我正在为 NFC 和意图而苦苦挣扎，我可以发现标签，但我如何从它们中读取信息？
正如代码所示：我得到带有意图的发现标签：Intent { act= android.nfc.action TECH_DISCOVERED flg=0x13400000 cmp=com.example.android.apid/.nfc。技术过滤器（有额外的）}
我想从标签中获取信息，我应该解析字节等吗？
最佳注册 h。
/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
package com.example.android.apis.nfc;
import java.util.List;
import com.example.android.apis.R;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentFilter.MalformedMimeTypeException;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.NfcF;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
/**
* An example of how to use the NFC foreground dispatch APIs. This will intercept any MIME data
* based NDEF dispatch as well as all dispatched for NfcF tags.
*/
public class ForegroundDispatch extends Activity {
//StringBuilder detailsRead = new StringBuilder();
private NfcAdapter mAdapter;
private PendingIntent mPendingIntent;
private IntentFilter[] mFilters;
private String[][] mTechLists;
private TextView mText;
private int mCount = 0;
static final String TAG = "TagReadActivity";
@Override
public void onCreate(Bundle savedState) {
super.onCreate(savedState);
setContentView(R.layout.foreground_dispatch);
mText = (TextView) findViewById(R.id.text);
//resolveIntent(getIntent());
mText.setText("Scan a tag");
mAdapter = NfcAdapter.getDefaultAdapter(this);
// Create a generic PendingIntent that will be deliver to this activity. The NFC stack
// will fill in the intent with the details of the discovered tag before delivering to
// this activity.
mPendingIntent = PendingIntent.getActivity(this, 0,
new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
// Setup an intent filter for all MIME based dispatches
IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
try {
ndef.addDataType("*/*");
} catch (MalformedMimeTypeException e) {
throw new RuntimeException("fail", e);
}
mFilters = new IntentFilter[] {
ndef,
};
// Setup a tech list for all NfcF tags
mTechLists = new String[][] { new String[] { NfcF.class.getName() } };
}
/**
void resolveIntent(Intent intent) {
// TODO Auto-generated method stub
String action = intent.getAction();
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)) {
// When a tag is discovered we send it to the service to be save. We
// include a PendingIntent for the service to call back onto. This
// will cause this activity to be restarted with onNewIntent(). At
// that time we read it from the database and view it.
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage[] msgs;
if (rawMsgs != null) {
msgs = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) {
msgs[i] = (NdefMessage) rawMsgs[i];
}
} else {
// Unknown tag type
byte[] empty = new byte[] {};
NdefRecord record = new NdefRecord(NdefRecord.TNF_UNKNOWN, empty, empty, empty);
NdefMessage msg = new NdefMessage(new NdefRecord[] {record});
msgs = new NdefMessage[] {msg};
}
// Setup the views
} else {
Log.e(TAG, "Unknown intent " + intent);
mText.setText("My thing going on " + ++mCount + " with intent: " + action);
finish();
return;
}
}
**/
@Override
public void onResume() {
super.onResume();
mAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters, mTechLists);
}
@Override
public void onNewIntent(Intent intent) {
Log.i("Foreground dispatch", "Discovered tag with intent: " + intent);
mText.setText("Discovered tag " + ++mCount + " with intent: " + intent);
}
@Override
public void onPause() {
super.onPause();
mAdapter.disableForegroundDispatch(this);
}
}