Bluetooth -Android Programming

  Android supports Bluetooth for wireless connectivity. It comes with API of android bluetooth.


We have different classes in the API

BluetoothAdapter: It represents local Bluetooth Adapter.Using this class, we can discover the devices near by.Uisng this we can create BluetoothServerSocket for listening from other devices.

 BluetoothDevice: By using this we can request connection to remote device through BluetoothSocket.

BluetoothSocket: We can exchange the data with other Bluetooth Device.

BluetoothServerSocket: it listens the incoming request. To connect any device, one device  must open a server socket.


BluetoothProfile:It is an interface for wireless devices.

Bluetooth: Using this class, we can connect to Bluetooth Headset.

BluetoothHealth: It represents a health device profile that controls Bluetooth service.
BluetoothA2dp(Advanced Audio Distribution Profile): It tells how audio quality streamed from one mobile to other .

BluetoothProfile.ServiceListener: It gives notification when the client connects or disconnects.


To use Bluetooth in Android, we need to declare permissions in manifest.xml

 <uses-permission android:name="android.permission.BLUETOOTH" />
 <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />


How to check whether the device support Bluetooth or not?

BluetoothAdapter btAdapter=BluetoothAdapter.getDefaultAdapter();
if( btAdapter==null){
//device doesnot support Bluetooth.
 }
else{ //device support bluetooth.


How to enable Bluetooth:

 //Prompt user to turn on Bluetooth

Intent enableI = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(enableI, REQUEST_ENABLE_BT);

        // Set up a pointer to  remote node using address.
        BluetoothDevice device = btAdapter.getRemoteDevice(address);  


/ Establish connection. 
  bltSocket.connect();