Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2013 Gerhard Klostermeier
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.Arrays;

import android.content.Context;
import android.content.Intent;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.MifareClassic;

public class Main {
    /**
     * The last detected tag. Set by {@link #treatAsNewTag(android.content.Intent, android.content.Context)}
     */
    private static Tag mTag = null;
    /**
     * The last detected UID. Set by {@link #treatAsNewTag(android.content.Intent, android.content.Context)}
     */
    private static byte[] mUID = null;

    /**
     * For Activities which want to treat new Intents as Intents with a new Tag attached. If the given Intent has a Tag extra, the {@link #mTag} and
     * {@link #mUID} will be updated and a Toast message will be shown in the calling Context (Activity). This method will also check if the
     * device/tag supports Mifare Classic (see return values).
     * 
     * @param intent The Intent which should be checked for a new Tag.
     * @param context The Context in which the Toast will be shown.
     * @return <ul>
     *         <li>1 - The device/tag supports Mifare Classic</li>
     *         <li>0 - The device/tag does not support Mifare Classic</li>
     *         <li>-1 - Wrong Intent (action is not "ACTION_TECH_DISCOVERED").</li>
     *         </ul>
     * @see #mTag
     * @see #mUID
     */
    public static int treatAsNewTag(Intent intent, Context context) {
        // Check if Intent has a NFC Tag.
        if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())) {
            Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
            mTag = tag;
            mUID = tag.getId();

            // Show Toast message with UID.
            //         String id = " (UID: ";
            //         id += byte2HexString(tag.getId());
            //         id += ")";
            //         Toast.makeText(context, id, Toast.LENGTH_LONG).show();

            // Return "1" if device supports Mifare Classic. "0" otherwise.
            return (Arrays.asList(tag.getTechList()).contains(MifareClassic.class.getName())) ? 1 : 0;
        }
        return -1;
    }
}