An example of how to use the NFC foreground NDEF push APIs. : NfcAdapter « Core Class « Android

1. Android
2. Core Class
3. NfcAdapter

An example of how to use the NFC foreground NDEF push APIs.

   
/*
 * 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

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2007 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.
-->

<TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/text"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    android:gravity="center_vertical|center_horizontal"
    android:textAppearance="?android:attr/textAppearanceMedium"
/>

   
    
    
  

Related examples in the same category