我想读在我transportaion DESFire非卡收费的平衡。这可能吗？怎么看？（在Android）

问题描述

我是新通过RFID和NFC和DESFire门禁卡。我已经从DESFire非标签读取UID。娄code给出了从defire标签U​​ID。

I am new by RFID and NFC and DESfire cards. I already read UID from desfire tag. Bellow code gives UID from defire tags.

UID是在文本3，但它只是第一个7个字节。

UID is in text3, but only first 7th byte from it.

 public void onNewIntent(Intent intent) {

            TextView text2 = (TextView) findViewById(R.id.textView2);
            TextView text1 = (TextView) findViewById(R.id.textView1);
            TextView text3 = (TextView) findViewById(R.id.textView3);

            String action = intent.getAction();

            if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)
                    || NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)
                    || NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {

                Toast.makeText(this, "discovered", Toast.LENGTH_SHORT).show();

            } else {
                Toast.makeText(this, "Falied", Toast.LENGTH_SHORT).show();
            }

            byte[] tagResponse = null;
            byte[] tagResponse1 = null;
            byte[] tagResponse2 = null;

           Tag desfire = (Tag) intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);

            isodep = IsoDep.get(desfire);

            try {
                isodep.connect();

            } catch (IOException e) {

                e.printStackTrace();

            }

           //byte[] test = new byte[] { (byte) 0xAA, (byte) 0x00 };
           byte[] test=new byte[]{(byte)0x60};
           byte[] test1=new byte[]{(byte)(0xAF)};
         //  byte[] test2=new byte[]{(byte)(90AF000000)};


            try {

                tagResponse = isodep.transceive(test);
                tagResponse1 = isodep.transceive(test1);
                tagResponse2 = isodep.transceive(test1);

                text1.setText(bytesToHex(tagResponse));
                text2.setText(bytesToHex(tagResponse1));
                text3.setText(bytesToHex(tagResponse2));

            } catch (IOException e) {

                e.printStackTrace();

            }
            try {
                isodep.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

我的测试，我手里唯一可用的标签是一个交通卡。我现在想读的电荷平衡在我transportaion卡。这可能吗？（我有支持NFC平板电脑）。如果有可能，我怎么也得做？请给我一些问候或code例子。我很新通过的DESFire阅读和写作。

The only tag available in my hand for my tests is a transportation card. I now want read balance of charge inside my transportaion card. is it possible?( I have a tablet which supports nfc.) If it is possible how i must do it?please give me some regards or code example. I am very new by DESFire reading and writing.

推荐答案

它通常是无法读取的平衡出了交通卡，因为它保存在一个上锁卡部门。您需要知道用于能够读取（以及可能改变）的信息的扇区的密钥和数目

It is usually not possible to read the balance out of transportation cards as it is saved in a locked card sector.You would need to know the key and number of the sector used to be able to read (and possibly alter) the information.

您可以尝试使用的https：/ /play.google.com/store/apps/details?id=at.mroland.android.apps.nfctaginfo 以识别扇区。但是如果没有密钥，您无法读取存储的数据。

You may try to use https://play.google.com/store/apps/details?id=at.mroland.android.apps.nfctaginfo to identify the sector. However without the key, you cannot read the stored data.

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