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A library jar that provides APIs for Applications written for the Google Android Platform.

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/*
 * Copyright (C) 2010 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 android.nfc.tech;

import android.nfc.ErrorCodes;
import android.nfc.Tag;
import android.os.Bundle;
import android.os.RemoteException;
import android.util.Log;

import java.io.IOException;

/**
 * Provides access to NFC-F (JIS 6319-4) properties and I/O operations on a {@link Tag}.
 *
 * 

Acquire a {@link NfcF} object using {@link #get}. *

The primary NFC-F I/O operation is {@link #transceive}. Applications must * implement their own protocol stack on top of {@link #transceive}. * *

Note: Methods that perform I/O operations * require the {@link android.Manifest.permission#NFC} permission. */ public final class NfcF extends BasicTagTechnology { private static final String TAG = "NFC"; /** @hide */ public static final String EXTRA_SC = "systemcode"; /** @hide */ public static final String EXTRA_PMM = "pmm"; private byte[] mSystemCode = null; private byte[] mManufacturer = null; /** * Get an instance of {@link NfcF} for the given tag. *

Returns null if {@link NfcF} was not enumerated in {@link Tag#getTechList}. * This indicates the tag does not support NFC-F. *

Does not cause any RF activity and does not block. * * @param tag an NFC-F compatible tag * @return NFC-F object */ public static NfcF get(Tag tag) { if (!tag.hasTech(TagTechnology.NFC_F)) return null; try { return new NfcF(tag); } catch (RemoteException e) { return null; } } /** @hide */ public NfcF(Tag tag) throws RemoteException { super(tag, TagTechnology.NFC_F); Bundle extras = tag.getTechExtras(TagTechnology.NFC_F); if (extras != null) { mSystemCode = extras.getByteArray(EXTRA_SC); mManufacturer = extras.getByteArray(EXTRA_PMM); } } /** * Return the System Code bytes from tag discovery. * *

Does not cause any RF activity and does not block. * * @return System Code bytes */ public byte[] getSystemCode() { return mSystemCode; } /** * Return the Manufacturer bytes from tag discovery. * *

Does not cause any RF activity and does not block. * * @return Manufacturer bytes */ public byte[] getManufacturer() { return mManufacturer; } /** * Send raw NFC-F commands to the tag and receive the response. * *

Applications must not append the SoD (length) or EoD (CRC) to the payload, * it will be automatically calculated. * *

Use {@link #getMaxTransceiveLength} to retrieve the maximum amount of bytes * that can be sent with {@link #transceive}. * *

This is an I/O operation and will block until complete. It must * not be called from the main application thread. A blocked call will be canceled with * {@link IOException} if {@link #close} is called from another thread. * *

Requires the {@link android.Manifest.permission#NFC} permission. * * @param data bytes to send * @return bytes received in response * @throws TagLostException if the tag leaves the field * @throws IOException if there is an I/O failure, or this operation is canceled */ public byte[] transceive(byte[] data) throws IOException { return transceive(data, true); } /** * Return the maximum number of bytes that can be sent with {@link #transceive}. * @return the maximum number of bytes that can be sent with {@link #transceive}. */ public int getMaxTransceiveLength() { return getMaxTransceiveLengthInternal(); } /** * Set the {@link #transceive} timeout in milliseconds. * *

The timeout only applies to {@link #transceive} on this object, * and is reset to a default value when {@link #close} is called. * *

Setting a longer timeout may be useful when performing * transactions that require a long processing time on the tag * such as key generation. * *

Requires the {@link android.Manifest.permission#NFC} permission. * * @param timeout timeout value in milliseconds */ public void setTimeout(int timeout) { try { int err = mTag.getTagService().setTimeout(TagTechnology.NFC_F, timeout); if (err != ErrorCodes.SUCCESS) { throw new IllegalArgumentException("The supplied timeout is not valid"); } } catch (RemoteException e) { Log.e(TAG, "NFC service dead", e); } } /** * Get the current {@link #transceive} timeout in milliseconds. * *

Requires the {@link android.Manifest.permission#NFC} permission. * * @return timeout value in milliseconds */ public int getTimeout() { try { return mTag.getTagService().getTimeout(TagTechnology.NFC_F); } catch (RemoteException e) { Log.e(TAG, "NFC service dead", e); return 0; } } }





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