NFC读写实例
package com.sy.nfc.test; import java.io.IOException; import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.MifareClassic;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
import android.nfc.tech.NfcA;
import android.os.Bundle;
import android.os.Parcelable;
import android.annotation.SuppressLint;
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.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast; /**
*
* @author shenyang
* @see
* @des
*
* Nfc 标签的扫描
*
*
*/
@SuppressLint("NewApi")
public class ReadTag extends Activity {
private NfcAdapter nfcAdapter;
private TextView resultText;
private PendingIntent pendingIntent;
private IntentFilter[] mFilters;
private String[][] mTechLists;
private Button mJumpTagBtn;
private boolean isFirst = true; @SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 获取nfc适配器,判断设备是否支持NFC功能
nfcAdapter = NfcAdapter.getDefaultAdapter(this);
if (nfcAdapter == null) {
Toast.makeText(this, getResources().getString(R.string.no_nfc),
Toast.LENGTH_SHORT).show();
finish();
return;
} else if (!nfcAdapter.isEnabled()) {
Toast.makeText(this, getResources().getString(R.string.open_nfc),
Toast.LENGTH_SHORT).show();
finish();
return;
}
setContentView(R.layout.read_tag);
// 显示结果Text
resultText = (TextView) findViewById(R.id.resultText);
// 写入标签按钮
mJumpTagBtn = (Button) findViewById(R.id.jump);
mJumpTagBtn.setOnClickListener(new WriteBtnOnClick()); pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
ndef.addCategory("*/*");
mFilters = new IntentFilter[] { ndef };// 过滤器
mTechLists = new String[][] {
new String[] { MifareClassic.class.getName() },
new String[] { NfcA.class.getName() } };// 允许扫描的标签类型 } @SuppressLint("NewApi")
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
nfcAdapter.enableForegroundDispatch(this, pendingIntent, mFilters,
mTechLists);
if (isFirst) {
if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) {
String result = processIntent(getIntent());
resultText.setText(result);
}
isFirst = false;
} } @Override
protected void onNewIntent(Intent intent) {
// TODO Auto-generated method stub
super.onNewIntent(intent);
if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())) {
String result = processIntent(intent);
resultText.setText(result);
}
} /**
* 获取tab标签中的内容
*
* @param intent
* @return
*/
@SuppressLint("NewApi")
private String processIntent(Intent intent) {
Parcelable[] rawmsgs = intent
.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage msg = (NdefMessage) rawmsgs[0];
NdefRecord[] records = msg.getRecords();
String resultStr = new String(records[0].getPayload());
return resultStr;
} /**
* 按钮点击事件
*
* @author shenyang
*
*/
class WriteBtnOnClick implements OnClickListener { @Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.jump:
Intent intent = new Intent(ReadTag.this, WriteTag.class);
startActivity(intent);
default:
break;
}
} } }
读标签内容代码展开
package com.sy.nfc.test; import java.io.IOException; import android.annotation.SuppressLint;
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.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.MifareClassic;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
import android.nfc.tech.NfcA;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast; /**
* 写入标签
*
* @warn:弹出dialog 允许写入
* @author shenyang
*
*/
@SuppressLint("NewApi")
public class WriteTag extends Activity { private IntentFilter[] mWriteTagFilters;
private NfcAdapter nfcAdapter;
PendingIntent pendingIntent;
String[][] mTechLists;
Button writeBtn;
boolean isWrite = false;
EditText mContentEditText; @Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.write_tag);
writeBtn = (Button) findViewById(R.id.writeBtn);
writeBtn.setOnClickListener(new WriteOnClick());
mContentEditText = (EditText) findViewById(R.id.content_edit);
// 获取nfc适配器,判断设备是否支持NFC功能
nfcAdapter = NfcAdapter.getDefaultAdapter(this);
if (nfcAdapter == null) {
Toast.makeText(this, getResources().getString(R.string.no_nfc),
Toast.LENGTH_SHORT).show();
finish();
return;
} else if (!nfcAdapter.isEnabled()) {
Toast.makeText(this, getResources().getString(R.string.open_nfc),
Toast.LENGTH_SHORT).show();
finish();
return;
}
pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
// 写入标签权限
IntentFilter writeFilter = new IntentFilter(
NfcAdapter.ACTION_TECH_DISCOVERED);
mWriteTagFilters = new IntentFilter[] { writeFilter };
mTechLists = new String[][] {
new String[] { MifareClassic.class.getName() },
new String[] { NfcA.class.getName() } };// 允许扫描的标签类型 } /**
* 写入标签按钮点击事件监听
*
* @author shenyang
*
*/
class WriteOnClick implements OnClickListener { @Override
public void onClick(View v) {
// TODO Auto-generated method stub
isWrite = true;
AlertDialog.Builder builder = new AlertDialog.Builder(WriteTag.this)
.setTitle("请将标签靠近!");
builder.setNegativeButton("确定",
new DialogInterface.OnClickListener() { @Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
mContentEditText.setText("");
isWrite = false;
WriteTag.this.finish();
}
});
builder.setPositiveButton("取消",
new DialogInterface.OnClickListener() { @Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
isWrite = false;
}
});
builder.create();
builder.show();
}
} @Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
nfcAdapter.enableForegroundDispatch(this, pendingIntent,
mWriteTagFilters, mTechLists);
} // 写入模式时,才执行写入操作
@Override
protected void onNewIntent(Intent intent) {
// TODO Auto-generated method stub
super.onNewIntent(intent);
if (isWrite == true
&& NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())) {
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
NdefMessage ndefMessage = getNoteAsNdef();
if (ndefMessage != null) {
writeTag(getNoteAsNdef(), tag);
} else {
showToast("请输入您要写入标签的内容");
}
}
} // 根据文本生成一个NdefRecord
private NdefMessage getNoteAsNdef() {
String text = mContentEditText.getText().toString();
if (text.equals("")) {
return null;
} else {
byte[] textBytes = text.getBytes();
// image/jpeg text/plain
NdefRecord textRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA,
"image/jpeg".getBytes(), new byte[] {}, textBytes);
return new NdefMessage(new NdefRecord[] { textRecord });
} } // 写入tag
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()) {
showToast("tag不允许写入");
return false;
}
if (ndef.getMaxSize() < size) {
showToast("文件大小超出容量");
return false;
} ndef.writeNdefMessage(message);
showToast("写入数据成功.");
return true;
} else {
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
try {
format.connect();
format.format(message);
showToast("格式化tag并且写入message");
return true;
} catch (IOException e) {
showToast("格式化tag失败.");
return false;
}
} else {
showToast("Tag不支持NDEF");
return false;
}
}
} catch (Exception e) {
showToast("写入数据失败");
} return false;
} private void showToast(String text) {
Toast.makeText(this, text, Toast.LENGTH_SHORT).show();
}
}
写入标签代码展开
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.sy.nfc.test"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" /> <uses-permission android:name="android.permission.NFC" /> <uses-feature
android:name="android.hardware.nfc"
android:required="true" /> <application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.sy.nfc.test.ReadTag"
android:label="@string/app_name"
android:launchMode="singleTop" >
<intent-filter>
<action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.TECH_DISCOVERED" />
</intent-filter> <meta-data
android:name="android.nfc.action.TECH_DISCOVERED"
android:resource="@xml/nfc_tech_filter" />
</activity>
<activity android:name="com.sy.nfc.test.WriteTag" >
<intent-filter>
<action android:name="android.nfc.action.TAG_DISCOVERED" />
</intent-filter>
</activity>
</application> </manifest>
配置文件展开
已经非常详细了。源码下载:
http://download.csdn.net/detail/sy_hx/6307597
可以直接运行。主要就是NFC的读写实例。有需要的下载看看
点我下载
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