8、NFC技术：让Android自动打开网页

创建封装Uri的NdefRecord

 public  NdefRecord  createUri(String  uriString); 

public  NdefRecord  createUri(Uri  uri); 

范例：自动打开网页

 import android.app.Activity;

 import android.app.PendingIntent;

 import android.content.Intent;

 import android.net.Uri;

 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.widget.Toast;

 public class AutoOpenUriActivity extends Activity {

     private NfcAdapter nfcAdapter;

     private PendingIntent pendingIntent;

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_auto_open_uri);

         nfcAdapter = NfcAdapter.getDefaultAdapter(this);

         pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,

                 getClass()), 0);

     }

     @Override

     public void onResume() {

         super.onResume();

         if (nfcAdapter != null)

             nfcAdapter

                     .enableForegroundDispatch(this, pendingIntent, null, null);

     }

     @Override

     public void onNewIntent(Intent intent) {

         Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);

         writeNFCTag(detectedTag);

     }

     @Override

     public void onPause() {

         super.onPause();

         if (nfcAdapter != null)

             nfcAdapter.disableForegroundDispatch(this);

     }

     public void writeNFCTag(Tag tag) {

         if (tag == null) {

             return;

         }

         NdefMessage ndefMessage = new NdefMessage(

                 new NdefRecord[] { NdefRecord.createUri(Uri

                         .parse("http://www.baidu.com")) });

         int size = ndefMessage.toByteArray().length;

         try {

             Ndef ndef = Ndef.get(tag);

             if (ndef != null) { // 证明标签是否是NDEF格式

                 ndef.connect();

                 if (!ndef.isWritable()) {

                     return;

                 }

                 if (ndef.getMaxSize() < size) {

                     return;

                 }

                 ndef.writeNdefMessage(ndefMessage);

                 Toast.makeText(this, "ok", Toast.LENGTH_LONG).show();

             } else {

                 // 格式化成NDEF格式。

                 NdefFormatable format = NdefFormatable.get(tag);

                 if (format != null) {

                     format.connect();

                     format.format(ndefMessage);

                     Toast.makeText(this, "ok", Toast.LENGTH_LONG).show();

                 } else {

                     Toast.makeText(this, "formating is failed",

                             Toast.LENGTH_LONG).show();

                 }

             }

         } catch (Exception e) {

             // TODO: handle exception

         }

     }

 }

 <?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" >

     <TextView

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:layout_marginBottom="5dp"

         android:text="请将NFC标签或贴纸靠近手机背面"

         android:textSize="16sp" />

     <ImageView

         android:layout_width="match_parent"

         android:layout_height="match_parent"

         android:layout_margin="10dp"

         android:src="@drawable/read_nfc_tag" />

 </LinearLayout>

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

     package="cn.eoe.open.uri"

     android:versionCode="1"

     android:versionName="1.0" >

     <uses-sdk

         android:minSdkVersion="15"

         android:targetSdkVersion="15" />

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

     <application

         android:icon="@drawable/ic_launcher"

         android:label="@string/app_name"

         android:theme="@style/AppTheme" >

         <activity

             android:name="AutoOpenUriActivity"

             android:label="@string/title_activity_auto_run_application"

             android:launchMode="singleTop"

             android:screenOrientation="portrait" >

             <intent-filter>

                 <action android:name="android.intent.action.MAIN" />

                 <category android:name="android.intent.category.LAUNCHER" />

             </intent-filter>

         </activity>

     </application>

 </manifest>