| /* |
| * 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.technology; |
| |
| import android.nfc.ErrorCodes; |
| import android.nfc.FormatException; |
| import android.nfc.NdefMessage; |
| import android.nfc.NfcAdapter; |
| import android.nfc.Tag; |
| import android.os.Bundle; |
| import android.os.RemoteException; |
| |
| import java.io.IOException; |
| |
| /** |
| * A high-level connection to a {@link Tag} using one of the NFC type 1, 2, 3, or 4 technologies |
| * to interact with NDEF data. MiFare Classic cards that present NDEF data may also be used |
| * via this class. To determine the exact technology being used call {@link #getTechnologyId()} |
| * |
| * <p>You can acquire this kind of connection with {@link Tag#getTechnology(int)}. |
| * |
| * <p class="note"><strong>Note:</strong> |
| * Use of this class requires the {@link android.Manifest.permission#NFC} |
| * permission. |
| */ |
| public final class Ndef extends BasicTagTechnology { |
| /** @hide */ |
| public static final int NDEF_MODE_READ_ONLY = 1; |
| /** @hide */ |
| public static final int NDEF_MODE_READ_WRITE = 2; |
| /** @hide */ |
| public static final int NDEF_MODE_UNKNOWN = 3; |
| |
| /** @hide */ |
| public static final String EXTRA_NDEF_MSG = "ndefmsg"; |
| |
| /** @hide */ |
| public static final String EXTRA_NDEF_MAXLENGTH = "ndefmaxlength"; |
| |
| /** @hide */ |
| public static final String EXTRA_NDEF_CARDSTATE = "ndefcardstate"; |
| |
| private final int mMaxNdefSize; |
| private final int mCardState; |
| private final NdefMessage mNdefMsg; |
| |
| /** |
| * Internal constructor, to be used by NfcAdapter |
| * @hide |
| */ |
| public Ndef(NfcAdapter adapter, Tag tag, int tech, Bundle extras) throws RemoteException { |
| super(adapter, tag, tech); |
| if (extras != null) { |
| mMaxNdefSize = extras.getInt(EXTRA_NDEF_MAXLENGTH); |
| mCardState = extras.getInt(EXTRA_NDEF_CARDSTATE); |
| mNdefMsg = extras.getParcelable(EXTRA_NDEF_MSG); |
| } else { |
| throw new NullPointerException("NDEF tech extras are null."); |
| } |
| |
| } |
| |
| /** |
| * Get the primary NDEF message on this tag. This data is read at discovery time |
| * and does not require a connection. |
| */ |
| public NdefMessage getCachedNdefMessage() { |
| return mNdefMsg; |
| } |
| |
| /** |
| * Get optional extra NDEF messages. |
| * Some tags may contain extra NDEF messages, but not all |
| * implementations will be able to read them. |
| */ |
| public NdefMessage[] getExtraNdefMessage() throws IOException, FormatException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Get maximum NDEF message size in bytes |
| */ |
| public int getMaxSize() { |
| return mMaxNdefSize; |
| } |
| |
| /** |
| * Provides a hint on whether writes are likely to succeed. |
| * <p>Requires {@link android.Manifest.permission#NFC} permission. |
| * @return true if write is likely to succeed |
| */ |
| public boolean isWritable() { |
| return (mCardState == NDEF_MODE_READ_WRITE); |
| } |
| |
| // Methods that require connect() |
| /** |
| * Get the primary NDEF message on this tag. This data is read actively |
| * and requires a connection. |
| */ |
| public NdefMessage getNdefMessage() throws IOException, FormatException { |
| try { |
| int serviceHandle = mTag.getServiceHandle(); |
| if (mTagService.isNdef(serviceHandle)) { |
| NdefMessage msg = mTagService.ndefRead(serviceHandle); |
| if (msg == null) { |
| int errorCode = mTagService.getLastError(serviceHandle); |
| switch (errorCode) { |
| case ErrorCodes.ERROR_IO: |
| throw new IOException(); |
| case ErrorCodes.ERROR_INVALID_PARAM: |
| throw new FormatException(); |
| default: |
| // Should not happen |
| throw new IOException(); |
| } |
| } |
| return msg; |
| } else { |
| return null; |
| } |
| } catch (RemoteException e) { |
| attemptDeadServiceRecovery(e); |
| return null; |
| } |
| } |
| /** |
| * Overwrite the primary NDEF message |
| * @throws IOException |
| */ |
| public void writeNdefMessage(NdefMessage msg) throws IOException, FormatException { |
| try { |
| int errorCode = mTagService.ndefWrite(mTag.getServiceHandle(), msg); |
| switch (errorCode) { |
| case ErrorCodes.SUCCESS: |
| break; |
| case ErrorCodes.ERROR_IO: |
| throw new IOException(); |
| case ErrorCodes.ERROR_INVALID_PARAM: |
| throw new FormatException(); |
| default: |
| // Should not happen |
| throw new IOException(); |
| } |
| } catch (RemoteException e) { |
| attemptDeadServiceRecovery(e); |
| } |
| } |
| |
| /** |
| * Attempt to write extra NDEF messages. |
| * Implementations may be able to write extra NDEF |
| * message after the first primary message, but it is not |
| * guaranteed. Even if it can be written, other implementations |
| * may not be able to read NDEF messages after the primary message. |
| * It is recommended to use additional NDEF records instead. |
| * |
| * @throws IOException |
| */ |
| public void writeExtraNdefMessage(int i, NdefMessage msg) throws IOException, FormatException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Set the CC field to indicate this tag is read-only |
| * @throws IOException |
| */ |
| public boolean makeReadonly() throws IOException { |
| try { |
| int errorCode = mTagService.ndefMakeReadOnly(mTag.getServiceHandle()); |
| switch (errorCode) { |
| case ErrorCodes.SUCCESS: |
| return true; |
| case ErrorCodes.ERROR_IO: |
| throw new IOException(); |
| case ErrorCodes.ERROR_INVALID_PARAM: |
| return false; |
| default: |
| // Should not happen |
| throw new IOException(); |
| } |
| } catch (RemoteException e) { |
| attemptDeadServiceRecovery(e); |
| return false; |
| } |
| } |
| |
| /** |
| * Attempt to use tag specific technology to really make |
| * the tag read-only |
| * For NFC Forum Type 1 and 2 only. |
| */ |
| public void makeLowLevelReadonly() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public byte[] transceive(byte[] data) { |
| throw new UnsupportedOperationException(); |
| } |
| } |