Android™ Application Development - Bahar Ali Khan

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Chapter 10: Accessing Android Hardware 340 Bluetooth is a system service accessed using the getSystemService method. Get a reference to the BluetoothDevice by passing in the Context.BLUETOOTH constant as the service name parameter, as shown in the following code snippet: String context = Context.BLUETOOTH_SERVICE; final BluetoothDevice bluetooth = (BluetoothDevice)getSystemService(context); To use the Bluetooth Service, your application needs to have the BLUETOOTH permission as shown here: Controlling the Local Bluetooth Device The Bluetooth Device offers several methods that let you control the Bluetooth hardware. The enable and disable methods let you enable or disable the Bluetooth adapter. The getName and setName methods let you modify the local device name, and getAddress can be used to determine the local device address. You can fi nd and change the discovery mode and discovery time-out settings using the getMode and getDiscoverableTimeout methods and their setter equivalents. The following code snippet enables the Bluetooth adapter and waits until it has connected before changing the device name and setting the mode to “discoverable”: bluetooth.enable(new IBluetoothDeviceCallback.Stub() { }); public void onCreateBondingResult(String _address, int _result) throws RemoteException { String friendlyName = bluetooth.getRemoteName(_address); } public void onEnableResult(int _result) throws RemoteException { if (_result == BluetoothDevice.RESULT_SUCCESS) { bluetooth.setName(“BLACKFANG”); bluetooth.setMode(BluetoothDevice.MODE_DISCOVERABLE); } } Discovering and Bonding with Bluetooth Devices Before you can establish a data communications socket, the local Bluetooth device must fi rst discover, connect, and bond with the remote device. Discovery Looking for remote devices to connect to is called discovery. For other devices to discover your handset, you need to set the mode to “discoverable” or “connectable” using the setMode method as shown previously.
Chapter 10: Accessing Android Hardware To discover other devices, initiate a discovery session using the startDiscovery or startPeriodicDiscovery methods, as shown below: if (discoverPeriodically) bluetooth.startPeriodicDiscovery(); else bluetooth.startDiscovery(true); Both of these calls are asynchronous, broadcasting a REMOTE_DEVICE_FOUND_ACTION whenever a new remote Bluetooth device is discovered. To get a list of the remote devices that have been discovered, call listRemoteDevices on the Bluetooth device object. The returned String array contains the address of each remote device found. You can fi nd their “friendly” names by passing in the device address to getRemoteName. Bonding Bonding, also known as pairing, lets you create an authenticated connection between two Bluetooth devices using a four-digit PIN. This ensures that your Bluetooth connections aren’t hijacked. Android requires you to bond with remote devices before you can establish application-layer communication sessions such as RFCOMM. To bond with a remote device, call the createBonding method on the Bluetooth Device after using setPin to set the unique identifi er PIN to use for this pairing request. To abort the bonding attempt, call cancelBonding and use cancelPin to re-set the PIN if required. Once a remote device has been bonded, it will be added to the native database and will automatically bond with the local device if it is discovered in the future. In the following code snippet, the Bluetooth Service is queried for a list of all the available remote devices. The list is then checked to see if any of these devices are not yet bonded with the local Bluetooth service, in which case, pairing is initiated. String[] devices = bluetooth.listRemoteDevices(); for (String device : devices) { if (!bluetooth.hasBonding(device)) { // Set the pairing PIN. In real life it’s probably a smart // move to make this user enterable and dynamic. bluetooth.setPin(device, new byte[] {1,2,1,2}); bluetooth.createBonding(device, new IBluetoothDeviceCallback.Stub() { public void onCreateBondingResult(String _address, int _result) throws RemoteException { if (_result == BluetoothDevice.RESULT_SUCCESS) { String connectText = “Connected to “ + bluetooth.getRemoteName(_address); Toast.makeText(get<strong>Application</strong>Context(), connectText, Toast.LENGTH_SHORT); } 341
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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, Retrieva
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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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} } Chapter 6: Data Storage, Retrie
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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 7: Maps, Geocoding, and L
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Summary Chapter 7: Maps, Geocoding,
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Chapter 8: Working in the Backgroun
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Peer-to-Peer Communication In this
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Chapter 9: Peer-to-Peer Communicati
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} Chapter 9: Peer-to-Peer Communica
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Handling Subscription Requests Chap
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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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