本篇文章为大家展示了如何使用Android实现NFC读取校园卡，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
主程序：
package com.nfclab.stuCard;
import java.io.IOException;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
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.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class stuCardActivity extends Activity {
private NfcAdapter mNfcAdapter;
private PendingIntent mPendingIntent;
private IntentFilter[] mFilters;
private String[][] mTechLists;
private String studentId="";
private String studentName=" ";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final EditText studentIdEditText = (EditText)this.findViewById(R.id.studentIdEditText);
final EditText studentNameEditText = (EditText)this.findViewById(R.id.studentNameEditText);
Button writeStudentButton = (Button)this.findViewById(R.id.writeStudentButton);
writeStudentButton.setOnClickListener(new android.view.View.OnClickListener()
{
public void onClick(View view) {
studentId = studentIdEditText.getText().toString();
studentName = studentNameEditText.getText().toString();
TextView messageText = (TextView)findViewById(R.id.messageText);
messageText.setText("Touch NFC Tag to write \n");
messageText.append("Student id:" + studentId + "\nStudent Name: " + studentName );
}
});
Button exitButton = (Button)findViewById(R.id.exitButton);
exitButton.setOnClickListener(new android.view.View.OnClickListener()
{
public void onClick(View v) {
finish();
}
});
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
mPendingIntent = PendingIntent.getActivity(this, 0,
new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
//ndef.addDataScheme("http");
mFilters = new IntentFilter[] {
ndef,
};
mTechLists = new String[][] { new String[] { Ndef.class.getName() },
new String[] { NdefFormatable.class.getName() }};
}
@Override
public void onResume() {
super.onResume();
if (mNfcAdapter != null) mNfcAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters,
mTechLists);
}
@Override
public void onNewIntent(Intent intent) {
Log.i("Foreground dispatch", "Discovered tag with intent: " + intent);
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
String externalType = "nfclab.com:transport";
String payload = studentId+":"+studentName;
NdefRecord extRecord1 = new NdefRecord(NdefRecord.TNF_EXTERNAL_TYPE, externalType.getBytes(), new byte[0], payload.getBytes());
NdefMessage newMessage = new NdefMessage(new NdefRecord[] { extRecord1});
writeNdefMessageToTag(newMessage, tag);
}
@Override
public void onPause() {
super.onPause();
mNfcAdapter.disableForegroundDispatch(this);
}
boolean writeNdefMessageToTag(NdefMessage message, Tag detectedTag) {
int size = message.toByteArray().length;
try {
Ndef ndef = Ndef.get(detectedTag);
if (ndef != null) {
ndef.connect();
if (!ndef.isWritable()) {
Toast.makeText(this, "Tag is read-only.", Toast.LENGTH_SHORT).show();
return false;
}
if (ndef.getMaxSize() < size) {
Toast.makeText(this, "The data cannot written to tag, Tag capacity is " + ndef.getMaxSize() + " bytes, message is " + size + " bytes.", Toast.LENGTH_SHORT).show();
return false;
}
ndef.writeNdefMessage(message);
ndef.close();
Toast.makeText(this, "Message is written tag.", Toast.LENGTH_SHORT).show();
return true;
} else {
NdefFormatable ndefFormat = NdefFormatable.get(detectedTag);
if (ndefFormat != null) {
try {
ndefFormat.connect();
ndefFormat.format(message);
ndefFormat.close();
Toast.makeText(this, "The data is written to the tag ", Toast.LENGTH_SHORT).show();
return true;
} catch (IOException e) {
Toast.makeText(this, "Failed to format tag", Toast.LENGTH_SHORT).show();
return false;
}
} else {
Toast.makeText(this, "NDEF is not supported", Toast.LENGTH_SHORT).show();
return false;
}
}
} catch (Exception e) {
Toast.makeText(this, "Write opreation is failed", Toast.LENGTH_SHORT).show();
}
return false;
}
}布局文件：
<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:columnCount="2"
android:orientation="horizontal"
android:rowCount="5" >
<TextView
android:id="@+id/requestStudentId"
android:layout_row="0"
android:layout_column="0"
android:text="@string/requestStudentIdText"
android:textSize="16sp" />
<EditText
android:id="@+id/studentIdEditText"
android:layout_row="0"
android:layout_column="1"
android:inputType="text"
android:text="@string/emptyText" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/requestName"
android:layout_row="1"
android:layout_column="0"
android:text="@string/requestStudentNameText"
android:textSize="16sp" ></TextView>
<EditText
android:id="@+id/studentNameEditText"
android:layout_row="1"
android:layout_column="1"
android:inputType="text"
android:text="@string/emptyText" >
</EditText>
<TextView
android:id="@+id/messageText"
android:layout_row="3"
android:layout_column="0"
android:layout_columnSpan="2"
android:gravity="left"
android:text="@string/emptyText"
android:textSize="24sp" />
<Button
android:id="@+id/writeStudentButton"
android:layout_row="2"
android:layout_column="0"
android:gravity="left"
android:text="@string/writeButtonText" />
<Button
android:id="@+id/exitButton"
android:layout_row="2"
android:layout_column="1"
android:gravity="left"
android:text="@string/exitButtonText" />
</GridLayout>
配置文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.nfclab.transportationwriter"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="14" />
<uses-permission android:name="android.permission.NFC" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".stuCardActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
上述内容就是如何使用Android实现NFC读取校园卡，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注天达云行业资讯频道。