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   源码介绍

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扫描外围ble蓝牙设备，由mac地址，名称，信号强度，有apk可安装

public class BluetoothLeService extends Service {
	private final static String TAG = "BluetoothLeService";// luetoothLeService.class.getSimpleName();
	private List<Sensor> mEnabledSensors = new ArrayList<Sensor>();
	//蓝牙相关类
	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 =zzzzzzzzzzzzz
	// UUID.fromString(SampleGattAttributes.HEART_RATE_MEASUREMENT);
	private OnDataAvailableListener mOnDataAvailableListener;

	// Implements callback methods for GATT events that the app cares about. For
	// example,
	// connection change and services discovered.

	public interface OnDataAvailableListener {
		public void onCharacteristicRead(BluetoothGatt gatt,
				BluetoothGattCharacteristic characteristic, int status);

		public void onCharacteristicWrite(BluetoothGatt gatt,
				BluetoothGattCharacteristic characteristic);

		public void onCharacteristicChanged(BluetoothGatt gatt,
				BluetoothGattCharacteristic characteristic);
	}

	public void setOnDataAvailableListener(OnDataAvailableListener l)
	{
		mOnDataAvailableListener = l;
	}

	/* 连接远程设备的回调函数 */
	private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback()
	{
		@Override
		public void onConnectionStateChange(BluetoothGatt gatt, int status,
				int newState)
		{
			String intentAction;
			if (newState == BluetoothProfile.STATE_CONNECTED)//连接成功
			{
				intentAction = ACTION_GATT_CONNECTED;
				mConnectionState = STATE_CONNECTED;
				/* 通过广播更新连接状态 */
				broadcastUpdate(intentAction);
				Log.i(TAG, "Connected to GATT server.");
				// Attempts to discover services after successful connection.
				Log.i(TAG, "Attempting to start service discovery:"
						  mBluetoothGatt.discoverServices());

			} else if (newState == BluetoothProfile.STATE_DISCONNECTED)//连接失败
			{
				intentAction = ACTION_GATT_DISCONNECTED;
				mConnectionState = STATE_DISCONNECTED;
				Log.i(TAG, "Disconnected from GATT server.");
				broadcastUpdate(intentAction);
			}
		}
        /*
         * 重写onServicesDiscovered，发现蓝牙服务
         * 
         * */
		@Override
		public void onServicesDiscovered(BluetoothGatt gatt, int status)
		{
			if (status == BluetoothGatt.GATT_SUCCESS)//发现到服务
			{
				broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
				Log.i(TAG, "--onServicesDiscovered called--");
			} else
			{
				Log.w(TAG, "onServicesDiscovered received: "   status);
				System.out.println("onServicesDiscovered received: "   status);
			}
		}
         /*
          * 特征值的读写
          * */
		@Override
		public void onCharacteristicRead(BluetoothGatt gatt,
				BluetoothGattCharacteristic characteristic, int status)
		{
			if (status == BluetoothGatt.GATT_SUCCESS)
			{
				Log.i(TAG, "--onCharacteristicRead called--");
				//从特征值读取数据
				byte[] sucString = characteristic.getValue();
				String string = new String(sucString);
				//将数据通过广播到Ble_Activity
				broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
			}
			
		}
         /*
          * 特征值的改变
          * */
		@Override
		public void onCharacteristicChanged(BluetoothGatt gatt,
				BluetoothGattCharacteristic characteristic)
		{
			System.out.println("                ");
			broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
	
		}
        /*
         * 特征值的写
         * */
		@Override
		public void onCharacteristicWrite(BluetoothGatt gatt,
				BluetoothGattCharacteristic characteristic, int status)
		{
			
			Log.w(TAG, "--onCharacteristicWrite--: "   status);
			// 以下语句实现 发送完数据或也显示到界面上
			broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
		}
        /*
         * 读描述值
         * */
		@Override
		public void onDescriptorRead(BluetoothGatt gatt,
				BluetoothGattDescriptor descriptor, int status)
		{
			// TODO Auto-generated method stub
			// super.onDescriptorRead(gatt, descriptor, status);
			Log.w(TAG, "----onDescriptorRead status: "   status);
			byte[] desc = descriptor.getValue();
			if (desc != null)
			{
				Log.w(TAG, "----onDescriptorRead value: "   new String(desc));
			}

		}
         /*
          * 写描述值
          * */
		@Override
		public void onDescriptorWrite(BluetoothGatt gatt,
				BluetoothGattDescriptor descriptor, int status)
		{
			// TODO Auto-generated method stub
			// super.onDescriptorWrite(gatt, descriptor, status);
			Log.w(TAG, "--onDescriptorWrite--: "   status);
		}
         /*
          * 读写蓝牙信号值
          * */
		@Override
		public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status)
		{
			// TODO Auto-generated method stub
			// super.onReadRemoteRssi(gatt, rssi, status);
			Log.w(TAG, "--onReadRemoteRssi--: "   status);
			broadcastUpdate(ACTION_DATA_AVAILABLE, rssi);
		}

		@Override
		public void onReliableWriteCompleted(BluetoothGatt gatt, int status)
		{
			// TODO Auto-generated method stub
			// super.onReliableWriteCompleted(gatt, status);
			Log.w(TAG, "--onReliableWriteCompleted--: "   status);
		}

	};
    //广播意图
	private void broadcastUpdate(final String action, int rssi)
	{
		final Intent intent = new Intent(action);
		intent.putExtra(EXTRA_DATA, String.valueOf(rssi));
		sendBroadcast(intent);
	}
     //广播意图
	private void broadcastUpdate(final String action)
	{
		final Intent intent = new Intent(action);
		sendBroadcast(intent);
	}

	/* 广播远程发送过来的数据 */
	public void broadcastUpdate(final String action,
			final BluetoothGattCharacteristic characteristic)
	{
		final Intent intent = new Intent(action);
		//从特征值获取数据
		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));

				Log.i(TAG, "***broadcastUpdate: byteChar = "   byteChar);

			}
			intent.putExtra(EXTRA_DATA, new String(data));
			System.out.println("broadcastUpdate for  read data:"
					  new String(data));
		}
		sendBroadcast(intent);
	}

	public class LocalBinder extends Binder {
		public BluetoothLeService getService()
		{
			return BluetoothLeService.this;
		}
	}

	@Override
	public IBinder onBind(Intent intent)
	{
		return mBinder;
	}

	@Override
	public boolean onUnbind(Intent intent)
	{
		close();
		return super.onUnbind(intent);
	}

	private final IBinder mBinder = new LocalBinder();
	
	

	/**
	 * Initializes a reference to the local Bluetooth adapter.
	 * 
	 * @return Return true if the initialization is successful.
	 */
	/* service 中蓝牙初始化 */
	public boolean initialize()
	{
		// For API level 18 and above, get a reference to BluetoothAdapter
		// through
		// BluetoothManager.
		if (mBluetoothManager == null)
		{   //获取系统的蓝牙管理器
			mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
			if (mBluetoothManager == null)
			{
				Log.e(TAG, "Unable to initialize BluetoothManager.");
				return false;
			}
		}
          
		mBluetoothAdapter = mBluetoothManager.getAdapter();
		if (mBluetoothAdapter == null)
		{
			Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
			return false;
		}

		return true;
	}

	/**
	 * Connects to the GATT server hosted on the Bluetooth LE device.
	 * 
	 * @param address
	 *            The device address of the destination device.
	 * 
	 * @return Return true if the connection is initiated successfully. The
	 *         connection result is reported asynchronously through the
	 *         {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
	 *         callback.
	 */
	// 连接远程蓝牙
	public boolean connect(final String address)
	{
		if (mBluetoothAdapter == null || address == null)
		{
			Log.w(TAG,
					"BluetoothAdapter not initialized or unspecified address.");
			return false;
		}

		// Previously connected device. Try to reconnect.
		if (mBluetoothDeviceAddress != null
				&& address.equals(mBluetoothDeviceAddress)
				&& mBluetoothGatt != null)
		{
			Log.d(TAG,
					"Trying to use an existing mBluetoothGatt for connection.");
			if (mBluetoothGatt.connect())//连接蓝牙，其实就是调用BluetoothGatt的连接方法
			{
				mConnectionState = STATE_CONNECTING;
				return true;
			} else
			{
				return false;
			}
		}
		/* 获取远端的蓝牙设备 */
		final BluetoothDevice device = mBluetoothAdapter
				.getRemoteDevice(address);
		if (device == null)
		{
			Log.w(TAG, "Device not found.  Unable to connect.");
			return false;
		}
		// We want to directly connect to the device, so we are setting the
		// autoConnect
		// parameter to false.
		/* 调用device中的connectGatt连接到远程设备 */
		mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
		Log.d(TAG, "Trying to create a new connection.");
		mBluetoothDeviceAddress = address;
		mConnectionState = STATE_CONNECTING;
		System.out.println("device.getBondState=="   device.getBondState());
		return true;
	}

	/**
	 * Disconnects an existing connection or cancel a pending connection. The
	 * disconnection result is reported asynchronously through the
	 * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
	 * callback.
	 */
	/*
	 * 取消连接
	 * 
	 * */
	/** 
	* @Title: disconnect 
	* @Description: TODO(取消蓝牙连接) 
	* @param
	* @return void    
	* @throws 
	*/ 
	public void disconnect()
	{
		if (mBluetoothAdapter == null || mBluetoothGatt == null)
		{
			Log.w(TAG, "BluetoothAdapter not initialized");
			return;
		}
		mBluetoothGatt.disconnect();

	}

	/**
	 * After using a given BLE device, the app must call this method to ensure
	 * resources are released properly.
	 */
	/** 
	* @Title: close 
	* @Description: TODO(关闭所有蓝牙连接) 
	* @param
	* @return void   
	* @throws 
	*/ 
	public void close()
	{
		if (mBluetoothGatt == null)
		{
			return;
		}
		mBluetoothGatt.close();
		mBluetoothGatt = null;
	}

	/**
	 * Request a read on a given {@code BluetoothGattCharacteristic}. The read
	 * result is reported asynchronously through the
	 * {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
	 * callback.
	 * 
	 * @param characteristic
	 *            The characteristic to read from.
	 */
	/** 
	* @Title: readCharacteristic 
	* @Description: TODO(读取特征值) 
	* @param @param characteristic（要读的特征值）
	* @return void    返回类型 
	* @throws 
	*/ 
	public void readCharacteristic(BluetoothGattCharacteristic characteristic)
	{
		if (mBluetoothAdapter == null || mBluetoothGatt == null)
		{
			Log.w(TAG, "BluetoothAdapter not initialized");
			return;
		}
		mBluetoothGatt.readCharacteristic(characteristic);

	}

	// 写入特征值
	public void writeCharacteristic(BluetoothGattCharacteristic characteristic)
	{
		if (mBluetoothAdapter == null || mBluetoothGatt == null)
		{
			Log.w(TAG, "BluetoothAdapter not initialized");
			return;
		}
		mBluetoothGatt.writeCharacteristic(characteristic);

	}

	// 读取RSSi
	public void readRssi()
	{
		if (mBluetoothAdapter == null || mBluetoothGatt == null)
		{
			Log.w(TAG, "BluetoothAdapter not initialized");
			return;
		}
		mBluetoothGatt.readRemoteRssi();
	}

	/**
	 * Enables or disables notification on a give characteristic.
	 * 
	 * @param characteristic
	 *            Characteristic to act on.
	 * @param enabled
	 *            If true, enable notification. False otherwise.
	 */
	/** 
	* @Title: setCharacteristicNotification 
	* @Description: TODO(设置特征值通变化通知) 
	* @param @param characteristic（特征值）
	* @param @param enabled （使能）   
	* @return void    
	* @throws 
	*/ 
	public void setCharacteristicNotification(
			BluetoothGattCharacteristic characteristic, boolean enabled)
	{
		if (mBluetoothAdapter == null || mBluetoothGatt == null)
		{
			Log.w(TAG, "BluetoothAdapter not initialized");
			return;
		}
		mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

		BluetoothGattDescriptor clientConfig = characteristic
				.getDescriptor(UUID
						.fromString("00002902-0000-1000-8000-00805f9b34fb"));

		if (enabled)
		{
			clientConfig
					.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
		} else
		{
			clientConfig
					.setValue(BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE);
		}
		mBluetoothGatt.writeDescriptor(clientConfig);
	}

	/** 
	* @Title: getCharacteristicDescriptor 
	* @Description: TODO(得到特征值下的描述值) 
	* @param @param 无
	* @return void   
	* @throws 
	*/ 
	public void getCharacteristicDescriptor(BluetoothGattDescriptor descriptor)
	{
		if (mBluetoothAdapter == null || mBluetoothGatt == null)
		{
			Log.w(TAG, "BluetoothAdapter not initialized");
			return;
		}

		mBluetoothGatt.readDescriptor(descriptor);
	}

	/**
	 * Retrieves a list of supported GATT services on the connected device. This
	 * should be invoked only after {@code BluetoothGatt#discoverServices()}
	 * completes successfully.
	 * 
	 * @return A {@code List} of supported services.
	 */
	/** 
	* @Title: getSupportedGattServices 
	* @Description: TODO(得到蓝牙的所有服务) 
	* @param @return    无
	* @return List<BluetoothGattService>    
	* @throws 
	*/ 
	public List<BluetoothGattService> getSupportedGattServices()
	{
		if (mBluetoothGatt == null)
			return null;
		return mBluetoothGatt.getServices();

	}

}