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.apis.nfc; 18 19 import com.example.android.apis.R; 20 21 import android.app.Activity; 22 import android.nfc.NdefMessage; 23 import android.nfc.NdefRecord; 24 import android.nfc.NfcAdapter; 25 import android.os.Bundle; 26 import android.widget.TextView; 27 28 import java.nio.charset.Charset; 29 import java.util.Locale; 30 31 /** 32 * An example of how to use the NFC foreground NDEF push APIs. 33 */ 34 public class ForegroundNdefPush extends Activity { 35 private NfcAdapter mAdapter; 36 private TextView mText; 37 private NdefMessage mMessage; 38 newTextRecord(String text, Locale locale, boolean encodeInUtf8)39 public static NdefRecord newTextRecord(String text, Locale locale, boolean encodeInUtf8) { 40 byte[] langBytes = locale.getLanguage().getBytes(Charset.forName("US-ASCII")); 41 42 Charset utfEncoding = encodeInUtf8 ? Charset.forName("UTF-8") : Charset.forName("UTF-16"); 43 byte[] textBytes = text.getBytes(utfEncoding); 44 45 int utfBit = encodeInUtf8 ? 0 : (1 << 7); 46 char status = (char) (utfBit + langBytes.length); 47 48 byte[] data = new byte[1 + langBytes.length + textBytes.length]; 49 data[0] = (byte) status; 50 System.arraycopy(langBytes, 0, data, 1, langBytes.length); 51 System.arraycopy(textBytes, 0, data, 1 + langBytes.length, textBytes.length); 52 53 return new NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_TEXT, new byte[0], data); 54 } 55 56 @Override onCreate(Bundle savedState)57 public void onCreate(Bundle savedState) { 58 super.onCreate(savedState); 59 60 mAdapter = NfcAdapter.getDefaultAdapter(this); 61 62 setContentView(R.layout.foreground_dispatch); 63 mText = (TextView) findViewById(R.id.text); 64 if (mAdapter != null) { 65 mText.setText("Tap another Android phone with NFC to push 'NDEF Push Sample'"); 66 } else { 67 mText.setText("This phone is not NFC enabled."); 68 } 69 70 // Create an NDEF message with some sample text 71 mMessage = new NdefMessage( 72 new NdefRecord[] { newTextRecord("NDEF Push Sample", Locale.ENGLISH, true)}); 73 } 74 75 @Override onResume()76 public void onResume() { 77 super.onResume(); 78 if (mAdapter != null) mAdapter.enableForegroundNdefPush(this, mMessage); 79 } 80 81 @Override onPause()82 public void onPause() { 83 super.onPause(); 84 if (mAdapter != null) mAdapter.disableForegroundNdefPush(this); 85 } 86 } 87