如果有人通过快速设置菜单打开NFC，如何通知应用程序？

<intent-filter>
    <action android:name="android.nfc.action.ADAPTER_STATE_CHANGED" />
</intent-filter>

@Override
public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    if (NfcAdapter.ACTION_ADAPTER_STATE_CHANGED.equals(action)) {
        int state = intent.getIntExtra(NfcAdapter.EXTRA_ADAPTER_STATE, NfcAdapter.STATE_OFF);
        if (state == NfcAdapter.STATE_ON) {
            // NFC已打开，执行相应操作
        } else if (state == NfcAdapter.STATE_OFF) {
            // NFC已关闭，执行相应操作
        }
    }
}

<uses-permission android:name="android.permission.NFC" />