我英語不好。敬請諒解。我想知道藍牙設(shè)置何時完成。我想在藍牙連接和設(shè)置完成后將數(shù)據(jù)發(fā)送到我的設(shè)備。我如何知道流打開何時完成？當(dāng)我嘗試所有 BLE 設(shè)置時，我只是睡了幾秒鐘，但我想將其更改為順序代碼。private class GattClientCallback extends BluetoothGattCallback {@Override        public void onServicesDiscovered( BluetoothGatt _gatt, int _status ) {            super.onServicesDiscovered( _gatt, _status );            // check if the discovery failed            if( _status != BluetoothGatt.GATT_SUCCESS ) {                Log.e( TAG, "Device service discovery failed, status: " + _status );                return;            }            // find discovered characteristics            List<BluetoothGattCharacteristic> matching_characteristics= BluetoothUtils.findBLECharacteristics(_gatt);            if( matching_characteristics.isEmpty() ) {                Log.e( TAG, "Unable to find characteristics" );                return;            }            // log for successful discovery            Log.d( TAG, "Services discovery is successful" );            // find command characteristics from the GATT server            cmd_characteristic= BluetoothUtils.findCommandCharacteristic( ble_gatt_ );            //setCharacteristicNotification            ble_gatt_.setCharacteristicNotification(cmd_characteristic, true);            BluetoothGattDescriptor descriptor = cmd_characteristic.getDescriptor(CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID);            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);            ble_gatt_.writeDescriptor(descriptor); //descriptor write operation successfully started?            // stream open complete.            // update the connection status message            msg_handler(SET_TV_STATUS,"connection complete");        }}