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>