| /* |
| * 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.beam; |
| |
| import android.app.Activity; |
| import android.content.Intent; |
| import android.nfc.NdefMessage; |
| import android.nfc.NdefRecord; |
| import android.nfc.NfcAdapter; |
| import android.nfc.NfcAdapter.CreateNdefMessageCallback; |
| import android.nfc.NfcEvent; |
| import android.os.Bundle; |
| import android.os.Parcelable; |
| import android.widget.TextView; |
| import android.widget.Toast; |
| import java.nio.charset.Charset; |
| |
| |
| public class Beam extends Activity implements CreateNdefMessageCallback { |
| NfcAdapter mNfcAdapter; |
| TextView textView; |
| |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.main); |
| TextView textView = (TextView) findViewById(R.id.textView); |
| // Check for available NFC Adapter |
| mNfcAdapter = NfcAdapter.getDefaultAdapter(this); |
| if (mNfcAdapter == null) { |
| Toast.makeText(this, "NFC is not available", Toast.LENGTH_LONG).show(); |
| finish(); |
| return; |
| } |
| // Register callback |
| mNfcAdapter.setNdefPushMessageCallback(this, this); |
| } |
| |
| @Override |
| public NdefMessage createNdefMessage(NfcEvent event) { |
| String text = ("Beam me up, Android!\n\n" + |
| "Beam Time: " + System.currentTimeMillis()); |
| NdefMessage msg = new NdefMessage( |
| new NdefRecord[] { createMimeRecord( |
| "application/com.example.android.beam", text.getBytes()) |
| /** |
| * The Android Application Record (AAR) is commented out. When a device |
| * receives a push with an AAR in it, the application specified in the AAR |
| * is guaranteed to run. The AAR overrides the tag dispatch system. |
| * You can add it back in to guarantee that this |
| * activity starts when receiving a beamed message. For now, this code |
| * uses the tag dispatch system. |
| */ |
| //,NdefRecord.createApplicationRecord("com.example.android.beam") |
| }); |
| return msg; |
| } |
| |
| @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); |
| } |
| |
| /** |
| * Parses the NDEF Message from the intent and prints to the TextView |
| */ |
| void processIntent(Intent intent) { |
| textView = (TextView) findViewById(R.id.textView); |
| 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())); |
| } |
| |
| /** |
| * Creates a custom MIME type encapsulated in an NDEF record |
| * |
| * @param mimeType |
| */ |
| 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; |
| } |
| } |