Android™ Application Development - Bahar Ali Khan

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Chapter 9: Peer-to-Peer Communication 284 } } // TODO: Do something } while (c.moveToNext()); Monitoring the Roster for Changes To monitor the roster for changes and presence updates, implement an IRosterListener and register it with an IM Session using addRemoteRosterListener, as shown in the skeleton code below: IRosterListener listener = new IRosterListener.Stub() { public void presenceChanged(String contact) throws RemoteException { // TODO Update the presence icon for the user. } public void rosterChanged() throws RemoteException { // TODO Update the roster UI. } public void selfPresenceChanged() throws RemoteException { // TODO Update the user’s presence. } }; try { imSession.addRemoteRosterListener(listener); } catch (RemoteException e) { } The Roster Listener includes event handlers that will be triggered when a contact has been added or removed from the current user’s roster, when a contact’s presence has changed, and if the user’s presence has changed. Adding Contacts to a Roster To add a new contact to the user’s roster, use addContact, specifying the contact username and a personal nickname to customize their entry on the roster, as shown below: imSession.addContact(“jim@dundermifflin.com”, “Big Tuna”, null); The specifi ed nickname is private and will only be visible to the device user. People are only added to the roster after they’ve approved the request to become an instant messaging contact. After you attempt to add a contact, the target user receives an invitation (represented as a subscription request) that he or she can either approve or decline. If the target user accepts the invitation, your user is placed in the target user’s roster (and vice versa), and he or she will be able to exchange instant messages and receive presence updates. Subscription requests are asynchronous, so you’ll need to listen for changes in the roster to determine when a subscription request has been granted.
Handling Subscription Requests Chapter 9: Peer-to-Peer Communication Requests from others to add the device user to their contact lists should be presented to the user for his or her explicit approval or rejection. Once the user has indicated his or her preference, you can approve or decline subscription requests using the approveSubscriptionRequest and declineSubscriptionRequest methods on an IM Session. As shown below, both methods take a contact name as a parameter; the approve method also accepts an optional nickname for the new contact being added. imSession.approveSubscriptionRequest(sender, “nickname”, null); imSession.declineSubscriptionRequest(sender); Removing and Blocking Contacts In these times of fl eeting attention and fi ckle friendships, there may come a time when a contact once added to a roster is no longer considered worthy of the honor. In extreme cases, users may choose to block all messages from a particular user. Call removeContact from an IM Session to remove a contact from the user’s roster and unsubscribe from his or her presence updates. imSession.removeContact(“whathaveyoudoneforme@lately.com”); When ignoring someone isn’t enough, users can choose to block their messages entirely. The blockContact method effectively reverses the initial subscription-request approval and automatically denies any new subscription requests: imSession.blockContact(“ex@girlfriend.com”); Blocked contacts are added to the users “blocked list,” which, like the roster itself, resides on the server. A contact blocked from Android will also be blocked in all other Google Talk clients. Managing the User’s Presence The presence of the logged-in IM Session user is available using the getPresence method, as shown in the snippet below: Presence p = imSession.getPresence(); This Presence object can be used to determine the user’s IM visibility, his status, and any custom status message. To change the user’s presence, modify the Presence object and transmit it to the instant messaging server by calling setPresence on the IM Session. The following code snippet shows how to set the user presence to DO_NOT_DISTURB and specifi es a custom status message: String customMessage = “Developing applications for Android. Professionally”; p.setStatus(Presence.Show.DND, customMessage); imSession.setPresence(p); 285
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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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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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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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} } break; Chapter 6: Data Storage,
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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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