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

 1 import android.app.Activity;
 2 import android.app.PendingIntent;
 3 import android.content.Intent;
 4 import android.net.Uri;
 5 import android.nfc.NdefMessage;
 6 import android.nfc.NdefRecord;
 7 import android.nfc.NfcAdapter;
 8 import android.nfc.Tag;
 9 import android.nfc.tech.Ndef;
10 import android.nfc.tech.NdefFormatable;
11 import android.os.Bundle;
12 import android.widget.Toast;
13 
14 public class AutoOpenUriActivity extends Activity {
15     private NfcAdapter nfcAdapter;
16     private PendingIntent pendingIntent;
17 
18     @Override
19     public void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21 
22         setContentView(R.layout.activity_auto_open_uri);
23         nfcAdapter = NfcAdapter.getDefaultAdapter(this);
24         pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
25                 getClass()), 0);
26 
27     }
28 
29     @Override
30     public void onResume() {
31         super.onResume();
32         if (nfcAdapter != null)
33             nfcAdapter
34                     .enableForegroundDispatch(this, pendingIntent, null, null);
35     }
36 
37     @Override
38     public void onNewIntent(Intent intent) {
39         Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
40         writeNFCTag(detectedTag);
41     }
42 
43     @Override
44     public void onPause() {
45         super.onPause();
46         if (nfcAdapter != null)
47             nfcAdapter.disableForegroundDispatch(this);
48 
49     }
50 
51     public void writeNFCTag(Tag tag) {
52         if (tag == null) {
53             return;
54         }
55         NdefMessage ndefMessage = new NdefMessage(
56                 new NdefRecord[] { NdefRecord.createUri(Uri
57                         .parse("http://www.baidu.com")) });
58         int size = ndefMessage.toByteArray().length;
59         try {
60             Ndef ndef = Ndef.get(tag);
61 
62             if (ndef != null) { // 证明标签是否是NDEF格式
63                 ndef.connect();
64                 if (!ndef.isWritable()) {
65                     return;
66                 }
67                 if (ndef.getMaxSize() < size) {
68                     return;
69                 }
70                 ndef.writeNdefMessage(ndefMessage);
71                 Toast.makeText(this, "ok", Toast.LENGTH_LONG).show();
72             } else {
73                 // 格式化成NDEF格式。
74                 NdefFormatable format = NdefFormatable.get(tag);
75                 if (format != null) {
76                     format.connect();
77                     format.format(ndefMessage);
78                     Toast.makeText(this, "ok", Toast.LENGTH_LONG).show();
79 
80                 } else {
81                     Toast.makeText(this, "formating is failed",
82                             Toast.LENGTH_LONG).show();
83                 }
84 
85             }
86 
87         } catch (Exception e) {
88             // TODO: handle exception
89         }
90 
91     }
92 
93 }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <TextView
 8         android:layout_width="match_parent"
 9         android:layout_height="wrap_content"
10         android:layout_marginBottom="5dp"
11         android:text="请将NFC标签或贴纸靠近手机背面"
12         android:textSize="16sp" />
13 
14     <ImageView
15         android:layout_width="match_parent"
16         android:layout_height="match_parent"
17         android:layout_margin="10dp"
18         android:src="@drawable/read_nfc_tag" />
19 
20 </LinearLayout>

 1 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 2     package="cn.eoe.open.uri"
 3     android:versionCode="1"
 4     android:versionName="1.0" >
 5 
 6     <uses-sdk
 7         android:minSdkVersion="15"
 8         android:targetSdkVersion="15" />
 9 
10     <uses-permission android:name="android.permission.NFC" />
11 
12     <application
13         android:icon="@drawable/ic_launcher"
14         android:label="@string/app_name"
15         android:theme="@style/AppTheme" >
16         <activity
17             android:name="AutoOpenUriActivity"
18             android:label="@string/title_activity_auto_run_application"
19             android:launchMode="singleTop"
20             android:screenOrientation="portrait" >
21             <intent-filter>
22                 <action android:name="android.intent.action.MAIN" />
23 
24                 <category android:name="android.intent.category.LAUNCHER" />
25             </intent-filter>
26         </activity>
27 
28     </application>
29 
30 </manifest>

posted on 2014-07-20 17:19 大米稀饭阅读(1299) 评论(0) 编辑收藏举报