如何在我的 android NFC 应用程序中显示十六进制唯一 ID NFC 标签？
How to show Hexadecimal unique ID NFC Tag have in my android NFC application?
我已经制作了一个可以正常工作的写入标签应用程序，我将数据文本存储到 NFC 标签中的标签对象（例如：计算机 1）。写入和读取工作正常。但是当我阅读信息文本时，我需要读取每个标签所具有的十六进制 ID，我知道它们具有唯一的十六进制 ID（因为我在使用 google play 应用程序对其进行测试时看到了那个）。但我不知道该怎么做。我真的很不擅长编码，所以请帮助我。
这是代码：
public class MainActivity extends Activity {
NfcAdapter mAdapter;
Tag mTag;
PendingIntent mPI;
IntentFilter mFilter[];
String userData,yo;
boolean writeMode;
Context context;
TextView tvNFCContent, Timer,Low;
Button start, pause, reset, lap ;
long MillisecondTime, StartTime, TimeBuff, UpdateTime = 0L ;
Handler handler;
int Seconds, Minutes, MilliSeconds ;
ListView listView ;
String[] ListElements = new String[] { };
List<String> ListElementsArrayList ;
ArrayAdapter<String> adapter ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvNFCContent = (TextView) findViewById(R.id.data);
Timer = (TextView)findViewById(R.id.timer);
tvNFCContent.addTextChangedListener(watch);
handler = new Handler() ;
mAdapter = NfcAdapter.getDefaultAdapter(this);
mPI = PendingIntent.getActivity(getApplicationContext(), 0,
new Intent(this,getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP),0 );
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
IntentFilter filter2 = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
mFilter = new IntentFilter[]{tagDetected,filter2};
mAdapter = NfcAdapter.getDefaultAdapter(this);
if (mAdapter == null) {
// Stop here, we definitely need NFC
Toast.makeText(this, "This device doesn't support NFC.", Toast.LENGTH_LONG).show();
finish();
}
readFromIntent(getIntent());
}
private void readFromIntent(Intent intent) {
String action = intent.getAction();
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action))
{
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage[] msgs = null;
if (rawMsgs != null) {
msgs = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) {
msgs[i] = (NdefMessage) rawMsgs[i];
}
}
buildTagViews(msgs);
}
}
private void buildTagViews(NdefMessage[] msgs) {
if (msgs == null || msgs.length == 0) return;
String text = "";
// String tagId = new String(msgs[0].getRecords()[0].getType());
byte[] payload = msgs[0].getRecords()[0].getPayload();
String textEncoding = ((payload[0] & 128) == 0) ? "UTF-8" : "UTF-16"; // Get the Text Encoding
int languageCodeLength = payload[0] & 0063; // Get the Language Code, e.g. "en"
// String languageCode = new String(payload, 1, languageCodeLength, "US-ASCII");
try {
text = new String(payload, languageCodeLength + 1, payload.length - languageCodeLength - 1, textEncoding);
} catch (UnsupportedEncodingException e) {
Log.e("UnsupportedEncoding", e.toString());
}
tvNFCContent.setText("NFC Content: " + text);
TimeBuff += MillisecondTime;
handler.removeCallbacks(runnable);
}
NdefMessage[] getNdefMessage(Intent intent)
{
NdefMessage[] msgs = null;
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
if(rawMsgs != null)
{
msgs = new NdefMessage[rawMsgs.length];
for(int i=0; i<rawMsgs.length; i++)
{
msgs[i] = (NdefMessage)rawMsgs[i];
}
}
return msgs;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onNewIntent(Intent intent) {
// TODO Auto-generated method stub
setIntent(intent);
readFromIntent(intent);
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())){
mTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
}
super.onNewIntent(intent);
if(intent.getAction().equals(NfcAdapter.ACTION_NDEF_DISCOVERED))
{
Toast.makeText(getApplicationContext(),"Ndefdiscovered",Toast.LENGTH_SHORT).show();
}else if(intent.getAction().equals(NfcAdapter.ACTION_TAG_DISCOVERED))
{
mTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
Toast.makeText(getApplicationContext(),"Smartcard detected",Toast.LENGTH_SHORT).show();
StartTime = SystemClock.uptimeMillis();
handler.postDelayed(runnable, 0);
NdefMessage[] messages = getNdefMessage(intent);
if(messages == null)
{
Toast.makeText(getApplicationContext(),"There Is No Data",Toast.LENGTH_SHORT).show();
return;
}
byte[] payload = messages[0].getRecords()[0].getPayload();
userData = new String(payload);
} else {
Toast.makeText(getApplicationContext(),"Undefined smartcard",Toast.LENGTH_SHORT).show();
}
}
public Runnable runnable = new Runnable() {
public void run() {
MillisecondTime = SystemClock.uptimeMillis() - StartTime;
UpdateTime = TimeBuff + MillisecondTime;
Seconds = (int) (UpdateTime / 1000);
Minutes = Seconds / 60;
Seconds = Seconds % 60;
MilliSeconds = (int) (UpdateTime % 1000);
Timer.setText("" + Minutes + ":"
+ String.format("%02d", Seconds) + ":"
+ String.format("%03d", MilliSeconds));
handler.postDelayed(this, 0);
}
};
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
mAdapter.disableForegroundDispatch(this);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
mAdapter.enableForegroundDispatch(this, mPI, mFilter, null);
}
TextWatcher watch = new TextWatcher(){
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence s, int a, int b, int c) {
// TODO Auto-generated method stub
}
};
}
对不起，我上传了整个代码，我只是想让任何愿意帮助我的人都能轻松上手。
在 onNewIntent() 中添加这段代码
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
byte[] uid = tag.getId(); //This is the Unique IDentifier of the card
使用以下方法获取十六进制值
public static String getHexValue(final byte[] buffer) {
if (buffer == null || buffer.length == 0) {
return ("0x" + "[none]");
}
final StringBuffer sb = new StringBuffer();
sb.append("0x");
for (int i = 0; i < buffer.length - 1; i++) {
sb.append(String.format("%02X%s", buffer[i], ""));
}
sb.append(String.format("%02X", buffer[buffer.length - 1]));
return sb.toString();
}
我终于来了。感谢所有帮助过我的人。这是我与您分享的完整代码。
package com.nfcreadfull;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.util.List;
import android.nfc.FormatException;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
import android.os.Bundle;
import android.os.Handler;
import android.os.Parcelable;
import android.os.SystemClock;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
NfcAdapter mAdapter;
Tag mTag;
PendingIntent mPI;
IntentFilter mFilter[];
String userData,yo;
boolean writeMode;
Context context;
TextView tvNFCContent, Timer,Low, Uid;
Button start, pause, reset, lap ;
long MillisecondTime, StartTime, TimeBuff, UpdateTime = 0L ;
int Seconds, Minutes, MilliSeconds ;
ListView listView ;
String[] ListElements = new String[] { };
List<String> ListElementsArrayList ;
ArrayAdapter<String> adapter ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvNFCContent = (TextView) findViewById(R.id.data);
Timer = (TextView)findViewById(R.id.timer);
Uid = (TextView)findViewById(R.id.uid);
mAdapter = NfcAdapter.getDefaultAdapter(this);
mPI = PendingIntent.getActivity(getApplicationContext(), 0,
new Intent(this,getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP),0 );
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
IntentFilter filter2 = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
mFilter = new IntentFilter[]{tagDetected,filter2};
mAdapter = NfcAdapter.getDefaultAdapter(this);
if (mAdapter == null) {
// Stop here, we definitely need NFC
Toast.makeText(this, "This device doesn't support NFC.", Toast.LENGTH_LONG).show();
finish();
}
readFromIntent(getIntent());
}
private void readFromIntent(Intent intent) {
String action = intent.getAction();
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action))
{
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage[] msgs = null;
if (rawMsgs != null) {
msgs = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) {
msgs[i] = (NdefMessage) rawMsgs[i];
}
}
buildTagViews(msgs);
}
}
private void buildTagViews(NdefMessage[] msgs) {
if (msgs == null || msgs.length == 0) return;
String text = "";
// String tagId = new String(msgs[0].getRecords()[0].getType());
byte[] payload = msgs[0].getRecords()[0].getPayload();
String textEncoding = ((payload[0] & 128) == 0) ? "UTF-8" : "UTF-16"; // Get the Text Encoding
int languageCodeLength = payload[0] & 0063; // Get the Language Code, e.g. "en"
// String languageCode = new String(payload, 1, languageCodeLength, "US-ASCII");
try {
text = new String(payload, languageCodeLength + 1, payload.length - languageCodeLength - 1, textEncoding);
} catch (UnsupportedEncodingException e) {
Log.e("UnsupportedEncoding", e.toString());
}
tvNFCContent.setText("NFC Content: " + text);
}
NdefMessage[] getNdefMessage(Intent intent)
{
NdefMessage[] msgs = null;
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
if(rawMsgs != null)
{
msgs = new NdefMessage[rawMsgs.length];
for(int i=0; i<rawMsgs.length; i++)
{
msgs[i] = (NdefMessage)rawMsgs[i];
}
}
return msgs;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onNewIntent(Intent intent) {
// TODO Auto-generated method stub
Uid.setText(ByteArrayToHexString(intent.getByteArrayExtra(NfcAdapter.EXTRA_ID)));
setIntent(intent);
readFromIntent(intent);
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())){
mTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
}
super.onNewIntent(intent);
if(intent.getAction().equals(NfcAdapter.ACTION_NDEF_DISCOVERED))
{
Toast.makeText(getApplicationContext(),"Smartcard detected",Toast.LENGTH_SHORT).show();
}else if(intent.getAction().equals(NfcAdapter.ACTION_TAG_DISCOVERED))
{
mTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
NdefMessage[] messages = getNdefMessage(intent);
if(messages == null)
{
Toast.makeText(getApplicationContext(),"There Is No Data",Toast.LENGTH_SHORT).show();
return;
}
byte[] payload = messages[0].getRecords()[0].getPayload();
userData = new String(payload);
}else
{
Toast.makeText(getApplicationContext(),"Undefined smartcard",Toast.LENGTH_SHORT).show();
}
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) {
// While with ForegroundDispatch the NDEF message has already been read
// And passed to us in the intent and thus the time the App spends "read" the NFC card is Zero
// We want to time time the read, so now we have been notified that a NDEF card is in range
// Try and read from it
// Get the Tag from the intent
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
long startTime = 0;
long endTime = 0;
try {
// Create an NDEF tag object
Ndef ndefTag = Ndef.get(tag);
// This is the I/O operation to read the card and format the result to an NDEF message
// Nothing is done with the result to not add any time to it, as we are timing this
startTime = System.currentTimeMillis();
ndefTag.connect();
ndefTag.getNdefMessage();
endTime = System.currentTimeMillis();
ndefTag.close();
} catch (Exception e) {
Log.e("NFC", e.toString());
}
MillisecondTime = endTime - startTime;
UpdateTime = MillisecondTime;
Seconds = (int) (UpdateTime / 1000);
Minutes = Seconds / 60;
Seconds = Seconds % 60;
MilliSeconds = (int) (UpdateTime % 1000);
Timer.setText("" + Minutes + ":"
+ String.format("%02d", Seconds) + "."
+ String.format("%03d", MilliSeconds));
//Log.v("NFC", "Time to read in milliseconds is: " + (endTime - startTime));
//Timer.setText("00:00:0.0"+(endTime - startTime));
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
mAdapter.disableForegroundDispatch(this);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
IntentFilter ndefDetected = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
try {
ndefDetected.addDataType("*/*");
} catch (IntentFilter.MalformedMimeTypeException e) {}
IntentFilter techDetected = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
IntentFilter[] nfcIntentFilter = new IntentFilter[]{ndefDetected,techDetected,tagDetected};
PendingIntent pendingIntent = PendingIntent.getActivity(
this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
if(mAdapter!= null)
mAdapter.enableForegroundDispatch(this, pendingIntent, nfcIntentFilter, null);
}
private String getHex(byte[] bytes) {
if (bytes == null) {
return null;
}
char[] hexChars = new char[bytes.length * 2];
final char[] hexArray = "0123456789abcdef".toCharArray();
for (int j = 0; j < bytes.length; j++) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
private long getDec(byte[] bytes) {
long result = 0;
long factor = 1;
for (int i = 0; i < bytes.length; ++i) {
long value = bytes[i] & 0xffl;
result += value * factor;
factor *= 256l;
}
return result;
}
private String ByteArrayToHexString(byte [] inarray) {
Log.d("ByteArrayToHexString", inarray.toString());
int i, j, in;
String [] hex = {"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"};
String out= "";
for(j = 0 ; j < inarray.length ; ++j)
{
in = (int) inarray[j] & 0xff;
i = (in >> 4) & 0x0f;
out += hex[i];
i = in & 0x0f;
out += hex[i];
}
Log.d("ByteArrayToHexString", String.format("%0" + (inarray.length * 2) + "X", new BigInteger(1,inarray)));
return out;
}
}
我已经制作了一个可以正常工作的写入标签应用程序，我将数据文本存储到 NFC 标签中的标签对象（例如：计算机 1）。写入和读取工作正常。但是当我阅读信息文本时，我需要读取每个标签所具有的十六进制 ID，我知道它们具有唯一的十六进制 ID（因为我在使用 google play 应用程序对其进行测试时看到了那个）。但我不知道该怎么做。我真的很不擅长编码，所以请帮助我。
这是代码：
public class MainActivity extends Activity {
NfcAdapter mAdapter;
Tag mTag;
PendingIntent mPI;
IntentFilter mFilter[];
String userData,yo;
boolean writeMode;
Context context;
TextView tvNFCContent, Timer,Low;
Button start, pause, reset, lap ;
long MillisecondTime, StartTime, TimeBuff, UpdateTime = 0L ;
Handler handler;
int Seconds, Minutes, MilliSeconds ;
ListView listView ;
String[] ListElements = new String[] { };
List<String> ListElementsArrayList ;
ArrayAdapter<String> adapter ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvNFCContent = (TextView) findViewById(R.id.data);
Timer = (TextView)findViewById(R.id.timer);
tvNFCContent.addTextChangedListener(watch);
handler = new Handler() ;
mAdapter = NfcAdapter.getDefaultAdapter(this);
mPI = PendingIntent.getActivity(getApplicationContext(), 0,
new Intent(this,getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP),0 );
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
IntentFilter filter2 = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
mFilter = new IntentFilter[]{tagDetected,filter2};
mAdapter = NfcAdapter.getDefaultAdapter(this);
if (mAdapter == null) {
// Stop here, we definitely need NFC
Toast.makeText(this, "This device doesn't support NFC.", Toast.LENGTH_LONG).show();
finish();
}
readFromIntent(getIntent());
}
private void readFromIntent(Intent intent) {
String action = intent.getAction();
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action))
{
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage[] msgs = null;
if (rawMsgs != null) {
msgs = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) {
msgs[i] = (NdefMessage) rawMsgs[i];
}
}
buildTagViews(msgs);
}
}
private void buildTagViews(NdefMessage[] msgs) {
if (msgs == null || msgs.length == 0) return;
String text = "";
// String tagId = new String(msgs[0].getRecords()[0].getType());
byte[] payload = msgs[0].getRecords()[0].getPayload();
String textEncoding = ((payload[0] & 128) == 0) ? "UTF-8" : "UTF-16"; // Get the Text Encoding
int languageCodeLength = payload[0] & 0063; // Get the Language Code, e.g. "en"
// String languageCode = new String(payload, 1, languageCodeLength, "US-ASCII");
try {
text = new String(payload, languageCodeLength + 1, payload.length - languageCodeLength - 1, textEncoding);
} catch (UnsupportedEncodingException e) {
Log.e("UnsupportedEncoding", e.toString());
}
tvNFCContent.setText("NFC Content: " + text);
TimeBuff += MillisecondTime;
handler.removeCallbacks(runnable);
}
NdefMessage[] getNdefMessage(Intent intent)
{
NdefMessage[] msgs = null;
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
if(rawMsgs != null)
{
msgs = new NdefMessage[rawMsgs.length];
for(int i=0; i<rawMsgs.length; i++)
{
msgs[i] = (NdefMessage)rawMsgs[i];
}
}
return msgs;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onNewIntent(Intent intent) {
// TODO Auto-generated method stub
setIntent(intent);
readFromIntent(intent);
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())){
mTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
}
super.onNewIntent(intent);
if(intent.getAction().equals(NfcAdapter.ACTION_NDEF_DISCOVERED))
{
Toast.makeText(getApplicationContext(),"Ndefdiscovered",Toast.LENGTH_SHORT).show();
}else if(intent.getAction().equals(NfcAdapter.ACTION_TAG_DISCOVERED))
{
mTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
Toast.makeText(getApplicationContext(),"Smartcard detected",Toast.LENGTH_SHORT).show();
StartTime = SystemClock.uptimeMillis();
handler.postDelayed(runnable, 0);
NdefMessage[] messages = getNdefMessage(intent);
if(messages == null)
{
Toast.makeText(getApplicationContext(),"There Is No Data",Toast.LENGTH_SHORT).show();
return;
}
byte[] payload = messages[0].getRecords()[0].getPayload();
userData = new String(payload);
} else {
Toast.makeText(getApplicationContext(),"Undefined smartcard",Toast.LENGTH_SHORT).show();
}
}
public Runnable runnable = new Runnable() {
public void run() {
MillisecondTime = SystemClock.uptimeMillis() - StartTime;
UpdateTime = TimeBuff + MillisecondTime;
Seconds = (int) (UpdateTime / 1000);
Minutes = Seconds / 60;
Seconds = Seconds % 60;
MilliSeconds = (int) (UpdateTime % 1000);
Timer.setText("" + Minutes + ":"
+ String.format("%02d", Seconds) + ":"
+ String.format("%03d", MilliSeconds));
handler.postDelayed(this, 0);
}
};
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
mAdapter.disableForegroundDispatch(this);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
mAdapter.enableForegroundDispatch(this, mPI, mFilter, null);
}
TextWatcher watch = new TextWatcher(){
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence s, int a, int b, int c) {
// TODO Auto-generated method stub
}
};
}
对不起，我上传了整个代码，我只是想让任何愿意帮助我的人都能轻松上手。
在 onNewIntent() 中添加这段代码
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
byte[] uid = tag.getId(); //This is the Unique IDentifier of the card
使用以下方法获取十六进制值
public static String getHexValue(final byte[] buffer) {
if (buffer == null || buffer.length == 0) {
return ("0x" + "[none]");
}
final StringBuffer sb = new StringBuffer();
sb.append("0x");
for (int i = 0; i < buffer.length - 1; i++) {
sb.append(String.format("%02X%s", buffer[i], ""));
}
sb.append(String.format("%02X", buffer[buffer.length - 1]));
return sb.toString();
}
我终于来了。感谢所有帮助过我的人。这是我与您分享的完整代码。
package com.nfcreadfull;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.util.List;
import android.nfc.FormatException;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
import android.os.Bundle;
import android.os.Handler;
import android.os.Parcelable;
import android.os.SystemClock;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
NfcAdapter mAdapter;
Tag mTag;
PendingIntent mPI;
IntentFilter mFilter[];
String userData,yo;
boolean writeMode;
Context context;
TextView tvNFCContent, Timer,Low, Uid;
Button start, pause, reset, lap ;
long MillisecondTime, StartTime, TimeBuff, UpdateTime = 0L ;
int Seconds, Minutes, MilliSeconds ;
ListView listView ;
String[] ListElements = new String[] { };
List<String> ListElementsArrayList ;
ArrayAdapter<String> adapter ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvNFCContent = (TextView) findViewById(R.id.data);
Timer = (TextView)findViewById(R.id.timer);
Uid = (TextView)findViewById(R.id.uid);
mAdapter = NfcAdapter.getDefaultAdapter(this);
mPI = PendingIntent.getActivity(getApplicationContext(), 0,
new Intent(this,getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP),0 );
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
IntentFilter filter2 = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
mFilter = new IntentFilter[]{tagDetected,filter2};
mAdapter = NfcAdapter.getDefaultAdapter(this);
if (mAdapter == null) {
// Stop here, we definitely need NFC
Toast.makeText(this, "This device doesn't support NFC.", Toast.LENGTH_LONG).show();
finish();
}
readFromIntent(getIntent());
}
private void readFromIntent(Intent intent) {
String action = intent.getAction();
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action))
{
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage[] msgs = null;
if (rawMsgs != null) {
msgs = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) {
msgs[i] = (NdefMessage) rawMsgs[i];
}
}
buildTagViews(msgs);
}
}
private void buildTagViews(NdefMessage[] msgs) {
if (msgs == null || msgs.length == 0) return;
String text = "";
// String tagId = new String(msgs[0].getRecords()[0].getType());
byte[] payload = msgs[0].getRecords()[0].getPayload();
String textEncoding = ((payload[0] & 128) == 0) ? "UTF-8" : "UTF-16"; // Get the Text Encoding
int languageCodeLength = payload[0] & 0063; // Get the Language Code, e.g. "en"
// String languageCode = new String(payload, 1, languageCodeLength, "US-ASCII");
try {
text = new String(payload, languageCodeLength + 1, payload.length - languageCodeLength - 1, textEncoding);
} catch (UnsupportedEncodingException e) {
Log.e("UnsupportedEncoding", e.toString());
}
tvNFCContent.setText("NFC Content: " + text);
}
NdefMessage[] getNdefMessage(Intent intent)
{
NdefMessage[] msgs = null;
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
if(rawMsgs != null)
{
msgs = new NdefMessage[rawMsgs.length];
for(int i=0; i<rawMsgs.length; i++)
{
msgs[i] = (NdefMessage)rawMsgs[i];
}
}
return msgs;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
protected void onNewIntent(Intent intent) {
// TODO Auto-generated method stub
Uid.setText(ByteArrayToHexString(intent.getByteArrayExtra(NfcAdapter.EXTRA_ID)));
setIntent(intent);
readFromIntent(intent);
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())){
mTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
}
super.onNewIntent(intent);
if(intent.getAction().equals(NfcAdapter.ACTION_NDEF_DISCOVERED))
{
Toast.makeText(getApplicationContext(),"Smartcard detected",Toast.LENGTH_SHORT).show();
}else if(intent.getAction().equals(NfcAdapter.ACTION_TAG_DISCOVERED))
{
mTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
NdefMessage[] messages = getNdefMessage(intent);
if(messages == null)
{
Toast.makeText(getApplicationContext(),"There Is No Data",Toast.LENGTH_SHORT).show();
return;
}
byte[] payload = messages[0].getRecords()[0].getPayload();
userData = new String(payload);
}else
{
Toast.makeText(getApplicationContext(),"Undefined smartcard",Toast.LENGTH_SHORT).show();
}
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) {
// While with ForegroundDispatch the NDEF message has already been read
// And passed to us in the intent and thus the time the App spends "read" the NFC card is Zero
// We want to time time the read, so now we have been notified that a NDEF card is in range
// Try and read from it
// Get the Tag from the intent
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
long startTime = 0;
long endTime = 0;
try {
// Create an NDEF tag object
Ndef ndefTag = Ndef.get(tag);
// This is the I/O operation to read the card and format the result to an NDEF message
// Nothing is done with the result to not add any time to it, as we are timing this
startTime = System.currentTimeMillis();
ndefTag.connect();
ndefTag.getNdefMessage();
endTime = System.currentTimeMillis();
ndefTag.close();
} catch (Exception e) {
Log.e("NFC", e.toString());
}
MillisecondTime = endTime - startTime;
UpdateTime = MillisecondTime;
Seconds = (int) (UpdateTime / 1000);
Minutes = Seconds / 60;
Seconds = Seconds % 60;
MilliSeconds = (int) (UpdateTime % 1000);
Timer.setText("" + Minutes + ":"
+ String.format("%02d", Seconds) + "."
+ String.format("%03d", MilliSeconds));
//Log.v("NFC", "Time to read in milliseconds is: " + (endTime - startTime));
//Timer.setText("00:00:0.0"+(endTime - startTime));
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
mAdapter.disableForegroundDispatch(this);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
IntentFilter ndefDetected = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
try {
ndefDetected.addDataType("*/*");
} catch (IntentFilter.MalformedMimeTypeException e) {}
IntentFilter techDetected = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
IntentFilter[] nfcIntentFilter = new IntentFilter[]{ndefDetected,techDetected,tagDetected};
PendingIntent pendingIntent = PendingIntent.getActivity(
this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
if(mAdapter!= null)
mAdapter.enableForegroundDispatch(this, pendingIntent, nfcIntentFilter, null);
}
private String getHex(byte[] bytes) {
if (bytes == null) {
return null;
}
char[] hexChars = new char[bytes.length * 2];
final char[] hexArray = "0123456789abcdef".toCharArray();
for (int j = 0; j < bytes.length; j++) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
private long getDec(byte[] bytes) {
long result = 0;
long factor = 1;
for (int i = 0; i < bytes.length; ++i) {
long value = bytes[i] & 0xffl;
result += value * factor;
factor *= 256l;
}
return result;
}
private String ByteArrayToHexString(byte [] inarray) {
Log.d("ByteArrayToHexString", inarray.toString());
int i, j, in;
String [] hex = {"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"};
String out= "";
for(j = 0 ; j < inarray.length ; ++j)
{
in = (int) inarray[j] & 0xff;
i = (in >> 4) & 0x0f;
out += hex[i];
i = in & 0x0f;
out += hex[i];
}
Log.d("ByteArrayToHexString", String.format("%0" + (inarray.length * 2) + "X", new BigInteger(1,inarray)));
return out;
}
}