最近在做一个蓝牙的项目，是Blu4.0，Android系统支持是4.3版本以上（为此特地卖了个手机，）。

当然也参考了不少大牛的的微博，说的都不错，再次特地感谢

http://blog.csdn.net/hellogv/article/details/6036849

http://blog.csdn.net/hellogv/article/details/6042091

http://www.cnblogs.com/zdz8207/archive/2012/10/17/bluetooth_ble_android.html

http://blog.csdn.net/changemyself/article/details/8454633

http://blog.csdn.net/hellogv/article/details/24267685

调试Ble硬件的读写的App

http://www.wandoujia.com/apps/com.siflink.ble.mgr

这个App，可以在自己app为开发好的情况下，简单的测试下读写特征值，不知道为什么，好像只能写入一个值。也许是我不知道怎么写入多个值。

下面这个是从github上搜索的一个ble4.0的代码

https://github.com/StevenRudenko/BleSensorTag

网上有很多关于Ble4.0的开发，再次也不做介绍，反正都是差不多的。

1、声明蓝牙的权限

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

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

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

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

2、监听搜索的回调

BleBluetoothGattCallback gattCallback = new BleBluetoothGattCallback();

	gattCallback.setOnBleReadCallback(new OnBleReadCallback() {

		public void onReadData(byte[] data) {

	}

	public void onReadComple() {

		McLog.mByStackTrace();

	}

	public void onConnect() {

		showToast("连接设备成功");

		isConnect = true;

	}

	public void onDisConnect() {

		showToast("断开设备");

		isConnect = false;

	}

});

BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() {

		public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {

			McLog.mByStackTrace();

			String address = device.getAddress();

			String name = device.getName();

			String t = name + "[" + address + "]";

			McLog.i("find a device %s", t);

			if (isRightDevice(device)) { // 判断是否是自己的想要的设备

				btAdapter.stopLeScan(this);

				// 进行请求的链接

				device.connectGatt(context, false, gattCallback);

				McLog.i("device %s is this account's.", t);

			} else {

				McLog.i("device %s is not this account's.", t);

			}

		}

	};

BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);

btAdapter = bluetoothManager.getAdapter();

btAdapter.startLeScan(leScanCallback);

3、设置请求链接的回调

public class BleBluetoothGattCallback extends BluetoothGattCallback {

	public static final UUID SERVER_UUID = UUID.fromString("0000FFF0-0000-1000-8000-00805F9B34FB");

	OnBleReadCallback onBleReadCallback;

	public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { // 链接状态的改变的回调

		McLog.mByStackTrace();

		McLog.i("status = " + status);

		McLog.i("newState = " + newState);

		switch (newState) {

			case BluetoothProfile.STATE_CONNECTED:

				McLog.e("STATE_CONNECTED"); // 链接成功

				gatt.discoverServices();

				if (onBleReadCallback != null) {

					onBleReadCallback.onConnect();

				}

				break;

			case BluetoothProfile.STATE_DISCONNECTED:

				gatt.close();

				McLog.e("STATE_DISCONNECTED");// 断开链接

				if (onBleReadCallback != null) {

					onBleReadCallback.onDisConnect();

				}

				break;

			case BluetoothProfile.STATE_CONNECTING:

				McLog.e("STATE_CONNECTING");

				break;

			case BluetoothProfile.STATE_DISCONNECTING:

				McLog.e("STATE_DISCONNECTING");

				break;

		}

	}

	public void onServicesDiscovered(final BluetoothGatt gatt, int status) { // <span style="font-family: Arial, Helvetica, sans-serif;">发现服务的回调</span>

		McLog.mByStackTrace();

		McLog.i("status = " + status);

		if (status == BluetoothGatt.GATT_SUCCESS) {

			BluetoothGattService service = gatt.getService(SERVER_UUID);

			McLog.i("service = " + service);

			if (service != null) {

				// 找到服务后，可以进行读取数据和写入数据

			}

		} else {

			// McToastUtil.show("discover services fail.");

		}

	}

	public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {// 读取特征值的回调

		McLog.i("onCharacteristicRead");

		UUID currentUUId = characteristic.getUuid();

		McLog.i("currentUUId = " + currentUUId);

		if (currentUUId == null) {

			return;

		}

		// 数据的内容

		byte[] data = characteristic.getValue();

		McLog.i("data = " + Arrays.toString(data));

	}

	public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {// 写入特征值回调

		McLog.i("onCharacteristicWrite status = " + status);

	}

	public void setOnBleReadCallback(OnBleReadCallback onBleReadCallback) {

		this.onBleReadCallback = onBleReadCallback;

	}

	public interface OnBleReadCallback { // 自己定义的回调

		void onConnect();

		void onReadData(byte[] data);

		void onReadComple();

		void onDisConnect();

	}

}

最后特别重要的是，一定好配合硬件工程师调试蓝牙。