android NFC P2P有关问题_Android

android NFC P2P问题
找到了个 SnepPusher的代码，但只能把数据push到PC，PC回传给手机的没数据么？是什么问题呢？

package it.ismb.nfc.sneppusher;

import java.nio.charset.Charset;

import android.net.Uri;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.NfcAdapter.CreateBeamUrisCallback;
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.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TextView;
import android.widget.Toast;
import android.text.format.Time;

public class SnepPusher extends Activity
implements CreateNdefMessageCallback,
OnNdefPushCompleteCallback,
CreateBeamUrisCallback

{

NfcAdapter mNfcAdapter;
TextView mInfoText;

private final Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
             case 1:
                Toast.makeText(getApplicationContext(), "Message sent!", Toast.LENGTH_LONG).show();
                break;
        }
        }
};

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

        // Check for available NFC Adapter
        mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
        if (mNfcAdapter == null) {
            mInfoText = (TextView) findViewById(R.id.textView3);
            mInfoText.setText("NFC is not available on this device.");
        }

        // Register callback to set NDEF message
        mNfcAdapter.setNdefPushMessageCallback(this, this);
        // Register callback to listen for message-sent success
        mNfcAdapter.setOnNdefPushCompleteCallback(this, this);
        mNfcAdapter.setBeamPushUrisCallback(this, this);
    }

    @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 boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_snep_pusher, menu);
        return true;
    }

@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(1).sendToTarget();
}
//  55 AA 05 12 FF 02 01 00 FF
//  55 AA 05 12 FF 02 00 00 FF
//  55 AA 22 12 FF 05 61 6D 20 6D 65 20 75 70 21 0A 0A 42 65 61 6D 20 54 69 6D 65 3A 20 31 30 3A 33 32 3A 31 32 00 FF
//  55 AA 05 12 FF 02 01 00 FF

@Override
public NdefMessage createNdefMessage(NfcEvent event) {
Time time = new Time();
        time.setToNow();
        String text = ("Beam me up!\n\n" + "Beam Time: " + time.format("%H:%M:%S"));
        NdefMessage msg = new NdefMessage(
                new NdefRecord[] { createMimeRecord(
                        "application/it.ismb.nfc.sneppusher", text.getBytes())});
        return msg;
}

public NdefRecord createMimeRecord(String mimeType, byte[] payload) {
        byte[] mimeBytes = mimeType.getBytes(Charset.forName("US-ASCII"));
        NdefRecord mimeRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, mimeBytes, new byte[0], payload);
        return mimeRecord;
}

void processIntent(Intent intent) {
        Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
        // only one message sent
        NdefMessage msg = (NdefMessage) rawMsgs[0];
        // record 0 contains the MIME type, record 1 is the AAR, if present
        mInfoText.setText(new String(msg.getRecords()[0].getPayload()));
}
@Override
public Uri[] createBeamUris(NfcEvent arg0) {
// TODO Auto-generated method stub
return null;
}

}
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="it.ismb.nfc.sneppusher"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-permission android:name="android.permission.NFC" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <uses-feature android:name="android.hardware.nfc" android:required="true" />
       <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="18" />
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

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

            <intent-filter>
   <action android:name="android.nfc.action.NDEF_DISCOVERED"/>
   <category android:name="android.intent.category.DEFAULT"/>
   <data android:mimeType="application/it.ismb.nfc.sneppusher"/>
</intent-filter>
        </activity>
    </application>

</manifest>
------解决思路----------------------
<data android:mimeType="application/it.ismb.nfc.sneppusher"/> 的问题