NFC- Writing and Reading Mutiple Records at a time

Posted by Unknown April 27, 2013

NFC- Writing and Reading Mutiple Records at a time

I'm writting this article to help an android developers who is working in NFC and getting confused on how to write multiple records and how to read them at a go .

I want you to do the following steps ...

copy the following xml into your layout/yourfile

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<TableLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true" >

<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >

<TextView

android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:layout_marginLeft="90dp"
android:typeface="serif"/>
</TableRow>

<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >

<TextView

android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="90dp"
android:text="New Connection "
android:typeface="serif" />

</TableRow>

<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >

<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Name"
android:layout_weight="1"/>

<EditText
android:id="@+id/newconnection_usrname_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>
<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="E-mail Id"
android:layout_weight="1"/>

<EditText
android:id="@+id/newconnection_customerId_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>

<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Package"
android:layout_weight="1"/>

<EditText
android:id="@+id/newconnection_package_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>
<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Mobile Number"
android:layout_weight="1"/>

<EditText
android:id="@+id/newconnection_mobile_num_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>
<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="E-mail"
android:layout_weight="1"/>

<EditText
android:id="@+id/newconnection_email_id_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>
<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Address1"
android:layout_weight="1"/>

<EditText
android:id="@+id/newcoxn_address1_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>

<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Address2"
android:layout_weight="1"/>

<EditText
android:id="@+id/newcoxn_address2_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>
<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="city"
android:layout_weight="1"/>

<EditText
android:id="@+id/newcoxn_city_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>

<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="State"
android:layout_weight="1"/>

<EditText
android:id="@+id/newcoxn_state_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>
<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Zip"
android:layout_weight="1"/>

<EditText
android:id="@+id/newcoxn_zip_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>

<TableRow

android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView

android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Matital Status"
android:layout_weight="1"/>

<EditText
android:id="@+id/newconnection_connectioncreated_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
>

<requestFocus />
</EditText>

</TableRow>

<Button
android:id="@+id/writetag"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Write Tag" />

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Upload to server" />

<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Pending datas" />

<Button
android:id="@+id/canceldialogbutton"
android:layout_width="50dp"
android:layout_height="wrap_content"
android:text="cancel Dialog" />

</TableLayout>

</RelativeLayout>

NFCAndroid.java

package rakesh.android;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.PendingIntent;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentFilter.MalformedMimeTypeException;
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.Parcelable;

import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import java.io.IOException;

public class NFCAndroid extends Activity {
private static final String TAG = "rakesh android";
private boolean mResumed = false;
private boolean mWriteMode = false;
NfcAdapter mNfcAdapter;
EditText mNote,mnote1,mnote2,mnote3,mnote4,mnote5,mnote6,mnote7,mnote8,mnote9,mnote10;

PendingIntent mNfcPendingIntent;
IntentFilter[] mWriteTagFilters;
IntentFilter[] mNdefExchangeFilters;
byte[] payload5,payload1,payload2,payload3,payload4,payload6,payload7,payload8,payload9,payload10,payload11;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);

setContentView(R.layout.newconnection);
findViewById(R.id.writetag).setOnClickListener(mTagWriter);
mNote = ((EditText) findViewById(R.id.newconnection_usrname_content));
mnote1 = ((EditText) findViewById(R.id.newconnection_customerId_content));
mnote2 = ((EditText) findViewById(R.id.newconnection_package_content));
mnote3 = ((EditText) findViewById(R.id.newconnection_mobile_num_content));
mnote4 = ((EditText) findViewById(R.id.newconnection_email_id_content));
mnote5 = ((EditText) findViewById(R.id.newcoxn_address1_content));
mnote6 = ((EditText) findViewById(R.id.newcoxn_address2_content));
mnote7 = ((EditText) findViewById(R.id.newcoxn_city_content));
mnote8 = ((EditText) findViewById(R.id.newcoxn_state_content));
mnote9 = ((EditText) findViewById(R.id.newcoxn_zip_content));
mnote10 = ((EditText) findViewById(R.id.newconnection_connectioncreated_content));

mNote.addTextChangedListener(mTextWatcher);
mnote1.addTextChangedListener(mTextWatcher);
mnote2.addTextChangedListener(mTextWatcher);
mnote3.addTextChangedListener(mTextWatcher);
mnote4.addTextChangedListener(mTextWatcher);
mnote5.addTextChangedListener(mTextWatcher);
mnote6.addTextChangedListener(mTextWatcher);
mnote7.addTextChangedListener(mTextWatcher);
mnote8.addTextChangedListener(mTextWatcher);
mnote9.addTextChangedListener(mTextWatcher);
mnote10.addTextChangedListener(mTextWatcher);

// Handle all of our received NFC intents in this activity.
mNfcPendingIntent = PendingIntent.getActivity(this, 0,
new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);

// Intent filters for reading a note from a tag or exchanging over p2p.
IntentFilter ndefDetected = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
try {
ndefDetected.addDataType("text/plain");
} catch (MalformedMimeTypeException e) { }
mNdefExchangeFilters = new IntentFilter[] { ndefDetected };

// Intent filters for writing to a tag
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
mWriteTagFilters = new IntentFilter[] { tagDetected };
}

@Override
protected void onResume() {
super.onResume();
mResumed = true;
// Sticky notes received from Android
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) {

NdefMessage[] msgs = getNdefMessages(getIntent());
NdefRecord[] ndefRecords = msgs[0].getRecords();
int totalRecords = ndefRecords.length;
if(totalRecords == 11)
{
NdefRecord ndefRecord1 = msgs[0].getRecords()[0];
NdefRecord ndefRecord2 = msgs[0].getRecords()[1];
NdefRecord ndefRecord3 = msgs[0].getRecords()[2];
NdefRecord ndefRecord4 = msgs[0].getRecords()[3];
NdefRecord ndefRecord5 = msgs[0].getRecords()[4];
NdefRecord ndefRecord6 = msgs[0].getRecords()[5];
NdefRecord ndefRecord7 = msgs[0].getRecords()[6];
NdefRecord ndefRecord8 = msgs[0].getRecords()[7];
NdefRecord ndefRecord9 = msgs[0].getRecords()[8];
NdefRecord ndefRecord10 = msgs[0].getRecords()[9];
NdefRecord ndefRecord11 = msgs[0].getRecords()[10];

payload1 = ndefRecord1.getPayload();
payload2 = ndefRecord2.getPayload();
payload3 = ndefRecord3.getPayload();
payload4 = ndefRecord4.getPayload();
payload5 = ndefRecord5.getPayload();
payload6 = ndefRecord6.getPayload();
payload7 = ndefRecord7.getPayload();
payload8 = ndefRecord8.getPayload();
payload9 = ndefRecord9.getPayload();
payload10 = ndefRecord10.getPayload();
payload11 = ndefRecord11.getPayload();

}

/*
NdefMessage[] messages = getNdefMessages(getIntent());
payload = messages[0].getRecords()[0].getPayload();
payload1 = messages[0].getRecords()[1].getPayload();
payload2 = messages[1].getRecords()[0].getPayload();
payload3 = messages[1].getRecords()[1].getPayload();
payload4 = messages[0].getRecords()[4].getPayload();*/

setNoteBody(new String(payload1),new String(payload2),new String(payload3),new String(payload4),new String(payload5),new String(payload6),new String(payload7),new String(payload8),new String(payload9),new String(payload10),new String(payload11));
setIntent(new Intent()); // Consume this intent.
}
enableNdefExchangeMode();
}

@Override
protected void onPause() {
super.onPause();
mResumed = false;
mNfcAdapter.disableForegroundNdefPush(this);
}

@Override
protected void onNewIntent(Intent intent) {
// NDEF exchange mode
if (!mWriteMode && NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) {
NdefMessage[] msgs = getNdefMessages(intent);
promptForContent(msgs);

}

// Tag writing mode
if (mWriteMode && NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) {
Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
writeTag(getNoteAsNdef(), detectedTag);
}
}

private TextWatcher mTextWatcher = new TextWatcher() {

@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {

}

@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {

}

@Override
public void afterTextChanged(Editable arg0) {
if (mResumed) {
mNfcAdapter.enableForegroundNdefPush(NFCAndroid.this, getNoteAsNdef());
}
}
};

private View.OnClickListener mTagWriter = new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// Write to a tag for as long as the dialog is shown.
disableNdefExchangeMode();
enableTagWriteMode();

new AlertDialog.Builder(NFCAndroid.this).setTitle("Touch tag to write")
.setOnCancelListener(new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
disableTagWriteMode();

enableNdefExchangeMode();
}
}).create().show();
}
};

private void promptForContent(final NdefMessage[] msg) {
new AlertDialog.Builder(this).setTitle("Replace current content?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {

NdefRecord firstRecord = msg[0].getRecords()[0];
String body = new String(firstRecord.getPayload());

NdefRecord firstRecord1 = msg[0].getRecords()[1];
String body1 = new String(firstRecord1.getPayload());

NdefRecord firstRecord2= msg[0].getRecords()[2];
String body2 = new String(firstRecord2.getPayload());

NdefRecord firstRecord3 = msg[0].getRecords()[3];
String body3 = new String(firstRecord3.getPayload());

NdefRecord firstRecord4 = msg[0].getRecords()[4];
String body4 = new String(firstRecord4.getPayload());

NdefRecord firstRecord5 = msg[0].getRecords()[5];
String body5 = new String(firstRecord5.getPayload());

NdefRecord firstRecord6 = msg[0].getRecords()[6];
String body6 = new String(firstRecord6.getPayload());

NdefRecord firstRecord7 = msg[0].getRecords()[7];
String body7 = new String(firstRecord7.getPayload());

NdefRecord firstRecord8 = msg[0].getRecords()[8];
String body8 = new String(firstRecord8.getPayload());

NdefRecord firstRecord9 = msg[0].getRecords()[9];
String body9 = new String(firstRecord9.getPayload());

NdefRecord firstRecord10 = msg[0].getRecords()[10];
String body10 = new String(firstRecord10.getPayload());

setNoteBody(body,body1,body2,body3,body4,body5,body6,body7,body8,body9,body10);
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {

}
}).show();
}

private void setNoteBody(String body,String body1,String body2,String body3,String body4,String body5,String body6,String body7,String body8,String body9,String body10) {

Editable text = mNote.getText();
text.clear();
text.append(body);

Editable text1 = mnote1.getText();
text1.clear();
text1.append(body1);

Editable text2 = mnote2.getText();
text2.clear();
text2.append(body2);

Editable text3 = mnote3.getText();
text3.clear();
text3.append(body3);

Editable text4 = mnote4.getText();
text4.clear();
text4.append(body4);

Editable text5 = mnote5.getText();
text5.clear();
text5.append(body5);

Editable text6 = mnote6.getText();
text6.clear();
text6.append(body6);

Editable text7 = mnote7.getText();
text7.clear();
text7.append(body7);

Editable text8 = mnote8.getText();
text8.clear();
text8.append(body8);

Editable text9 = mnote9.getText();
text9.clear();
text9.append(body9);

Editable text10 = mnote10.getText();
text10.clear();
text10.append(body10);

}

private NdefMessage getNoteAsNdef() {

byte[] textBytes=mNote.getText().toString().getBytes(); ;
NdefRecord textRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(), new byte[] {}, textBytes);

byte[] textBytes1=mnote1.getText().toString().getBytes(); ;
NdefRecord textRecord1 = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(), new byte[] {}, textBytes1);

byte[] textBytes2=mnote2.getText().toString().getBytes(); ;
NdefRecord textRecord2= new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(),new byte[] {}, textBytes2);

byte[] textBytes3=mnote3.getText().toString().getBytes(); ;
NdefRecord textRecord3 = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(), new byte[] {}, textBytes3);

byte[] textBytes4=mnote4.getText().toString().getBytes(); ;
NdefRecord textRecord4 = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(),new byte[] {}, textBytes4);

byte[] textBytes5=mnote5.getText().toString().getBytes(); ;
NdefRecord textRecord5 = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(),new byte[] {}, textBytes5);

byte[] textBytes6=mnote6.getText().toString().getBytes(); ;
NdefRecord textRecord6 = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(),new byte[] {}, textBytes6);

byte[] textBytes7=mnote7.getText().toString().getBytes(); ;
NdefRecord textRecord7 = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(),new byte[] {}, textBytes7);

byte[] textBytes8=mnote8.getText().toString().getBytes(); ;
NdefRecord textRecord8 = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(),new byte[] {}, textBytes8);

byte[] textBytes9=mnote9.getText().toString().getBytes(); ;
NdefRecord textRecord9 = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(),new byte[] {}, textBytes9);

byte[] textBytes10=mnote10.getText().toString().getBytes(); ;
NdefRecord textRecord10 = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(),new byte[] {}, textBytes10);

return new NdefMessage(new NdefRecord[] { textRecord,textRecord1,textRecord2,textRecord3,textRecord4,textRecord5,textRecord6,textRecord7,textRecord8,textRecord9,textRecord10});

}

NdefMessage[] getNdefMessages(Intent intent) {
// Parse the intent
NdefMessage[] msgs = null;
String action = intent.getAction();
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
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];
}
} else {
// Unknown tag type
byte[] empty = new byte[] {};
NdefRecord record = new NdefRecord(NdefRecord.TNF_UNKNOWN, empty, empty, empty);
NdefMessage msg = new NdefMessage(new NdefRecord[] {
record
});
msgs = new NdefMessage[] {
msg
};
}
} else {
Log.d(TAG, "Unknown intent.");
finish();
}
return msgs;
}

private void enableNdefExchangeMode() {
mNfcAdapter.enableForegroundNdefPush(NFCAndroid.this, getNoteAsNdef());
mNfcAdapter.enableForegroundDispatch(this, mNfcPendingIntent, mNdefExchangeFilters, null);
}

private void disableNdefExchangeMode() {
mNfcAdapter.disableForegroundNdefPush(this);
mNfcAdapter.disableForegroundDispatch(this);
}

private void enableTagWriteMode() {
mWriteMode = true;
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
mWriteTagFilters = new IntentFilter[] {
tagDetected
};
mNfcAdapter.enableForegroundDispatch(this, mNfcPendingIntent, mWriteTagFilters, null);
}

private void disableTagWriteMode() {
mWriteMode = false;
mNfcAdapter.disableForegroundDispatch(this);
}

boolean writeTag(NdefMessage message, Tag tag) {
int size = message.toByteArray().length;

try {
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
ndef.connect();

if (!ndef.isWritable()) {
toast("Tag is read-only.");
return false;
}
if (ndef.getMaxSize() < size) {
toast("Tag capacity is " + ndef.getMaxSize() + " bytes, message is " + size
+ " bytes.");
return false;
}

ndef.writeNdefMessage(message);
toast("Wrote message to pre-formatted tag.");
return true;
} else {
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
try {
format.connect();
format.format(message);
toast("Formatted tag and wrote message");
return true;
} catch (IOException e) {
toast("Failed to format tag.");
return false;
}
} else {
toast("Tag doesn't support NDEF.");
return false;
}
}
} catch (Exception e) {
toast("Failed to write tag");
}

return false;
}

private void toast(String text) {
Toast.makeText(this, text, Toast.LENGTH_SHORT).show();
}
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="rakesh.android"

android:versionCode="1"

android:versionName="1.0">

<uses-sdk android:minSdkVersion="10" />

<uses-permission android:name="android.permission.NFC"></uses-permission>

<activity android:name="rakesh.android.NFCAndroid"

android:label="@string/app_name">

<intent-filter>

</intent-filter>

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

Note :you have to open directly to write the tag. and open using NFC tag to read the Tag

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NFC- Writing and Reading Mutiple Records at a time

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