| /* |
| * 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.Tag; |
| import android.os.Bundle; |
| import android.os.RemoteException; |
| |
| import java.io.IOException; |
| |
| /** |
| * Provides access to NFC-V (ISO 15693) properties and I/O operations on a {@link Tag}. |
| * |
| * <p>Acquire a {@link NfcV} object using {@link #get}. |
| * <p>The primary NFC-V I/O operation is {@link #transceive}. Applications must |
| * implement their own protocol stack on top of {@link #transceive}. |
| * |
| * <p class="note"><strong>Note:</strong> Methods that perform I/O operations |
| * require the {@link android.Manifest.permission#NFC} permission. |
| */ |
| public final class NfcV extends BasicTagTechnology { |
| /** @hide */ |
| public static final String EXTRA_RESP_FLAGS = "respflags"; |
| |
| /** @hide */ |
| public static final String EXTRA_DSFID = "dsfid"; |
| |
| private byte mRespFlags; |
| private byte mDsfId; |
| |
| /** |
| * Get an instance of {@link NfcV} for the given tag. |
| * <p>Returns null if {@link NfcV} was not enumerated in {@link Tag#getTechList}. |
| * This indicates the tag does not support NFC-V. |
| * <p>Does not cause any RF activity and does not block. |
| * |
| * @param tag an NFC-V compatible tag |
| * @return NFC-V object |
| */ |
| public static NfcV get(Tag tag) { |
| if (!tag.hasTech(TagTechnology.NFC_V)) return null; |
| try { |
| return new NfcV(tag); |
| } catch (RemoteException e) { |
| return null; |
| } |
| } |
| |
| /** @hide */ |
| public NfcV(Tag tag) throws RemoteException { |
| super(tag, TagTechnology.NFC_V); |
| Bundle extras = tag.getTechExtras(TagTechnology.NFC_V); |
| mRespFlags = extras.getByte(EXTRA_RESP_FLAGS); |
| mDsfId = extras.getByte(EXTRA_DSFID); |
| } |
| |
| /** |
| * Return the Response Flag bytes from tag discovery. |
| * |
| * <p>Does not cause any RF activity and does not block. |
| * |
| * @return Response Flag bytes |
| */ |
| public byte getResponseFlags() { |
| return mRespFlags; |
| } |
| |
| /** |
| * Return the DSF ID bytes from tag discovery. |
| * |
| * <p>Does not cause any RF activity and does not block. |
| * |
| * @return DSF ID bytes |
| */ |
| public byte getDsfId() { |
| return mDsfId; |
| } |
| |
| /** |
| * Send raw NFC-V commands to the tag and receive the response. |
| * |
| * <p>Applications must not append the CRC to the payload, |
| * it will be automatically calculated. The application does |
| * provide FLAGS, CMD and PARAMETER bytes. |
| * |
| * <p>Use {@link #getMaxTransceiveLength} to retrieve the maximum amount of bytes |
| * that can be sent with {@link #transceive}. |
| * |
| * <p>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. |
| * |
| * <p class="note">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(); |
| } |
| } |