Android 4.3 (API Level 18) introduces built-in platform support for Bluetooth Low Energy in the central role and provides APIs that apps can use to discover devices, query for services, and read/write characteristics. In contrast to Classic Bluetooth, Bluetooth Low Energy (BLE) is designed to provide significantly lower power consumption. This allows Android apps to communicate with BLE devices that have low power requirements, such as proximity sensors, heart rate monitors, fitness devices, and so on.

Key Terms and Concepts

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Here is a summary of key BLE terms and concepts:

• Generic Attribute Profile (GATT)—The
  GATT profile is a general specification for sending and receiving short
  pieces of data known as "attributes" over a BLE link. All current Low
  Energy application profiles are
  based on GATT.
  • The Bluetooth SIG defines many profiles for
    Low Energy devices.
    A profile is a specification for how a device works in a particular
    application. Note that a device can implement more than one profile. For
    example, a device could contain a heart rate monitor and a battery
    level detector.
• Attribute Protocol (ATT)—GATT
  is built on top of the Attribute Protocol (ATT). This is also referred
  to as GATT/ATT. ATT is optimized to run on BLE devices. To this end, it
  uses as few bytes as possible. Each
  attribute is uniquely identified by a Universally Unique Identifier
  (UUID), which is a standardized 128-bit format for a string ID used to
  uniquely identify information. The attributestransported by ATT are formatted as characteristics and services.
• Characteristic—A
  characteristic contains a single value and 0-n descriptors that
  describe the characteristic's value. A characteristic can be thought of
  as a type, analogous to a class.
• Descriptor—Descriptors
  are defined attributes that describe a characteristic value. For
  example, a descriptor might specify a human-readable description, an
  acceptable range for a characteristic's value, or a
  unit of measure that is specific to a characteristic's value.
• Service—A
  service is a collection of characteristics. For example, you could have
  a service called "Heart Rate Monitor" that includes characteristics
  such as "heart rate measurement." You can find a list of existing
  GATT-based profiles and services on bluetooth.org.

Roles and Responsibilities

Here are the roles and responsibilities that apply when an Android device interacts with a BLE device:

• Central vs. peripheral. This applies to
  the BLE connection itself. The device in the central role scans, looking
  for advertisement, and the device in the peripheral role makes the
  advertisement.
• GATT server vs. GATT client. This determines how two devices talk to each other once they've established the connection.

To understand the
distinction, imagine that you have an Android phone and an activity
tracker that is a BLE device. The phone supports the central role; the
activity tracker supports the peripheral role (to establish
a BLE connection you need one of each—two things that only support
peripheral couldn't talk to each other, nor could two things that only
support central).

Once the phone and the
activity tracker have established a connection, they start transferring
GATT metadata to one another. Depending on the kind of data they
transfer, one or the other might act as the server.
For example, if the activity tracker wants to report sensor data to the
phone, it might make sense for the activity tracker to act as the
server. If the activity tracker wants to receive updates from the phone,
then it might make sense for the phone to act
as the server.

In the example used in
this document, the Android app (running on an Android device) is the
GATT client. The app gets data from the GATT server, which is a BLE
heart rate monitor that supports the Heart
Rate Profile. But you could alternatively design your Android app to play the GATT server role. See BluetoothGattServer for
more information.

BLE Permissions

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In order to use Bluetooth features in your application, you must declare the Bluetooth permission BLUETOOTH.
You need this permission to perform any Bluetooth communication, such
as requesting a connection, accepting a connection, and transferring
data.

If you want your app to initiate device discovery or manipulate Bluetooth settings, you must also declare theBLUETOOTH_ADMIN permission. Note: If
you use the BLUETOOTH_ADMIN permission,
then you must also have theBLUETOOTH permission.

Declare the Bluetooth permission(s) in your application manifest file. For example:

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

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

If you want to declare that your app is available to BLE-capable devices only, include the following in your app's manifest:

<uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>

However, if you want to make your app available to devices that don't support BLE, you should still include this element in your app's manifest, but set required="false". Then at run-time you can determine BLE availability by using PackageManager.hasSystemFeature():

// Use this check to determine whether BLE is supported on the device. Then

// you can selectively disable BLE-related features.

if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {

    Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();

    finish();

}

Setting Up BLE

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Before your application can communicate over BLE, you need to verify that BLE is supported on the device, and if so, ensure that it is enabled. Note that this check is only necessary if <uses-feature.../> is set to false.

If BLE is not supported, then you should gracefully disable any BLE features. If BLE is supported, but disabled, then you can request that the user enable Bluetooth without leaving your application. This setup is accomplished in two steps, using the BluetoothAdapter.

1. Get the BluetoothAdapter

   The BluetoothAdapter is required for any and all Bluetooth activity. The BluetoothAdapter represents the device's own Bluetooth adapter (the Bluetooth radio). There's one Bluetooth adapter for the entire system, and your application can interact with it using this object. The snippet below shows how to get the adapter. Note that this approach uses getSystemService() to return an instance of BluetoothManager, which is then used to get the adapter. Android 4.3 (API Level 18) introduces BluetoothManager:

   // Initializes Bluetooth adapter.
   
   final BluetoothManager bluetoothManager =
   
           (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
   
   mBluetoothAdapter = bluetoothManager.getAdapter();

2. Enable Bluetooth

   Next, you need to ensure that Bluetooth is enabled. Call isEnabled() to check whether Bluetooth is currently enabled. If this method returns false, then Bluetooth is disabled. The following snippet checks whether Bluetooth is enabled. If it isn't, the snippet displays an error prompting the user to Go to Settings to enable Bluetooth:

   private BluetoothAdapter mBluetoothAdapter;
   
   ...
   
   // Ensures Bluetooth is available on the device and it is enabled. If not,
   
   // displays a dialog requesting user permission to enable Bluetooth.
   
   if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
   
       Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
   
       startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
   
   }

Finding BLE Devices

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To find BLE devices, you use the startLeScan() method. This method takes a BluetoothAdapter.LeScanCallbackas a parameter. You must implement this callback, because that is how scan results are returned. Because scanning is battery-intensive, you should observe the following guidelines:

• As soon as you find the desired device, stop scanning.
• Never scan on a loop, and set a time limit on your scan. A device that was previously available may have moved out of range, and continuing to scan drains the battery.

The following snippet shows how to start and stop a scan:

/**

 * Activity for scanning and displaying available BLE devices.

 */

public class DeviceScanActivity extends ListActivity {

    private BluetoothAdapter mBluetoothAdapter;

    private boolean mScanning;

    private Handler mHandler;

    // Stops scanning after 10 seconds.

    private static final long SCAN_PERIOD = 10000;

    ...

    private void scanLeDevice(final boolean enable) {

        if (enable) {

            // Stops scanning after a pre-defined scan period.

            mHandler.postDelayed(new Runnable() {

                @Override

                public void run() {

                    mScanning = false;

                    mBluetoothAdapter.stopLeScan(mLeScanCallback);

                }

            }, SCAN_PERIOD);

            mScanning = true;

            mBluetoothAdapter.startLeScan(mLeScanCallback);

        } else {

            mScanning = false;

            mBluetoothAdapter.stopLeScan(mLeScanCallback);

        }

        ...

    }

...

}

If you want to scan for only specific types of peripherals, you can instead call startLeScan(UUID[], BluetoothAdapter.LeScanCallback), providing an array of UUID objects that specify the GATT services your app supports.

Here is an implementation of the BluetoothAdapter.LeScanCallback, which is the interface used to deliver BLE scan results:

private LeDeviceListAdapter mLeDeviceListAdapter;

...

// Device scan callback.

private BluetoothAdapter.LeScanCallback mLeScanCallback =

        new BluetoothAdapter.LeScanCallback() {

    @Override

    public void onLeScan(final BluetoothDevice device, int rssi,

            byte[] scanRecord) {

        runOnUiThread(new Runnable() {

           @Override

           public void run() {

               mLeDeviceListAdapter.addDevice(device);

               mLeDeviceListAdapter.notifyDataSetChanged();

           }

       });

   }

};

Note: You can only scan for Bluetooth LE devices or scan for Classic Bluetooth devices, as described inBluetooth. You cannot scan for both Bluetooth LE and classic devices at the same time.

Connecting to a GATT Server

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The first step in interacting with a BLE device is connecting to it— more specifically, connecting to the GATT server on the device. To connect to a GATT server on a BLE device, you use the connectGatt() method. This method takes three parameters: a Context object, autoConnect (boolean indicating whether to automatically connect to the BLE device as soon as it becomes available), and a reference to a BluetoothGattCallback:

mBluetoothGatt = device.connectGatt(this, false, mGattCallback);

This connects to the GATT server hosted by the BLE device, and returns a BluetoothGatt instance, which you can then use to conduct GATT client operations. The caller (the Android app) is the GATT client. TheBluetoothGattCallback is used to deliver results to the client, such as connection status, as well as any further GATT client operations.

In this example, the BLE app provides an activity (DeviceControlActivity) to connect, display data, and display GATT services and characteristics supported by the device. Based on user input, this activity communicates with a Service called BluetoothLeService, which interacts with the BLE device via the Android BLE API:

// A service that interacts with the BLE device via the Android BLE API.

public class BluetoothLeService extends Service {

    private final static String TAG = BluetoothLeService.class.getSimpleName();

    private BluetoothManager mBluetoothManager;

    private BluetoothAdapter mBluetoothAdapter;

    private String mBluetoothDeviceAddress;

    private BluetoothGatt mBluetoothGatt;

    private int mConnectionState = STATE_DISCONNECTED;

    private static final int STATE_DISCONNECTED = 0;

    private static final int STATE_CONNECTING = 1;

    private static final int STATE_CONNECTED = 2;

    public final static String ACTION_GATT_CONNECTED =

            "com.example.bluetooth.le.ACTION_GATT_CONNECTED";

    public final static String ACTION_GATT_DISCONNECTED =

            "com.example.bluetooth.le.ACTION_GATT_DISCONNECTED";

    public final static String ACTION_GATT_SERVICES_DISCOVERED =

            "com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED";

    public final static String ACTION_DATA_AVAILABLE =

            "com.example.bluetooth.le.ACTION_DATA_AVAILABLE";

    public final static String EXTRA_DATA =

            "com.example.bluetooth.le.EXTRA_DATA";

    public final static UUID UUID_HEART_RATE_MEASUREMENT =

            UUID.fromString(SampleGattAttributes.HEART_RATE_MEASUREMENT);

    // Various callback methods defined by the BLE API.

    private final BluetoothGattCallback mGattCallback =

            new BluetoothGattCallback() {

        @Override

        public void onConnectionStateChange(BluetoothGatt gatt, int status,

                int newState) {

            String intentAction;

            if (newState == BluetoothProfile.STATE_CONNECTED) {

                intentAction = ACTION_GATT_CONNECTED;

                mConnectionState = STATE_CONNECTED;

                broadcastUpdate(intentAction);

                Log.i(TAG, "Connected to GATT server.");

                Log.i(TAG, "Attempting to start service discovery:" +

                        mBluetoothGatt.discoverServices());

            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {

                intentAction = ACTION_GATT_DISCONNECTED;

                mConnectionState = STATE_DISCONNECTED;

                Log.i(TAG, "Disconnected from GATT server.");

                broadcastUpdate(intentAction);

            }

        }

        @Override

        // New services discovered

        public void onServicesDiscovered(BluetoothGatt gatt, int status) {

            if (status == BluetoothGatt.GATT_SUCCESS) {

                broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);

            } else {

                Log.w(TAG, "onServicesDiscovered received: " + status);

            }

        }

        @Override

        // Result of a characteristic read operation

        public void onCharacteristicRead(BluetoothGatt gatt,

                BluetoothGattCharacteristic characteristic,

                int status) {

            if (status == BluetoothGatt.GATT_SUCCESS) {

                broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);

            }

        }

     ...

    };

...

}

When a particular callback is triggered, it calls the appropriate broadcastUpdate() helper method and passes it an action. Note that the data parsing in this section is performed in accordance with the Bluetooth Heart Rate Measurement profile specifications:

private void broadcastUpdate(final String action) {

    final Intent intent = new Intent(action);

    sendBroadcast(intent);

}

private void broadcastUpdate(final String action,

                             final BluetoothGattCharacteristic characteristic) {

    final Intent intent = new Intent(action);

    // This is special handling for the Heart Rate Measurement profile. Data

    // parsing is carried out as per profile specifications.

    if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) {

        int flag = characteristic.getProperties();

        int format = -1;

        if ((flag & 0x01) != 0) {

            format = BluetoothGattCharacteristic.FORMAT_UINT16;

            Log.d(TAG, "Heart rate format UINT16.");

        } else {

            format = BluetoothGattCharacteristic.FORMAT_UINT8;

            Log.d(TAG, "Heart rate format UINT8.");

        }

        final int heartRate = characteristic.getIntValue(format, 1);

        Log.d(TAG, String.format("Received heart rate: %d", heartRate));

        intent.putExtra(EXTRA_DATA, String.valueOf(heartRate));

    } else {

        // For all other profiles, writes the data formatted in HEX.

        final byte[] data = characteristic.getValue();

        if (data != null && data.length > 0) {

            final StringBuilder stringBuilder = new StringBuilder(data.length);

            for(byte byteChar : data)

                stringBuilder.append(String.format("%02X ", byteChar));

            intent.putExtra(EXTRA_DATA, new String(data) + "\n" +

                    stringBuilder.toString());

        }

    }

    sendBroadcast(intent);

}

Back in DeviceControlActivity, these events are handled by a BroadcastReceiver:

// Handles various events fired by the Service.

// ACTION_GATT_CONNECTED: connected to a GATT server.

// ACTION_GATT_DISCONNECTED: disconnected from a GATT server.

// ACTION_GATT_SERVICES_DISCOVERED: discovered GATT services.

// ACTION_DATA_AVAILABLE: received data from the device. This can be a

// result of read or notification operations.

private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {

    @Override

    public void onReceive(Context context, Intent intent) {

        final String action = intent.getAction();

        if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) {

            mConnected = true;

            updateConnectionState(R.string.connected);

            invalidateOptionsMenu();

        } else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {

            mConnected = false;

            updateConnectionState(R.string.disconnected);

            invalidateOptionsMenu();

            clearUI();

        } else if (BluetoothLeService.

                ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {

            // Show all the supported services and characteristics on the

            // user interface.

            displayGattServices(mBluetoothLeService.getSupportedGattServices());

        } else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {

            displayData(intent.getStringExtra(BluetoothLeService.EXTRA_DATA));

        }

    }

};

Reading BLE Attributes

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Once your Android app has connected to a GATT server and discovered services, it can read and write attributes, where supported. For example, this snippet iterates through the server's services and characteristics and displays them in the UI:

public class DeviceControlActivity extends Activity {

    ...

    // Demonstrates how to iterate through the supported GATT

    // Services/Characteristics.

    // In this sample, we populate the data structure that is bound to the

    // ExpandableListView on the UI.

    private void displayGattServices(List<BluetoothGattService> gattServices) {

        if (gattServices == null) return;

        String uuid = null;

        String unknownServiceString = getResources().

                getString(R.string.unknown_service);

        String unknownCharaString = getResources().

                getString(R.string.unknown_characteristic);

        ArrayList<HashMap<String, String>> gattServiceData =

                new ArrayList<HashMap<String, String>>();

        ArrayList<ArrayList<HashMap<String, String>>> gattCharacteristicData

                = new ArrayList<ArrayList<HashMap<String, String>>>();

        mGattCharacteristics =

                new ArrayList<ArrayList<BluetoothGattCharacteristic>>();

        // Loops through available GATT Services.

        for (BluetoothGattService gattService : gattServices) {

            HashMap<String, String> currentServiceData =

                    new HashMap<String, String>();

            uuid = gattService.getUuid().toString();

            currentServiceData.put(

                    LIST_NAME, SampleGattAttributes.

                            lookup(uuid, unknownServiceString));

            currentServiceData.put(LIST_UUID, uuid);

            gattServiceData.add(currentServiceData);

            ArrayList<HashMap<String, String>> gattCharacteristicGroupData =

                    new ArrayList<HashMap<String, String>>();

            List<BluetoothGattCharacteristic> gattCharacteristics =

                    gattService.getCharacteristics();

            ArrayList<BluetoothGattCharacteristic> charas =

                    new ArrayList<BluetoothGattCharacteristic>();

           // Loops through available Characteristics.

            for (BluetoothGattCharacteristic gattCharacteristic :

                    gattCharacteristics) {

                charas.add(gattCharacteristic);

                HashMap<String, String> currentCharaData =

                        new HashMap<String, String>();

                uuid = gattCharacteristic.getUuid().toString();

                currentCharaData.put(

                        LIST_NAME, SampleGattAttributes.lookup(uuid,

                                unknownCharaString));

                currentCharaData.put(LIST_UUID, uuid);

                gattCharacteristicGroupData.add(currentCharaData);

            }

            mGattCharacteristics.add(charas);

            gattCharacteristicData.add(gattCharacteristicGroupData);

         }

    ...

    }

...

}

Receiving GATT Notifications

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It's common for BLE apps to ask to be notified when a particular characteristic changes on the device. This snippet shows how to set a notification for a characteristic, using the setCharacteristicNotification()method:

private BluetoothGatt mBluetoothGatt;

BluetoothGattCharacteristic characteristic;

boolean enabled;

...

mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

...

BluetoothGattDescriptor descriptor = characteristic.getDescriptor(

        UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));

descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);

mBluetoothGatt.writeDescriptor(descriptor);

Once notifications are enabled for a characteristic, an onCharacteristicChanged() callback is triggered if the characteristic changes on the remote device:

@Override

// Characteristic notification

public void onCharacteristicChanged(BluetoothGatt gatt,

        BluetoothGattCharacteristic characteristic) {

    broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);

}

Closing the Client App

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Once your app has finished using a BLE device, it should call close() so the system can release resources appropriately:

public void close() {

    if (mBluetoothGatt == null) {

        return;

    }

    mBluetoothGatt.close();

    mBluetoothGatt = null;

}