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Once you have the local adapter, you can get a set of BluetoothDevice objects representing all paired devices with getBondedDevices() start device discovery with startDiscovery() or create a BluetoothServerSocket to listen for incoming connection requests with listenUsingRfcommWithServiceRecord(String, UUID) or start a scan for Bluetooth LE devices with startLeScan(LeScanCallback). Fundamentally, this is your starting point for all Bluetooth actions. To get a BluetoothAdapter representing the local Bluetooth adapter, when running on JELLY_BEAN_MR1 and below, call the static getDefaultAdapter() method when running on JELLY_BEAN_MR2 and higher, call getAdapter(). The BluetoothAdapter lets you perform fundamental Bluetooth tasks, such as initiate device discovery, query a list of bonded (paired) devices, instantiate a BluetoothDevice using a known MAC address, and create a BluetoothServerSocket to listen for connection requests from other devices, and start a scan for Bluetooth LE devices. Represents the local device Bluetooth adapter.