我确信这很简单，但我无法弄清楚。我要做的就是通过 NFC 发送消息。如果我将它发送到主要活动，我的代码可以完美地工作，但我不知道如何将它发送到不同的活动。我已经查看了 Android 开发人员页面上的 NFC 和 Intent Filter 文章，但仍然不确定如何执行此操作。我正在尝试将其发送到 NFC 活动，我将在下面发布我的清单和 NFC 类。
显现：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.justbaumdev.tagsense"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.NFC" />
<uses-feature android:name="android.hardware.nfc" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@android:style/Theme.Holo" >
<activity
android:name=".TagSense"
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="com.justbaumdev.tagsense.NFC" android:exported="false">
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="application/com.justbaumdev.tagsense" />
</intent-filter>
</activity>
</application>
</manifest>
NFC类：
package com.justbaumdev.tagsense;
import org.json.JSONArray;
import org.json.JSONException;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.wifi.WifiManager;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.NfcAdapter.CreateNdefMessageCallback;
import android.nfc.NfcAdapter.OnNdefPushCompleteCallback;
import android.nfc.NfcEvent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Parcelable;
import android.widget.Toast;
public class NFC extends Activity implements CreateNdefMessageCallback, OnNdefPushCompleteCallback {
private NfcAdapter mNfcAdapter;
private static final int MESSAGE_SENT = 1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.nfc);
mNfcAdapter = NfcAdapter.getDefaultAdapter(this); // Check for available NFC Adapter
if (mNfcAdapter == null)
{
Toast.makeText(this, "NFC is not available", Toast.LENGTH_LONG).show();
finish();
return;
}
else
{
mNfcAdapter.setNdefPushMessageCallback(this, this); // Register callback to set NDEF message
mNfcAdapter.setOnNdefPushCompleteCallback(this, this); // Register callback to listen for message-sent success
}
}
@Override
public void onResume() {
super.onResume();
// Check to see that the Activity started due to an Android Beam
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) {
processIntent(getIntent());
}
}
@Override
public void onNewIntent(Intent intent) {
// onResume gets called after this to handle the intent
setIntent(intent);
}
@Override
public NdefMessage createNdefMessage(NfcEvent event) {
WifiManager wm = (WifiManager) getSystemService(Context.WIFI_SERVICE);
String mac = wm.getConnectionInfo().getMacAddress();
String newMac = mac.substring(0, 2);
mac = mac.substring(2);
int hex = Integer.parseInt(newMac, 16) + 0x2;
newMac = Integer.toHexString(hex);
String text = newMac + mac;
NdefMessage msg = new NdefMessage(NdefRecord.createMime(
"application/com.justbaumdev.tagsense", text.getBytes()));
return msg;
}
/**
* Implementation for the OnNdefPushCompleteCallback interface
*/
@Override
public void onNdefPushComplete(NfcEvent arg0) {
// A handler is needed to send messages to the activity when this
// callback occurs, because it happens from a binder thread
mHandler.obtainMessage(MESSAGE_SENT).sendToTarget();
}
/** This handler receives a message from onNdefPushComplete */
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_SENT:
Toast.makeText(getApplicationContext(), "Message sent!", Toast.LENGTH_LONG).show();
break;
}
}
};
/**
* Parses the NDEF Message from the intent and prints to the TextView
*/
//TODO Currently overwrites any previously saved mac addresses. Get FB ID as value. Auto end activity.
void processIntent(Intent intent) {
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
// only one message sent during the beam
NdefMessage msg = (NdefMessage) rawMsgs[0];
// record 0 contains the MIME type, record 1 is the AAR, if present
//textView.setText(new String(msg.getRecords()[0].getPayload()));
String payload = new String(msg.getRecords()[0].getPayload());
Toast.makeText(this, new String(msg.getRecords()[0].getPayload()), Toast.LENGTH_LONG).show();
SharedPreferences appData = getSharedPreferences("appData", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = appData.edit();
String addresses = appData.getString("mac_address", null);
if(addresses==null)
{
JSONArray addressArray = new JSONArray();
addressArray.put(payload);
addresses = addressArray.toString();
}
else
{
try {
if(!addresses.contains(payload))
{
JSONArray addressArray = new JSONArray(addresses);
addressArray.put(payload);
addresses = addressArray.toString();
}
} catch (JSONException e) {
Toast.makeText(this, "Error adding new friend. Please try again.", Toast.LENGTH_SHORT).show();
}
}
editor.putString("mac_address", addresses);
editor.commit();
}
}
谢谢你的帮助。