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; } } } }
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(); } }
<?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>
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
