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>