android BluetoothLE 多个 setCharacteristicNotification writeCharacteristic 失效

 如果在搜索完服务后，执行多个 setCharacteristicNotification 或 writeCharacteristic 操作，某些操作可能会无效。需要在中间等待一些时间，真是一个大坑！

new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            for (BluetoothGattService gattService : mBluetoothLeService.getSupportedGattServices()) {
                List<BluetoothGattCharacteristic> gattCharacteristics = gattService.getCharacteristics();
                for (BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics) {
                    if (gattCharacteristic.getUuid().toString().equals("0000XXXX-0000-XXXX-XXXX-00XXXXXXXXXX")) {
                        Thread.sleep(150);
                        mgattCharacteristic = gattCharacteristic;
                        byte[] value = new byte[7];
　　　　　　　　　　　　　　/*
　　　　　　　　　　　　　　　　value = ......
　　　　　　　　　　　　　　*/
                        mgattCharacteristic.setValue(value);
                        mBluetoothLeService.writeCharacteristic(mgattCharacteristic);
                    }
                    if (gattCharacteristic.getUuid().toString().equals("0000XXXX-0000-XXXX-XXXX-00XXXXXXXXXX")){

                        Thread.sleep(150);
                        mBluetoothLeService.setCharacteristicNotification(gattCharacteristic, true);
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}).start();