126 lines
4.3 KiB
Java
126 lines
4.3 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.nfc.tech;
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import android.nfc.Tag;
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import android.os.Bundle;
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import android.os.RemoteException;
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import java.io.IOException;
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/**
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* Provides access to NFC-B (ISO 14443-3B) properties and I/O operations on a {@link Tag}.
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*
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* <p>Acquire a {@link NfcB} object using {@link #get}.
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* <p>The primary NFC-B I/O operation is {@link #transceive}. Applications must
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* implement their own protocol stack on top of {@link #transceive}.
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*
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* <p class="note"><strong>Note:</strong> Methods that perform I/O operations
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* require the {@link android.Manifest.permission#NFC} permission.
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*/
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public final class NfcB extends BasicTagTechnology {
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/** @hide */
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public static final String EXTRA_APPDATA = "appdata";
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/** @hide */
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public static final String EXTRA_PROTINFO = "protinfo";
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private byte[] mAppData;
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private byte[] mProtInfo;
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/**
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* Get an instance of {@link NfcB} for the given tag.
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* <p>Returns null if {@link NfcB} was not enumerated in {@link Tag#getTechList}.
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* This indicates the tag does not support NFC-B.
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* <p>Does not cause any RF activity and does not block.
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*
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* @param tag an NFC-B compatible tag
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* @return NFC-B object
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*/
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public static NfcB get(Tag tag) {
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if (!tag.hasTech(TagTechnology.NFC_B)) return null;
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try {
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return new NfcB(tag);
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} catch (RemoteException e) {
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return null;
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}
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}
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/** @hide */
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public NfcB(Tag tag) throws RemoteException {
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super(tag, TagTechnology.NFC_B);
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Bundle extras = tag.getTechExtras(TagTechnology.NFC_B);
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mAppData = extras.getByteArray(EXTRA_APPDATA);
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mProtInfo = extras.getByteArray(EXTRA_PROTINFO);
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}
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/**
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* Return the Application Data bytes from ATQB/SENSB_RES at tag discovery.
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*
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* <p>Does not cause any RF activity and does not block.
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*
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* @return Application Data bytes from ATQB/SENSB_RES bytes
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*/
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public byte[] getApplicationData() {
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return mAppData;
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}
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/**
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* Return the Protocol Info bytes from ATQB/SENSB_RES at tag discovery.
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*
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* <p>Does not cause any RF activity and does not block.
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*
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* @return Protocol Info bytes from ATQB/SENSB_RES bytes
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*/
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public byte[] getProtocolInfo() {
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return mProtInfo;
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}
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/**
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* Send raw NFC-B commands to the tag and receive the response.
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*
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* <p>Applications must not append the EoD (CRC) to the payload,
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* it will be automatically calculated.
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* <p>Applications must not send commands that manage the polling
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* loop and initialization (SENSB_REQ, SLOT_MARKER etc).
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*
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* <p>Use {@link #getMaxTransceiveLength} to retrieve the maximum number of bytes
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* that can be sent with {@link #transceive}.
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*
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* <p>This is an I/O operation and will block until complete. It must
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* not be called from the main application thread. A blocked call will be canceled with
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* {@link IOException} if {@link #close} is called from another thread.
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*
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* <p class="note">Requires the {@link android.Manifest.permission#NFC} permission.
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*
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* @param data bytes to send
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* @return bytes received in response
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* @throws TagLostException if the tag leaves the field
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* @throws IOException if there is an I/O failure, or this operation is canceled
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*/
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public byte[] transceive(byte[] data) throws IOException {
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return transceive(data, true);
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}
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/**
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* Return the maximum number of bytes that can be sent with {@link #transceive}.
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* @return the maximum number of bytes that can be sent with {@link #transceive}.
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*/
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public int getMaxTransceiveLength() {
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return getMaxTransceiveLengthInternal();
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}
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}
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