Chapter 10: Accessing Andr
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Introduction Now is an exciting tim
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Introduction covered, you can move
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Introduction At http://p2p.wrox.com
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Chapter 1: Hello, Android 2 Using t
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Chapter 1: Hello, Android An Open P
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Chapter 1: Hello, Android 6 ❑ ❑
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Chapter 1: Hello, Android 8 When ma
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Chapter 1: Hello, Android 10 In mar
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Chapter 1: Hello, Android 12 Each A
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Chapter 1: Hello, Android 14 ❑ Da
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Chapter 1: Hello, Android 16 ❑ an
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Getting Started All you need to sta
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Chapter 2: Getting Started Unless o
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Installing the ADT Plug-in Install
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Chapter 2: Getting Started 3. In th
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Chapter 2: Getting Started If every
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} lp = new LinearLayout.LayoutParam
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❑ ❑ ❑ ❑ ❑ Small screens w
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Chapter 2: Getting Started on how t
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Chapter 2: Getting Started To start
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Ensuring a Seamless User Experience
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Figure 2-11 Chapter 2: Getting Star
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} myListView.setAdapter(aa); Chapte
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Chapter 2: Getting Started A number
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Creating Applications and Activitie
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Chapter 3: Creating Applications an
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Creating Resources Chapter 3: Creat
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❑ ❑ #ARGB #ARRGGBB Chapter 3: C
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android:startOffset=”500” andro
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Referencing Resources in Resources
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} } Chapter 3: Creating Application
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Chapter 4: Creating User Interfaces
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Chapter 5: Intents, Broadcast Recei
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Data Storage, Retrieval, and Sharin
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Chapter 6: Data Storage, Retrieval,
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} } } Chapter 6: Data Storage, Retr
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Querying Your Database Chapter 6: D
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} // Open or create the database to
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Adding, Updating, and Deleting Cont
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Maps, Geocoding, and Location-Based
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Chapter 7: Maps, Geocoding, and Loc
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Chapter 11: Advanced Android Develo
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400 Android, getting started Androi
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402 databases databases creating ea
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404 interapplication communication
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406 passing custom class objects pa
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408 synchronizing threads synchroni
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Programmer to Programmer Get more
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Android™ Application Development - Bahar Ali Khan

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