/*
* 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 com.example.android.apis.R;
import android.app.Activity;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.os.Bundle;
import android.widget.TextView;
import java.nio.charset.Charset;
import java.util.Locale;
/**
* An example of how to use the NFC foreground NDEF push APIs.
*/
public class ForegroundNdefPush extends Activity {
private NfcAdapter mAdapter;
private TextView mText;
private NdefMessage mMessage;
public static NdefRecord newTextRecord(String text, Locale locale, boolean encodeInUtf8) {
byte[] langBytes = locale.getLanguage().getBytes(Charset.forName("US-ASCII"));
Charset utfEncoding = encodeInUtf8 ? Charset.forName("UTF-8") : Charset.forName("UTF-16");
byte[] textBytes = text.getBytes(utfEncoding);
int utfBit = encodeInUtf8 ? 0 : (1 << 7);
char status = (char) (utfBit + langBytes.length);
byte[] data = new byte[1 + langBytes.length + textBytes.length];
data[0] = (byte) status;
System.arraycopy(langBytes, 0, data, 1, langBytes.length);
System.arraycopy(textBytes, 0, data, 1 + langBytes.length, textBytes.length);
return new NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_TEXT, new byte[0], data);
}
@Override
public void onCreate(Bundle savedState) {
super.onCreate(savedState);
mAdapter = NfcAdapter.getDefaultAdapter(this);
setContentView(R.layout.main);
mText = (TextView) findViewById(R.id.text);
if (mAdapter != null) {
mText.setText("Tap another Android phone with NFC to push 'NDEF Push Sample'");
} else {
mText.setText("This phone is not NFC enabled.");
}
// Create an NDEF message with some sample text
mMessage = new NdefMessage(
new NdefRecord[] { newTextRecord("NDEF Push Sample", Locale.ENGLISH, true)});
}
@Override
public void onResume() {
super.onResume();
if (mAdapter != null) mAdapter.enableForegroundNdefPush(this, mMessage);
}
@Override
public void onPause() {
super.onPause();
if (mAdapter != null) mAdapter.disableForegroundNdefPush(this);
}
}
//main.xml
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical|center_horizontal"
android:textAppearance="?android:attr/textAppearanceMedium"
/>