Writing to a Mifare tag with Android NFC?
Solution 1
You are trying to write to block 0, which is not possible. Block 0 is always read-only, even of the access conditions say that it is writeable. Block 0 contais the UID and some other manufacturer data. Try writing to block 1 or 2 instead and see whether you still have the same problem.
Solution 2
I've seen that particular exception when trying to read from a Tag that isn't connected to the reader any more.
I know that for some card/reader combinations it is difficult to maintain a decent connection.
For example my Nexus S has trouble maintaining a connection with some tags. The Nexus S doesn't have the strongest field. I think the Galaxy Note is similar in that respect.
Try some other brands of tags as well as other readers.
Also, I'd try running your read through a for loop to see if it maintains a connection, if that makes sense.
![Michael Eilers Smith](https://i.stack.imgur.com/wtyup.jpg?s=256&g=1)
Michael Eilers Smith
Updated on June 17, 2022Comments
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Michael Eilers Smith about 2 years
I'm trying to write a simple "Hello World" string to the first block of sector 0 on a Mifare 1K tag. The tag is brand new with default configuration. The sector trailer (block 3), when read, is:
00 00 00 00 00 00 00 00 ff 07 80 69 ff ff ff ff ff ff ff ff
. Hence, the access conditions isff 07 80 69
, meaning I can read and write on each block with key A.Still, I can't manage to write anything on the tag. Here's my code:
try { mfc.connect(); boolean auth = false; auth = mfc.authenticateSectorWithKeyA(0,MifareClassic.KEY_DEFAULT); if (auth) { String text = "Hello, World!"; byte[] value = text.getBytes(); byte[] toWrite = new byte[MifareClassic.BLOCK_SIZE]; for (int i=0; i<MifareClassic.BLOCK_SIZE; i++) { if (i < value.length) toWrite[i] = value[i]; else toWrite[i] = 0; } mfc.writeBlock(0, toWrite); }
I'm getting the following exception:
Transceived failed
.What am I doing wrong?
Here's the stack trace:
07-09 00:19:44.836: W/System.err(13167): at android.nfc.TransceiveResult.getResponseOrThrow(TransceiveResult.java:52) 07-09 00:19:44.843: W/System.err(13167): at android.nfc.tech.BasicTagTechnology.transceive(BasicTagTechnology.java:151) 07-09 00:19:44.843: W/System.err(13167): at android.nfc.tech.MifareClassic.writeBlock(MifareClassic.java:453) 07-09 00:19:44.843: W/System.err(13167): at com.example.andorid.apis.mifare.MainActivity.resolveIntent(MainActivity.java:128) 07-09 00:19:44.843: W/System.err(13167): at com.example.andorid.apis.mifare.MainActivity.onNewIntent(MainActivity.java:275) 07-09 00:19:44.843: W/System.err(13167): at android.app.Instrumentation.callActivityOnNewIntent(Instrumentation.java:1123) 07-09 00:19:44.843: W/System.err(13167): at android.app.ActivityThread.deliverNewIntents(ActivityThread.java:2041) 07-09 00:19:44.843: W/System.err(13167): at android.app.ActivityThread.performNewIntents(ActivityThread.java:2054) 07-09 00:19:44.843: W/System.err(13167): at android.app.ActivityThread.handleNewIntent(ActivityThread.java:2063) 07-09 00:19:44.843: W/System.err(13167): at android.app.ActivityThread.access$1400(ActivityThread.java:122) 07-09 00:19:44.843: W/System.err(13167): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1193) 07-09 00:19:44.851: W/System.err(13167): at android.os.Handler.dispatchMessage(Handler.java:99) 07-09 00:19:44.851: W/System.err(13167): at android.os.Looper.loop(Looper.java:137) 07-09 00:19:44.851: W/System.err(13167): at android.app.ActivityThread.main(ActivityThread.java:4340) 07-09 00:19:44.851: W/System.err(13167): at java.lang.reflect.Method.invokeNative(Native Method) 07-09 00:19:44.851: W/System.err(13167): at java.lang.reflect.Method.invoke(Method.java:511) 07-09 00:19:44.851: W/System.err(13167): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 07-09 00:19:44.851: W/System.err(13167): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 07-09 00:19:44.851: W/System.err(13167): at dalvik.system.NativeStart.main(Native Method)