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我有一个包含 2 个类的应用程序，CardActivity当 NFC 标签轻按/刷卡时，我需要我的应用程序打开第二个类。该应用程序可以正常打开，但MainActivity正在运行，而不是CardActivity.

我会冒险猜测这是我的清单的问题，但它看起来是正确的。这是无论如何：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.spotsofmagic.spotsofmagic"
    android:versionCode="1"
    android:versionName="1.0" android:installLocation="auto">

    <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="14" />

    <uses-permission android:name="android.permission.NFC" />
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-feature android:name="android.hardware.nfc" android:required="true" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >

        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

         <activity
            android:name=".CardActivity"
            android:label="@string/app_name" >

            <!-- Handle a collectable card NDEF record -->
            <intent-filter>
                <action android:name="android.nfc.action.NDEF_DISCOVERED"/>
                <data android:mimeType="application/vnd.spotsofmagic.spotsofmagic"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
         </activity>

    </application>

</manifest>

我确信标签本身是正确的，因为我已经在另一个应用程序中打开它来查看它的内容。

下面是两个类。

卡片活动：

package com.spotsofmagic.spotsofmagic;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.Log;
import android.bluetooth.*;

public class CardActivity extends Activity implements OnClickListener {

    private static final String TAG = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.card_activity);

        // see if app was started from a tag and show game console
        Intent intent = getIntent();

        Log.e(TAG, "Hello world.  Intent Type: "+ intent.getType());

        if(intent.getType() != null && intent.getType().equals(MimeType.NFC_DEMO)) {
            Parcelable[] rawMsgs = getIntent().getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
            NdefMessage msg = (NdefMessage) rawMsgs[0];
            NdefRecord cardRecord = msg.getRecords()[0];
            String payload = new String(cardRecord.getPayload());
            turnBluetoothOn(payload);
        }
    }

    private void turnBluetoothOn(String payload) {

        final AlertDialog.Builder builder=new AlertDialog.Builder(this);
        builder.setTitle("Alert Dialog");
        builder.setMessage(payload);
        builder.setIcon(android.R.drawable.ic_dialog_alert);


        BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if (mBluetoothAdapter == null) {
            // Device does not support Bluetooth
        }
        if (!mBluetoothAdapter.isEnabled()) {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, 1);
        }
        android.os.Process.killProcess(android.os.Process.myPid());

    }

    public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub

    }
}

主要活动：

package com.spotsofmagic.spotsofmagic;

import android.app.Activity;
import android.app.AlertDialog;
import android.bluetooth.BluetoothAdapter;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.Log;
import android.widget.TextView;


public class MainActivity extends Activity implements OnClickListener {
    private static final String TAG = "Activity...";
    private NfcAdapter mAdapter;
    private TextView mTextView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);

        // grab our NFC Adapter
        mAdapter = NfcAdapter.getDefaultAdapter(this);

        // TextView that we'll use to output messages to screen
        mTextView = (TextView)findViewById(R.id.text_view);

        displayMessage("Loading payload...");

    }

    private void displayMessage(String message) {
        mTextView.setText(message);
    }

    public void onClick(DialogInterface arg0, int arg1) {
        // TODO Auto-generated method stub

    }
}

这是我用来编写标签的代码。顺便说一句，这是在另一个应用程序上完成的：

NdefRecord appRecord = NdefRecord.createApplicationRecord("com.spotsofmagic.spotsofmagic");

        // record that contains our custom "retro console" game data, using custom MIME_TYPE
        byte[] payload = getPayload().getBytes();
        byte[] mimeBytes = MimeType.NFC_DEMO.getBytes(Charset.forName("US-ASCII"));
        NdefRecord cardRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, mimeBytes, 
                                                new byte[0], payload);
        NdefMessage message = new NdefMessage(new NdefRecord[] { cardRecord, appRecord});

// Some code here removed for readability


 Ndef ndef = Ndef.get(tag);
    if (ndef != null) {
        ndef.connect();
        ndef.writeNdefMessage(message);
4

1 回答 1

1

标签上的 NDEF 消息是否包含Android 应用程序记录？这可以解释 MainActivity 是如何启动的。但是，只有当 AAR 是标签上 NDEF 消息的第一条记录或者第一条记录与意图过滤器不匹配时，才会出现这种情况。

于 2012-08-30T20:59:57.980 回答