1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.beam; 18 19 import android.app.Activity; 20 import android.content.Intent; 21 import android.nfc.NdefMessage; 22 import android.nfc.NdefRecord; 23 import android.nfc.NfcAdapter; 24 import android.nfc.NfcAdapter.CreateNdefMessageCallback; 25 import android.nfc.NfcAdapter.OnNdefPushCompleteCallback; 26 import android.nfc.NfcEvent; 27 import android.os.Bundle; 28 import android.os.Handler; 29 import android.os.Message; 30 import android.os.Parcelable; 31 import android.provider.Settings; 32 import android.text.format.Time; 33 import android.view.Menu; 34 import android.view.MenuInflater; 35 import android.view.MenuItem; 36 import android.widget.TextView; 37 import android.widget.Toast; 38 39 import java.nio.charset.Charset; 40 41 42 public class Beam extends Activity implements CreateNdefMessageCallback, 43 OnNdefPushCompleteCallback { 44 NfcAdapter mNfcAdapter; 45 TextView mInfoText; 46 private static final int MESSAGE_SENT = 1; 47 48 @Override 49 public void onCreate(Bundle savedInstanceState) { 50 super.onCreate(savedInstanceState); 51 setContentView(R.layout.main); 52 53 mInfoText = (TextView) findViewById(R.id.textView); 54 // Check for available NFC Adapter 55 mNfcAdapter = NfcAdapter.getDefaultAdapter(this); 56 if (mNfcAdapter == null) { 57 mInfoText = (TextView) findViewById(R.id.textView); 58 mInfoText.setText("NFC is not available on this device."); 59 } 60 // Register callback to set NDEF message 61 mNfcAdapter.setNdefPushMessageCallback(this, this); 62 // Register callback to listen for message-sent success 63 mNfcAdapter.setOnNdefPushCompleteCallback(this, this); 64 } 65 66 67 /** 68 * Implementation for the CreateNdefMessageCallback interface 69 */ 70 @Override 71 public NdefMessage createNdefMessage(NfcEvent event) { 72 Time time = new Time(); 73 time.setToNow(); 74 String text = ("Beam me up!\n\n" + 75 "Beam Time: " + time.format("%H:%M:%S")); 76 NdefMessage msg = new NdefMessage( 77 new NdefRecord[] { createMimeRecord( 78 "application/com.example.android.beam", text.getBytes()) 79 /** 80 * The Android Application Record (AAR) is commented out. When a device 81 * receives a push with an AAR in it, the application specified in the AAR 82 * is guaranteed to run. The AAR overrides the tag dispatch system. 83 * You can add it back in to guarantee that this 84 * activity starts when receiving a beamed message. For now, this code 85 * uses the tag dispatch system. 86 */ 87 //,NdefRecord.createApplicationRecord("com.example.android.beam") 88 }); 89 return msg; 90 } 91 92 /** 93 * Implementation for the OnNdefPushCompleteCallback interface 94 */ 95 @Override 96 public void onNdefPushComplete(NfcEvent arg0) { 97 // A handler is needed to send messages to the activity when this 98 // callback occurs, because it happens from a binder thread 99 mHandler.obtainMessage(MESSAGE_SENT).sendToTarget(); 100 } 101 102 /** This handler receives a message from onNdefPushComplete */ 103 private final Handler mHandler = new Handler() { 104 @Override 105 public void handleMessage(Message msg) { 106 switch (msg.what) { 107 case MESSAGE_SENT: 108 Toast.makeText(getApplicationContext(), "Message sent!", Toast.LENGTH_LONG).show(); 109 break; 110 } 111 } 112 }; 113 114 @Override 115 public void onResume() { 116 super.onResume(); 117 // Check to see that the Activity started due to an Android Beam 118 if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) { 119 processIntent(getIntent()); 120 } 121 } 122 123 @Override 124 public void onNewIntent(Intent intent) { 125 // onResume gets called after this to handle the intent 126 setIntent(intent); 127 } 128 129 /** 130 * Parses the NDEF Message from the intent and prints to the TextView 131 */ 132 void processIntent(Intent intent) { 133 Parcelable[] rawMsgs = intent.getParcelableArrayExtra( 134 NfcAdapter.EXTRA_NDEF_MESSAGES); 135 // only one message sent during the beam 136 NdefMessage msg = (NdefMessage) rawMsgs[0]; 137 // record 0 contains the MIME type, record 1 is the AAR, if present 138 mInfoText.setText(new String(msg.getRecords()[0].getPayload())); 139 } 140 141 /** 142 * Creates a custom MIME type encapsulated in an NDEF record 143 * 144 * @param mimeType 145 */ 146 public NdefRecord createMimeRecord(String mimeType, byte[] payload) { 147 byte[] mimeBytes = mimeType.getBytes(Charset.forName("US-ASCII")); 148 NdefRecord mimeRecord = new NdefRecord( 149 NdefRecord.TNF_MIME_MEDIA, mimeBytes, new byte[0], payload); 150 return mimeRecord; 151 } 152 153 @Override 154 public boolean onCreateOptionsMenu(Menu menu) { 155 // If NFC is not available, we won't be needing this menu 156 if (mNfcAdapter == null) { 157 return super.onCreateOptionsMenu(menu); 158 } 159 MenuInflater inflater = getMenuInflater(); 160 inflater.inflate(R.menu.options, menu); 161 return true; 162 } 163 164 @Override 165 public boolean onOptionsItemSelected(MenuItem item) { 166 switch (item.getItemId()) { 167 case R.id.menu_settings: 168 Intent intent = new Intent(Settings.ACTION_NFCSHARING_SETTINGS); 169 startActivity(intent); 170 return true; 171 default: 172 return super.onOptionsItemSelected(item); 173 } 174 } 175 } 176
