Android NFC读取电子标签
NFC,什么是NFC?想必大家都听过,就是近场通信,接下来我想给大家展示一个简单的demo, 这个demo是我在公司工作中开发的功能.希望这篇文章对大家有所帮助
目前在市场在见得比较多的电子标签有 1443 和15693 两种类型的卡片(当然还有其它类型的),这两种卡片是什么东东呢?自己百度一下,网上一大把资料有介绍的.
在我实际开发过程中就是主要接触这两种类型的卡片.我需要实现的功能是,利用带有NFC功能的手机,去读取电子标签中的数据(卡片id值这里叫UID),网上可以下载很多可以读取电子标签的app软件,但是,在我的demo里面, 是要屏蔽第三方的NFC扫描软件, 我只想用自己开发的软件去读取这些电子标签(即不使用前台调度,弹出个对话框,让我们选择使用哪个NFC软件去读取)
不多说, 直接上源码比较实在
package com.iotdc.android.app.nfc.activity;
import java.io.Serializable;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentFilter.MalformedMimeTypeException;
import android.graphics.Paint;
import android.nfc.NfcAdapter;
import android.nfc.NfcManager;
import android.nfc.tech.IsoDep;
import android.nfc.tech.MifareClassic;
import android.nfc.tech.MifareUltralight;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
import android.nfc.tech.NfcA;
import android.nfc.tech.NfcB;
import android.nfc.tech.NfcF;
import android.nfc.tech.NfcV;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.TextView;
import com.iotdc.android.app.scanner.R;
import com.iotdc.android.app.scanresult.activity.TwoDimensionCodeActivity;
import com.iotdc.android.app.utils.NFCUtil;
import com.iotdc.android.app.utils.NFCUtil.NFCData;
@SuppressLint("NewApi")
public class NFCActivity extends Activity {
// private Intent intent;
private TextView tvNfc;
private TextView tvOpenNfC;
private NfcManager manager;
private NfcAdapter adapter;
private PendingIntent mNfcPendingIntent;
private IntentFilter[] mWriteTagFilters;
private String[][] techListsArray;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nfc);
initTitile();
init();
initNFC();
}
private void init() {
tvNfc = (TextView) findViewById(R.id.tv_nfc);
tvOpenNfC = (TextView) findViewById(R.id.tv_open_nfc);
tvOpenNfC.getPaint().setFlags(Paint.UNDERLINE_TEXT_FLAG);
tvOpenNfC.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(NFCActivity.this,
NFCGuidActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.c_left_1_righttoleft,
R.anim.c_left_2_lefttoright);
}
});
}
@SuppressLint("NewApi")
public void initNFC() {
manager = (NfcManager) this.getSystemService(Context.NFC_SERVICE);
adapter = manager.getDefaultAdapter();
if (adapter != null) {
if (adapter.isEnabled()) {
tvNfc.setVisibility(View.GONE);
} else {
tvNfc.setVisibility(View.VISIBLE);
}
} else {
tvNfc.setVisibility(View.VISIBLE);
}
}
@Override
protected void onResume() {
super.onResume();
System.out.println("onResume");
if (adapter != null) {
mNfcPendingIntent = PendingIntent.getActivity(this, 0,
new Intent(this, getClass())
.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter ndefDetected = new IntentFilter(
NfcAdapter.ACTION_NDEF_DISCOVERED);
IntentFilter ndefDetected2 = new IntentFilter(
NfcAdapter.ACTION_TECH_DISCOVERED);
IntentFilter ndefDetected3 = new IntentFilter(
NfcAdapter.ACTION_TAG_DISCOVERED);
try {
ndefDetected.addDataType("*/*"); //
} catch (MalformedMimeTypeException e) {
throw new RuntimeException("fail", e);
}
techListsArray = new String[][] { new String[] {
NfcA.class.getName(), NfcV.class.getName(),
Ndef.class.getName(), NdefFormatable.class.getName(),
MifareClassic.class.getName(),
MifareUltralight.class.getName(), IsoDep.class.getName(),
NfcB.class.getName(), NfcF.class.getName() } };
mWriteTagFilters = new IntentFilter[] { ndefDetected,
ndefDetected2, ndefDetected3 };
adapter.enableForegroundDispatch(this, mNfcPendingIntent,
mWriteTagFilters, techListsArray);
Intent intent = this.getIntent();
resolveIntent(intent); // 这两行代码一定要写
}
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
System.out.println("onNewIntent");
resolveIntent(intent);
}
private void resolveIntent(Intent intent) {
if (adapter != null) {
NFCData nd = NFCUtil.getNFCIntentData(intent);
if (nd != null) {
String uid = nd.getUid();
if (uid != null && !"".equals(uid)) {
intent = new Intent(NFCActivity.this,
ResultActivity.class);
intent.putExtra("nfcData", (Serializable) nd);
startActivity(intent);
overridePendingTransition(R.anim.c_left_1_righttoleft,
R.anim.c_left_2_lefttoright);
}
}
}
}
@Override
protected void onPause() {
super.onPause();
if (adapter != null) {
adapter.disableForegroundDispatch(this);
}
}
public void initTitile() {
TextView tv_title = (TextView) findViewById(R.id.tv_title);
tv_title.setText(R.string.scan_nfc_title);
ImageView iv_left = (ImageView) findViewById(R.id.iv_left);
iv_left.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
overridePendingTransition(R.anim.c_right_1_lefttoright,
R.anim.c_right_2_righttoleft);
}
});
ImageView iv_right = (ImageView) findViewById(R.id.iv_right);
iv_right.setVisibility(View.INVISIBLE);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
this.finish();
overridePendingTransition(R.anim.c_right_1_lefttoright,
R.anim.c_right_2_righttoleft);
}
return super.onKeyDown(keyCode, event);
}
}
下面是activity_nfc的布局文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <include layout="@layout/title" /> <LinearLayout android:id="@+id/no_info_frag" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ImageView android:id="@+id/noRecord" android:layout_width="100dp" android:layout_height="100dp" android:layout_gravity="center" android:layout_marginTop="127dp" android:src="@drawable/nfc_bitmap" /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:layout_marginLeft="20dp" android:layout_marginRight="20dp" android:text="@string/NFCText" android:textColor="@color/golden" android:layout_gravity="center" android:gravity="center" android:textSize="15sp" /> <TextView android:id="@+id/tv_nfc" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:layout_marginLeft="50dp" android:layout_marginRight="50dp" android:text="@string/noNFCText" android:textColor="@color/red" android:layout_gravity="center" android:gravity="center" android:textSize="15sp" /> <TextView android:id="@+id/tv_open_nfc" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:text="@string/openNFCText" android:textColor="#004190" android:layout_gravity="center" android:textSize="18sp" /> </LinearLayout> </LinearLayout>
使用一个ResultActivity来显示NFC读取到电子标签的结果,用一个TextView 显示就是了, 大家都懂的
package com.iotdc.android.app.nfc.activity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.TextView;
import com.iotdc.android.app.config.SystemConfig;
import com.iotdc.android.app.scanner.R;
public class NFCResultActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nfc_result);
initTitleBar();
TextView tvRead = (TextView) findViewById(R.id.tv_nfc_read);
Intent data = this.getIntent();
String uid = data.getStringExtra("nfcResult");
String msg = data.getStringExtra("msg");
SystemConfig.error(msg, this);
tvRead.setText(uid);
}
private void initTitleBar(){
TextView tv_title = (TextView) findViewById(R.id.tv_title);
tv_title.setText(R.string.scan_nfc_title_result);
ImageView iv_left = (ImageView) findViewById(R.id.iv_left);
iv_left.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
overridePendingTransition(R.anim.c_right_1_lefttoright,
R.anim.c_right_2_righttoleft);
}
});
ImageView iv_right = (ImageView) findViewById(R.id.iv_right);
iv_right.setVisibility(View.INVISIBLE);
}
}
其中NFC读取数据的方法我写在了一个工具类中,叫NFCUtil
package com.iotdc.android.app.utils;
import java.io.Serializable;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import com.iotdc.android.app.nfc.TagBlockStream;
public class NFCUtil {
@SuppressLint("NewApi")
public static NFCData getNFCIntentData(Intent intent) {
NFCData nd = new NFCData();
String uid = "";
String data = "";
String action = intent.getAction(); // 判断nfc的类型,一共有三种
if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)) {
Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
TagBlockStream bs = TagBlockStream.getInstance(tagFromIntent);
byte[] blockContent = null;
// HonestTag hTag = null;
uid = HexUtility.byteArrayToString(tagFromIntent.getId());
if (bs != null) {
try {
bs.connect();
blockContent = bs.readBlock(0);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
bs.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
nd.setUid(uid); // 03190B0000014BE0
return nd;
}
public static class NFCData implements Serializable {
/**
* 标签UID 值
*/
private String uid;
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
}
}
到上面的话,逻辑代码就已经完成了, 注意, 没有完, NFC 一定要手机支持,并且要在Manifest.xml文件中进行权限配置
<uses-permission android:name="android.permission.NFC" />
还要在对activity 进行过滤
<activity android:name="com.iotdc.android.app.nfc.activity.NFCActivity" android:screenOrientation="portrait" > <!-- 这 一句一定是要的--> <intent-filter> <action android:name="android.nfc.action.NDEF_DISCOVERED" /> </intent-filter> </activity>
到这里, 所有的工作就都完成了, 对NFC 我也不是太了解,只是在工作中用到了, 目前在公司的话, 还没有接触过手机与手机之间的通信, 希望大神能够指导,共同进步