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Diffstat (limited to 'core/java/android/nfc/tech/NfcA.java')
-rw-r--r-- | core/java/android/nfc/tech/NfcA.java | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/core/java/android/nfc/tech/NfcA.java b/core/java/android/nfc/tech/NfcA.java new file mode 100644 index 0000000..24badc4 --- /dev/null +++ b/core/java/android/nfc/tech/NfcA.java @@ -0,0 +1,99 @@ +/* + * 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; + +/** + * A low-level connection to a {@link Tag} using the NFC-A technology, also known as + * ISO1443-3A. + * + * <p>You can acquire this kind of connection with {@link #get}. + * Use this class to send and receive data with {@link #transceive transceive()}. + * + * <p>Applications must implement their own protocol stack on top of + * {@link #transceive transceive()}. + * + * <p class="note"><strong>Note:</strong> + * Use of this class requires the {@link android.Manifest.permission#NFC} + * permission. + */ +public final class NfcA extends BasicTagTechnology { + /** @hide */ + public static final String EXTRA_SAK = "sak"; + /** @hide */ + public static final String EXTRA_ATQA = "atqa"; + + private short mSak; + private byte[] mAtqa; + + /** + * Returns an instance of this tech for the given tag. If the tag doesn't support + * this tech type null is returned. + * + * @param tag The tag to get the tech from + */ + public static NfcA get(Tag tag) { + if (!tag.hasTech(TagTechnology.NFC_A)) return null; + try { + return new NfcA(tag); + } catch (RemoteException e) { + return null; + } + } + + /** @hide */ + public NfcA(Tag tag) throws RemoteException { + super(tag, TagTechnology.NFC_A); + Bundle extras = tag.getTechExtras(TagTechnology.NFC_A); + mSak = extras.getShort(EXTRA_SAK); + mAtqa = extras.getByteArray(EXTRA_ATQA); + } + + /** + * Returns the ATQA/SENS_RES bytes discovered at tag discovery. + */ + public byte[] getAtqa() { + return mAtqa; + } + + /** + * Returns the SAK/SEL_RES discovered at tag discovery. + */ + public short getSak() { + return mSak; + } + + /** + * Send data to a tag and receive the response. + * <p> + * This method will block until the response is received. It can be canceled + * with {@link #close}. + * <p>Requires {@link android.Manifest.permission#NFC} permission. + * + * @param data bytes to send + * @return bytes received in response + * @throws IOException if the target is lost or connection closed + */ + public byte[] transceive(byte[] data) throws IOException { + return transceive(data, true); + } +} |