android_ble

	// 初始化 Bluetooth adapter, 通过蓝牙管理器得到一个参考蓝牙适配器(API必须在以上android4.3或以上和版本)
	final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
	mBluetoothAdapter = bluetoothManager.getAdapter();

	// 检查设备上是否支持蓝牙
	if (mBluetoothAdapter == null) {
		Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
		finish();
		return;
		
		
		###打开蓝牙
		
		// 为了确保设备上蓝牙能使用, 如果当前蓝牙设备没启用,弹出对话框向用户要求授予权限来启用
	if (!mBluetoothAdapter.isEnabled()) {
		if (!mBluetoothAdapter.isEnabled()) {
			Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
			startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
		}
	}
	
	###扫描蓝牙
	
	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);
				invalidateOptionsMenu();
			}
		}, SCAN_PERIOD);

		mScanning = true;
		mBluetoothAdapter.startLeScan(mLeScanCallback);
	} else {
		mScanning = false;
		mBluetoothAdapter.stopLeScan(mLeScanCallback);
	}
	invalidateOptionsMenu();
}
	
	
	
	扫描后的回调
	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();
			}
		});
	}
};


###连接蓝牙

		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);
	}
	

###写数据 读数据
连接上后，要根据特定的特性，去读写，因为有的特性没有读写权限，这时需要知道蓝牙的uuid 去匹配

byte[] bytes=new byte[]{(byte) 0xDD};
				//	byte[] bytes=new byte[]{(byte) 0xCC};
				mNotifyCharacteristic.setValue(bytes);
				//mNotifyCharacteristic.setValue(sendmsg);
				BluetoothLeService.mBluetoothGatt
				.writeCharacteristic(mNotifyCharacteristic);

}

###  国产安卓蓝牙机器，千变万化，开发起来虽然不难，但兼容性，却是个大问题，利用安卓APi开发。