程序包 ohos.nfc.tag

类 MessageRecord

java.lang.Object

ohos.nfc.tag.MessageRecord

所有已实现的接口:

Sequenceable

public class MessageRecord
extends Object
implements Sequenceable

Represents an NDEF record.

MessageRecord is the metadata of NdefMessage. An NdefMessage instance consists of one or more MessageRecord.

从以下版本开始:

3

SystemCapability

SystemCapability.Communication.NFC

嵌套类概要

从接口继承的嵌套类/接口 ohos.utils.Sequenceable

Sequenceable.Producer<T>

构造器概要

构造器

构造器	说明
MessageRecord(short tnf, byte[] type, byte[] id, byte[] payload)	Constructs an NDEF record with specified parameters.

方法概要

限定符和类型	方法	说明
static MessageRecord	buildApplicationRecord(String packageName)	Creates an NDEF record for an OHOS application.
static MessageRecord	buildExternal(String domain, String type, byte[] data)	Creates an NDEF record containing external data.
static MessageRecord	buildMime(String mimeType, byte[] mimeData)	Creates an NDEF record containing MIME data.
static MessageRecord	buildTextRecord(String languageCode, String text)	Creates an NDEF record containing text data.
Optional<Uri>	buildUri()	Builds a URI from this NDEF record.
boolean	equals(Object obj)	Check whethers two objects are equal.
byte[]	getId()	Obtains the ID of the NDEF record.
byte[]	getPayload()	Obtains the payload of the NDEF record.
short	getTnf()	Obtains the TNF of the NDEF record.
byte[]	getType()	Obtains the payload type of the NDEF record.
int	hashCode()	Gets the hash code of the object.
boolean	marshalling(Parcel out)	Marshals this Sequenceable object into a Parcel.
boolean	unmarshalling(Parcel in)	Unmarshals this Sequenceable object from a Parcel.

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 ohos.utils.Sequenceable

hasFileDescriptor

构造器详细资料

MessageRecord

public MessageRecord(short tnf,
                     byte[] type,
                     byte[] id,
                     byte[] payload)

Constructs an NDEF record with specified parameters.

参数:

tnf - Indicates the TNF of the NDEF record.

type - Indicates the payload type of the NDEF record.

id - Indicates the ID of the NDEF record, which is used for referencing between NDEF records.

payload - Indicates the payload, which contains user data.

从以下版本开始:

3

方法详细资料

getTnf

public short getTnf()

Obtains the TNF of the NDEF record.

返回:

Returns the TNF of the NDEF record.

从以下版本开始:

3

getType

public byte[] getType()

Obtains the payload type of the NDEF record.

返回:

Returns the payload type of the NDEF record.

从以下版本开始:

3

getId

public byte[] getId()

Obtains the ID of the NDEF record.

返回:

Returns the ID of the NDEF record.

从以下版本开始:

3

getPayload

public byte[] getPayload()

Obtains the payload of the NDEF record.

返回:

Returns the payload of the NDEF record.

从以下版本开始:

3

hashCode

public int hashCode()

Gets the hash code of the object.

覆盖:

hashCode 在类中 Object

返回:

Returns the hashcode.

从以下版本开始:

3

另请参阅:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

equals

public boolean equals(Object obj)

Check whethers two objects are equal.

覆盖:

equals 在类中 Object

参数:

obj - the reference object with which to compare.

返回:

Returns true if two objects are equal; returns false otherwise.

从以下版本开始:

3

另请参阅:

Object.hashCode(), HashMap

buildApplicationRecord

public static MessageRecord buildApplicationRecord(String packageName)

Creates an NDEF record for an OHOS application.

参数:

packageName - Indicates the package name of the application.

返回:

Returns the created NDEF record.

抛出:

IllegalArgumentException - if the package name is empty.

从以下版本开始:

3

buildMime

public static MessageRecord buildMime(String mimeType,
                                      byte[] mimeData)

Creates an NDEF record containing MIME data.

参数:

mimeType - Indicates the MIME type.

mimeData - Indicates the MIME data.

返回:

Returns the NDEF record containing MIME data.

抛出:

IllegalArgumentException - if the mimeType is empty or invalid.

从以下版本开始:

3

buildExternal

public static MessageRecord buildExternal(String domain,
                                          String type,
                                          byte[] data)

Creates an NDEF record containing external data.

参数:

domain - Indicates the domain name of the data issuing organization.

type - Indicates the data type.

data - Indicates the external data.

返回:

Returns the NDEF record containing external data.

抛出:

IllegalArgumentException - if either domain or type are empty or invalid.

从以下版本开始:

3

buildTextRecord

public static MessageRecord buildTextRecord(String languageCode,
                                            String text)

Creates an NDEF record containing text data.

参数:

languageCode - Indicates the language code.

text - Indicates the text.

返回:

Returns the NDEF record containing text data.

抛出:

IllegalArgumentException - if the languageCode is empty or invalid.

从以下版本开始:

3

buildUri

public Optional<Uri> buildUri()

Builds a URI from this NDEF record.

返回:

Returns a URI in lowercase if the buding is successful; returns null if it is not a URI record.

从以下版本开始:

4

marshalling

public boolean marshalling(Parcel out)

从接口复制的说明: Sequenceable

Marshals this Sequenceable object into a Parcel.

指定者:

marshalling 在接口中 Sequenceable

参数:

out - Indicates the Parcel object to which the Sequenceable object will be marshaled..

返回:

Returns true if the marshalling is successful; returns false otherwise.

unmarshalling

public boolean unmarshalling(Parcel in)

从接口复制的说明: Sequenceable

Unmarshals this Sequenceable object from a Parcel.

指定者:

unmarshalling 在接口中 Sequenceable

参数:

in - Indicates the Parcel object into which the Sequenceable object has been marshaled.

返回:

Returns true if the unmarshalling is successful; returns false otherwise.