Hallo,

Android provides an API for access to MIFARE Classic cards:
http://developer.android.com/reference/android/nfc/tech/MifareClassic.html

Use the readBlock, writeBlock, increment, decrement, transfer and
restore methods to operate on value blocks.

For more information on MIFARE commands and the format of data blocks
see NXP's data sheet:
http://www.nxp.com/documents/data_sheet/MF1S503x.pdf

Be careful that you have the correct permissions to use blocks as
value blocks.

br
Michael

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