Common Events of the NFC Subsystem

This document lists the common system events provided by the NFC subsystem to applications. Applications can use APIs to subscribe to common system events.

COMMON_EVENT_NFC_ACTION_ADAPTER_STATE_CHANGED

Indicates that the state of the device NFC adapter has changed.

• Value: usual.event.nfc.action.ADAPTER_STATE_CHANGED
• Required subscriber permissions: none

When the state of the device NFC adapter changes, the event notification service is triggered to publish this event.

COMMON_EVENT_NFC_ACTION_RF_FIELD_ON_DETECTED

Indicates that the NFC RF field is on.

• Value: usual.event.nfc.action.RF_FIELD_ON_DETECTED
• Required subscriber permissions: ohos.permission.MANAGE_SECURE_SETTINGS

When the NFC RF field becomes available, the event notification service is triggered to publish this event.

COMMON_EVENT_NFC_ACTION_RF_FIELD_OFF_DETECTED

Indicates that the NFC RF field is off.

• Value: usual.event.nfc.action.RF_FIELD_OFF_DETECTED
• Required subscriber permissions: ohos.permission.MANAGE_SECURE_SETTINGS

When the NFC RF field becomes unavailable, the event notification service is triggered to publish this event.