firebase.firestore().collection('d').doc(deviceid).delete().then(function () {
                                    console.log("Device Deleted");
                                    that.setState({
                                        loading: false
                                    });
                                    Toast.show('Device Deleted Succesfully', {
                                        duration: Toast.durations.SHORT,
                                        position: Toast.positions.TOP,
                                        shadow: true,
                                        animation: true,
                                        hideOnPress: true,
                                        delay: 0,
                                    });

                                }).catch(function (err) {
                                    console.log(err);
                                    that.setState({
                                        loading: false
                                    });
                                })