MifareClassicTag

java.lang.Object
- ohos.nfc.tag.TagManager
- - ohos.nfc.tag.MifareClassicTag

```
public class MifareClassicTag
extends TagManager
```
Provides interfaces to create MifareClassic tags and obtain the tag information.
This class inherits from TagManager and provides interfaces to create MifareClassic tags and obtain the block and sector information of the MifareClassic tags.

从以下版本开始:

3

SystemCapability

SystemCapability.Communication.NFC

字段概要

字段
限定符和类型	字段	说明
`static int`	`BLOCK_BYTES`	Indicates the size of each block of the `MifareClassic` tag in bytes.
`static int`	`MIFARE_CLASSIC`	Indicates the Mifare classic tag.
`static int`	`MIFARE_PLUS`	Indicates the Mifare Plus tag.
`static int`	`MIFARE_PRO`	Indicates the Mifare Pro tag.
`static int`	`MIFARE_UNKNOWN`	Indicates the Mifare tag of an unknown type.
`static int`	`TAG_ROM_1K`	Indicates a `MifareClassic` tag with 16 sectors, each having 4 blocks.
`static int`	`TAG_ROM_2K`	Indicates a `MifareClassic` tag with 32 sectors, each having 4 blocks.
`static int`	`TAG_ROM_4K`	Indicates a `MifareClassic` tag with 40 sectors, with the first 32 sectors each having 4 blocks and the remaining 8 sectors each having 16 blocks.
`static int`	`TAG_ROM_MINI`	Indicates a `MifareClassic` tag with 5 sectors, each having 4 blocks.
`static byte`	`USE_KEY_A`	Indicates the Mifare authentication key of type A.
`static byte`	`USE_KEY_B`	Indicates the Mifare authentication key of type B.

从类继承的字段 ohos.nfc.tag.TagManager
ISO_DEP, MIFARE_ULTRALIGHT, NDEF, NFC_A, NFC_B, NFC_F, NFC_V

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法	说明
`boolean`	`authenSectorUseKey(int sectorId, byte[] key, byte keyType)`	Authenticates a specified sector of this `MifareClassic` tag with a key.
`void`	`decBlock(int blockId, int value)`	Deducts a value from the content of a specified block of this `MifareClassic` tag.
`int`	`getBlocksNum()`	Obtains the number of blocks of this `MifareClassic` tag.
`int`	`getBlocksNumForSector(int sectorId)`	Obtains the number of blocks in a specified sector of this `MifareClassic` tag.
`int`	`getFirstBlockId(int sectorId)`	Obtains the ID of the first block of a `MifareClassic` tag in a specified sector.
`static MifareClassicTag`	`getInstance(TagInfo tagInfo)`	Obtains a `MifareClassic` tag based on the given tag information.
`int`	`getMifareType()`	Obtains the Mifare type of this `MifareClassic` tag.
`int`	`getSectorId(int blockId)`	Obtains the sector ID of a Mifare Classic tag based on the block ID of the Mifare tag.
`int`	`getSectorsNum()`	Obtains the number of sectors of this `MifareClassic` tag base on the size of tag.
`int`	`getTagSize()`	Obtains the size of this `MifareClassic` tag.
`void`	`incBlock(int blockId, int value)`	Adds a value to the content of a specified block of this `MifareClassic` tag.
`byte[]`	`readBlock(int blockId)`	Reads content of a specified block of this `MifareClassic` tag based on the block id.
`void`	`restoreBlock(int blockId)`	Migrates the content of a specified block of this `MifareClassic` tag to an internal buffer.
`void`	`writeBlock(int blockId, byte[] data)`	Writes data to a specified block of this `MifareClassic` tag.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从类继承的方法 ohos.nfc.tag.TagManager
checkConnected, connectTag, getMaxSendLength, getSendDataTimeout, getTagInfo, isTagConnected, reset, sendData, setSendDataTimeout

- 字段详细资料
  - BLOCK_BYTES
```
public static final int BLOCK_BYTES
```
    Indicates the size of each block of the MifareClassic tag in bytes.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
  - MIFARE_CLASSIC
```
public static final int MIFARE_CLASSIC
```
    Indicates the Mifare classic tag.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
  - MIFARE_PLUS
```
public static final int MIFARE_PLUS
```
    Indicates the Mifare Plus tag.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
  - MIFARE_PRO
```
public static final int MIFARE_PRO
```
    Indicates the Mifare Pro tag.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
  - MIFARE_UNKNOWN
```
public static final int MIFARE_UNKNOWN
```
    Indicates the Mifare tag of an unknown type.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
  - TAG_ROM_1K
```
public static final int TAG_ROM_1K
```
    Indicates a MifareClassic tag with 16 sectors, each having 4 blocks.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
  - TAG_ROM_2K
```
public static final int TAG_ROM_2K
```
    Indicates a MifareClassic tag with 32 sectors, each having 4 blocks.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
  - TAG_ROM_4K
```
public static final int TAG_ROM_4K
```
    Indicates a MifareClassic tag with 40 sectors, with the first 32 sectors each having 4 blocks and the remaining 8 sectors each having 16 blocks.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
  - TAG_ROM_MINI
```
public static final int TAG_ROM_MINI
```
    Indicates a MifareClassic tag with 5 sectors, each having 4 blocks.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
  - USE_KEY_A
```
public static final byte USE_KEY_A
```
    Indicates the Mifare authentication key of type A.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
  - USE_KEY_B
```
public static final byte USE_KEY_B
```
    Indicates the Mifare authentication key of type B.
    
    从以下版本开始:
    
    3
    
    另请参阅:
    
    常量字段值
- 方法详细资料
  - getInstance
```
public static MifareClassicTag getInstance(TagInfo tagInfo)
```
    Obtains a MifareClassic tag based on the given tag information.
    During tag reading, if the tag supports the NFC-A technology, a MifareClassic object will be created based on the given tag information.
    
    参数:
    
    tagInfo - Indicates the given tag information.
    
    返回:
    
    Returns the MifareClassic tag.
    
    从以下版本开始:
    
    3
  - getMifareType
```
public int getMifareType()
```
    Obtains the Mifare type of this MifareClassic tag.
    
    返回:
    
    Returns the Mifare type of this MifareClassic tag, such as MIFARE_CLASSIC and MIFARE_PLUS.
    
    从以下版本开始:
    
    3
  - getTagSize
```
public int getTagSize()
```
    Obtains the size of this MifareClassic tag.
    
    返回:
    
    Returns the size of this MifareClassic tag, such as TAG_ROM_1K and TAG_ROM_2K.
    
    从以下版本开始:
    
    3
  - getSectorsNum
```
public int getSectorsNum()
```
    Obtains the number of sectors of this MifareClassic tag base on the size of tag.
    
    返回:
    
    Returns the number of sectors of this MifareClassic tag. For example, a MifareClassic tag that is TAG_ROM_1K in size has 16 sectors.
    
    从以下版本开始:
    
    3
  - getBlocksNum
```
public int getBlocksNum()
```
    Obtains the number of blocks of this MifareClassic tag.
    
    返回:
    
    Returns the number of blocks of this MifareClassic tag.
    
    从以下版本开始:
    
    3
  - getBlocksNumForSector
```
public int getBlocksNumForSector(int sectorId)
```
    Obtains the number of blocks in a specified sector of this MifareClassic tag.
    
    参数:
    
    sectorId - Indicates the ID of the specified sector.
    
    返回:
    
    Returns the number of blocks in the specified sector of this MifareClassic tag.
    
    从以下版本开始:
    
    3
  - getSectorId
```
public int getSectorId(int blockId)
```
    Obtains the sector ID of a Mifare Classic tag based on the block ID of the Mifare tag.
    
    参数:
    
    blockId - Indicates the block ID.
    
    返回:
    
    Returns the sector ID.
    
    从以下版本开始:
    
    3
  - getFirstBlockId
```
public int getFirstBlockId(int sectorId)
```
    Obtains the ID of the first block of a MifareClassic tag in a specified sector.
    
    参数:
    
    sectorId - Indicates the ID of the specified sector.
    
    返回:
    
    Returns the ID of the first block in the specified sector.
    
    从以下版本开始:
    
    3
  - authenSectorUseKey
```
public boolean authenSectorUseKey(int sectorId,
                                  byte[] key,
                                  byte keyType)
```
    Authenticates a specified sector of this MifareClassic tag with a key.
    
    参数:
    
    sectorId - Indicates the ID of the specified sector.
    
    key - Indicates the key in bit array format.
    
    keyType - Indicates the key type, such as USE_KEY_A and USE_KEY_B.
    
    返回:
    
    Returns true if the authentication succeeds; returns false otherwise.
    
    从以下版本开始:
    
    3
  - readBlock
```
public byte[] readBlock(int blockId)
```
    Reads content of a specified block of this MifareClassic tag based on the block id.
    
    参数:
    
    blockId - Indicates the ID of the block to read.
    
    返回:
    
    Returns the specified block content of this MifareClassic tag.
    
    从以下版本开始:
    
    3
  - writeBlock
```
public void writeBlock(int blockId,
                       byte[] data)
```
    Writes data to a specified block of this MifareClassic tag.
    
    参数:
    
    blockId - Indicates the ID of the specified block to which the data will be written.
    
    data - Indicates the data to write to the specified block.
    
    从以下版本开始:
    
    3
  - incBlock
```
public void incBlock(int blockId,
                     int value)
```
    Adds a value to the content of a specified block of this MifareClassic tag.
    
    参数:
    
    blockId - Indicates the ID of block to increment.
    
    value - Indicates the non-negative value to increment.
    
    从以下版本开始:
    
    3
  - decBlock
```
public void decBlock(int blockId,
                     int value)
```
    Deducts a value from the content of a specified block of this MifareClassic tag.
    
    参数:
    
    blockId - Indicates the ID of block to decrement.
    
    value - Indicates the non-negative value to decrement.
    
    从以下版本开始:
    
    3
  - restoreBlock
```
public void restoreBlock(int blockId)
```
    Migrates the content of a specified block of this MifareClassic tag to an internal buffer.
    
    参数:
    
    blockId - Indicates the ID of the specified value block.
    
    从以下版本开始:
    
    3

类 MifareClassicTag

字段概要

从类继承的字段 ohos.nfc.tag.TagManager

方法概要

从类继承的方法 java.lang.Object

从类继承的方法 ohos.nfc.tag.TagManager

字段详细资料

BLOCK_BYTES

MIFARE_CLASSIC

MIFARE_PLUS

MIFARE_PRO

MIFARE_UNKNOWN

TAG_ROM_1K

TAG_ROM_2K

TAG_ROM_4K

TAG_ROM_MINI

USE_KEY_A

USE_KEY_B

方法详细资料

getInstance

getMifareType

getTagSize

getSectorsNum

getBlocksNum

getBlocksNumForSector

getSectorId

getFirstBlockId

authenSectorUseKey

readBlock

writeBlock

incBlock

decBlock

restoreBlock