| /* |
| * Copyright (C) 2011 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 com.android.nfc_extras; |
| |
| import android.annotation.SdkConstant; |
| import android.annotation.SdkConstant.SdkConstantType; |
| import android.nfc.INfcAdapterExtras; |
| import android.nfc.NfcAdapter; |
| import android.os.RemoteException; |
| import android.util.Log; |
| |
| /** |
| * Provides additional methods on an {@link NfcAdapter} for Card Emulation |
| * and management of {@link NfcExecutionEnvironment}'s. |
| * |
| * There is a 1-1 relationship between an {@link NfcAdapterExtras} object and |
| * a {@link NfcAdapter} object. |
| */ |
| public final class NfcAdapterExtras { |
| private static final String TAG = "NfcAdapterExtras"; |
| |
| /** |
| * Broadcast Action: an RF field ON has been detected. |
| * |
| * <p class="note">This is an unreliable signal, and will be removed. |
| * <p class="note"> |
| * Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission |
| * to receive. |
| */ |
| public static final String ACTION_RF_FIELD_ON_DETECTED = |
| "com.android.nfc_extras.action.RF_FIELD_ON_DETECTED"; |
| |
| /** |
| * Broadcast Action: an RF field OFF has been detected. |
| * |
| * <p class="note">This is an unreliable signal, and will be removed. |
| * <p class="note"> |
| * Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission |
| * to receive. |
| */ |
| public static final String ACTION_RF_FIELD_OFF_DETECTED = |
| "com.android.nfc_extras.action.RF_FIELD_OFF_DETECTED"; |
| |
| // protected by NfcAdapterExtras.class, and final after first construction, |
| // except for attemptDeadServiceRecovery() when NFC crashes - we accept a |
| // best effort recovery |
| private static NfcAdapter sAdapter; |
| private static INfcAdapterExtras sService; |
| private static NfcAdapterExtras sSingleton; |
| private static NfcExecutionEnvironment sEmbeddedEe; |
| private static CardEmulationRoute sRouteOff; |
| private static CardEmulationRoute sRouteOnWhenScreenOn; |
| |
| /** get service handles */ |
| private static void initService() { |
| final INfcAdapterExtras service = sAdapter.getNfcAdapterExtrasInterface(); |
| if (service != null) { |
| // Leave stale rather than receive a null value. |
| sService = service; |
| } |
| } |
| |
| /** |
| * Get the {@link NfcAdapterExtras} for the given {@link NfcAdapter}. |
| * |
| * <p class="note"> |
| * Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission. |
| * |
| * @param adapter a {@link NfcAdapter}, must not be null |
| * @return the {@link NfcAdapterExtras} object for the given {@link NfcAdapter} |
| */ |
| public static NfcAdapterExtras get(NfcAdapter adapter) { |
| synchronized(NfcAdapterExtras.class) { |
| if (sSingleton == null) { |
| try { |
| sAdapter = adapter; |
| sSingleton = new NfcAdapterExtras(); |
| sEmbeddedEe = new NfcExecutionEnvironment(sSingleton); |
| sRouteOff = new CardEmulationRoute(CardEmulationRoute.ROUTE_OFF, null); |
| sRouteOnWhenScreenOn = new CardEmulationRoute( |
| CardEmulationRoute.ROUTE_ON_WHEN_SCREEN_ON, sEmbeddedEe); |
| initService(); |
| } finally { |
| if (sService == null) { |
| sRouteOnWhenScreenOn = null; |
| sRouteOff = null; |
| sEmbeddedEe = null; |
| sSingleton = null; |
| sAdapter = null; |
| } |
| } |
| } |
| return sSingleton; |
| } |
| } |
| |
| private NfcAdapterExtras() {} |
| |
| /** |
| * Immutable data class that describes a card emulation route. |
| */ |
| public final static class CardEmulationRoute { |
| /** |
| * Card Emulation is turned off on this NfcAdapter. |
| * <p>This is the default routing state after boot. |
| */ |
| public static final int ROUTE_OFF = 1; |
| |
| /** |
| * Card Emulation is routed to {@link #nfcEe} only when the screen is on, |
| * otherwise it is turned off. |
| */ |
| public static final int ROUTE_ON_WHEN_SCREEN_ON = 2; |
| |
| /** |
| * A route such as {@link #ROUTE_OFF} or {@link #ROUTE_ON_WHEN_SCREEN_ON}. |
| */ |
| public final int route; |
| |
| /** |
| * The {@link NFcExecutionEnvironment} that is Card Emulation is routed to. |
| * <p>null if {@link #route} is {@link #ROUTE_OFF}, otherwise not null. |
| */ |
| public final NfcExecutionEnvironment nfcEe; |
| |
| public CardEmulationRoute(int route, NfcExecutionEnvironment nfcEe) { |
| if (route == ROUTE_OFF && nfcEe != null) { |
| throw new IllegalArgumentException("must not specifiy a NFC-EE with ROUTE_OFF"); |
| } else if (route != ROUTE_OFF && nfcEe == null) { |
| throw new IllegalArgumentException("must specifiy a NFC-EE for this route"); |
| } |
| this.route = route; |
| this.nfcEe = nfcEe; |
| } |
| } |
| |
| /** |
| * NFC service dead - attempt best effort recovery |
| */ |
| void attemptDeadServiceRecovery(Exception e) { |
| Log.e(TAG, "NFC Adapter Extras dead - attempting to recover"); |
| sAdapter.attemptDeadServiceRecovery(e); |
| initService(); |
| } |
| |
| INfcAdapterExtras getService() { |
| return sService; |
| } |
| |
| /** |
| * Get the routing state of this NFC EE. |
| * |
| * <p class="note"> |
| * Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission. |
| * |
| * @return |
| */ |
| public CardEmulationRoute getCardEmulationRoute() { |
| try { |
| int route = sService.getCardEmulationRoute(); |
| return route == CardEmulationRoute.ROUTE_OFF ? |
| sRouteOff : |
| sRouteOnWhenScreenOn; |
| } catch (RemoteException e) { |
| attemptDeadServiceRecovery(e); |
| return sRouteOff; |
| } |
| } |
| |
| /** |
| * Set the routing state of this NFC EE. |
| * |
| * <p>This routing state is not persisted across reboot. |
| * |
| * <p class="note"> |
| * Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission. |
| * |
| * @param route a {@link #CardEmulationRoute} |
| */ |
| public void setCardEmulationRoute(CardEmulationRoute route) { |
| try { |
| sService.setCardEmulationRoute(route.route); |
| } catch (RemoteException e) { |
| attemptDeadServiceRecovery(e); |
| } |
| } |
| |
| /** |
| * Get the {@link NfcExecutionEnvironment} that is embedded with the |
| * {@link NFcAdapter}. |
| * |
| * <p class="note"> |
| * Requires the {@link android.Manifest.permission#WRITE_SECURE_SETTINGS} permission. |
| * |
| * @return a {@link NfcExecutionEnvironment}, or null if there is no embedded NFC-EE |
| */ |
| public NfcExecutionEnvironment getEmbeddedExecutionEnvironment() { |
| return sEmbeddedEe; |
| } |
| |
| /** |
| * Authenticate the client application. |
| * |
| * Some implementations of NFC Adapter Extras may require applications |
| * to authenticate with a token, before using other methods. |
| * |
| * @param a implementation specific token |
| * @throws a {@link java.lang.SecurityException} if authentication failed |
| */ |
| public void authenticate(byte[] token) { |
| try { |
| sService.authenticate(token); |
| } catch (RemoteException e) { |
| attemptDeadServiceRecovery(e); |
| } |
| } |
| } |