我正在尝试将一个简单的“Hello World”字符串写入 Mifare 1K 标签上扇区 0 的第一个块。该标签是全新的,具有默认配置。扇区尾部(块 3)在读取时为:00 00 00 00 00 00 00 00 ff 07 80 69 ff ff ff ff ff ff ff ff
. 因此,访问条件是ff 07 80 69
,这意味着我可以使用密钥 A 对每个块进行读写。
尽管如此,我还是无法在标签上写任何东西。这是我的代码:
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);
}
我收到以下异常:Transceived failed
.
我究竟做错了什么?
这是堆栈跟踪:
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)