Implementation of Dedicated card mode APIs changes (8802f871) · Commits · e / os / android_frameworks_base

core/api/current.txt

+9 −0

Original line number	Original line	Diff line number	Diff line
	@@ -29120,6 +29120,8 @@ package android.nfc {
	method @FlaggedApi("android.nfc.enable_nfc_reader_option") public boolean isReaderOptionSupported();		method @FlaggedApi("android.nfc.enable_nfc_reader_option") public boolean isReaderOptionSupported();
	method public boolean isSecureNfcEnabled();		method public boolean isSecureNfcEnabled();
	method public boolean isSecureNfcSupported();		method public boolean isSecureNfcSupported();
			method @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public void resetDiscoveryTechnology(@NonNull android.app.Activity);
			method @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public void setDiscoveryTechnology(@NonNull android.app.Activity, int, int);
	field public static final String ACTION_ADAPTER_STATE_CHANGED = "android.nfc.action.ADAPTER_STATE_CHANGED";		field public static final String ACTION_ADAPTER_STATE_CHANGED = "android.nfc.action.ADAPTER_STATE_CHANGED";
	field public static final String ACTION_NDEF_DISCOVERED = "android.nfc.action.NDEF_DISCOVERED";		field public static final String ACTION_NDEF_DISCOVERED = "android.nfc.action.NDEF_DISCOVERED";
	field @RequiresPermission(android.Manifest.permission.NFC_PREFERRED_PAYMENT_INFO) public static final String ACTION_PREFERRED_PAYMENT_CHANGED = "android.nfc.action.PREFERRED_PAYMENT_CHANGED";		field @RequiresPermission(android.Manifest.permission.NFC_PREFERRED_PAYMENT_INFO) public static final String ACTION_PREFERRED_PAYMENT_CHANGED = "android.nfc.action.PREFERRED_PAYMENT_CHANGED";
	@@ -29135,6 +29137,13 @@ package android.nfc {
	field public static final String EXTRA_READER_PRESENCE_CHECK_DELAY = "presence";		field public static final String EXTRA_READER_PRESENCE_CHECK_DELAY = "presence";
	field public static final String EXTRA_SECURE_ELEMENT_NAME = "android.nfc.extra.SECURE_ELEMENT_NAME";		field public static final String EXTRA_SECURE_ELEMENT_NAME = "android.nfc.extra.SECURE_ELEMENT_NAME";
	field public static final String EXTRA_TAG = "android.nfc.extra.TAG";		field public static final String EXTRA_TAG = "android.nfc.extra.TAG";
			field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_DISABLE = 0; // 0x0
			field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_KEEP = -1; // 0xffffffff
			field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_NFC_PASSIVE_A = 1; // 0x1
			field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_NFC_PASSIVE_B = 2; // 0x2
			field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_LISTEN_NFC_PASSIVE_F = 4; // 0x4
			field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_READER_DISABLE = 0; // 0x0
			field @FlaggedApi("android.nfc.enable_nfc_set_discovery_tech") public static final int FLAG_READER_KEEP = -1; // 0xffffffff
	field public static final int FLAG_READER_NFC_A = 1; // 0x1		field public static final int FLAG_READER_NFC_A = 1; // 0x1
	field public static final int FLAG_READER_NFC_B = 2; // 0x2		field public static final int FLAG_READER_NFC_B = 2; // 0x2
	field public static final int FLAG_READER_NFC_BARCODE = 16; // 0x10		field public static final int FLAG_READER_NFC_BARCODE = 16; // 0x10

core/java/android/nfc/INfcAdapter.aidl

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -86,4 +86,5 @@ interface INfcAdapter
	boolean enableReaderOption(boolean enable);		boolean enableReaderOption(boolean enable);
	boolean isObserveModeSupported();		boolean isObserveModeSupported();
	boolean setObserveMode(boolean enabled);		boolean setObserveMode(boolean enabled);
			void updateDiscoveryTechnology(IBinder b, int pollFlags, int listenFlags);
	}		}

core/java/android/nfc/INfcCardEmulation.aidl

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -43,4 +43,7 @@ interface INfcCardEmulation
	ApduServiceInfo getPreferredPaymentService(int userHandle);		ApduServiceInfo getPreferredPaymentService(int userHandle);
	boolean setServiceEnabledForCategoryOther(int userHandle, in ComponentName app, boolean status);		boolean setServiceEnabledForCategoryOther(int userHandle, in ComponentName app, boolean status);
	boolean isDefaultPaymentRegistered();		boolean isDefaultPaymentRegistered();

			boolean overrideRoutingTable(int userHandle, String protocol, String technology);
			boolean recoverRoutingTable(int userHandle);
	}		}

core/java/android/nfc/NfcActivityManager.java

+74 −0

Original line number	Original line	Diff line number	Diff line
	@@ -112,6 +112,9 @@ public final class NfcActivityManager extends IAppCallback.Stub
	Bundle readerModeExtras = null;		Bundle readerModeExtras = null;
	Binder token;		Binder token;

			int mPollTech = NfcAdapter.FLAG_USE_ALL_TECH;
			int mListenTech = NfcAdapter.FLAG_USE_ALL_TECH;

	public NfcActivityState(Activity activity) {		public NfcActivityState(Activity activity) {
	if (activity.isDestroyed()) {		if (activity.isDestroyed()) {
	throw new IllegalStateException("activity is already destroyed");		throw new IllegalStateException("activity is already destroyed");
	@@ -132,6 +135,9 @@ public final class NfcActivityManager extends IAppCallback.Stub
	readerModeFlags = 0;		readerModeFlags = 0;
	readerModeExtras = null;		readerModeExtras = null;
	token = null;		token = null;

			mPollTech = NfcAdapter.FLAG_USE_ALL_TECH;
			mListenTech = NfcAdapter.FLAG_USE_ALL_TECH;
	}		}
	@Override		@Override
	public String toString() {		public String toString() {
	@@ -278,6 +284,9 @@ public final class NfcActivityManager extends IAppCallback.Stub
	int readerModeFlags = 0;		int readerModeFlags = 0;
	Bundle readerModeExtras = null;		Bundle readerModeExtras = null;
	Binder token;		Binder token;
			int pollTech;
			int listenTech;

	synchronized (NfcActivityManager.this) {		synchronized (NfcActivityManager.this) {
	NfcActivityState state = findActivityState(activity);		NfcActivityState state = findActivityState(activity);
	if (DBG) Log.d(TAG, "onResume() for " + activity + " " + state);		if (DBG) Log.d(TAG, "onResume() for " + activity + " " + state);
	@@ -286,9 +295,15 @@ public final class NfcActivityManager extends IAppCallback.Stub
	token = state.token;		token = state.token;
	readerModeFlags = state.readerModeFlags;		readerModeFlags = state.readerModeFlags;
	readerModeExtras = state.readerModeExtras;		readerModeExtras = state.readerModeExtras;

			pollTech = state.mPollTech;
			listenTech = state.mListenTech;
	}		}
	if (readerModeFlags != 0) {		if (readerModeFlags != 0) {
	setReaderMode(token, readerModeFlags, readerModeExtras);		setReaderMode(token, readerModeFlags, readerModeExtras);
			} else if (listenTech != NfcAdapter.FLAG_USE_ALL_TECH
			\|\| pollTech != NfcAdapter.FLAG_USE_ALL_TECH) {
			changeDiscoveryTech(token, pollTech, listenTech);
	}		}
	requestNfcServiceCallback();		requestNfcServiceCallback();
	}		}
	@@ -298,6 +313,9 @@ public final class NfcActivityManager extends IAppCallback.Stub
	public void onActivityPaused(Activity activity) {		public void onActivityPaused(Activity activity) {
	boolean readerModeFlagsSet;		boolean readerModeFlagsSet;
	Binder token;		Binder token;
			int pollTech;
			int listenTech;

	synchronized (NfcActivityManager.this) {		synchronized (NfcActivityManager.this) {
	NfcActivityState state = findActivityState(activity);		NfcActivityState state = findActivityState(activity);
	if (DBG) Log.d(TAG, "onPause() for " + activity + " " + state);		if (DBG) Log.d(TAG, "onPause() for " + activity + " " + state);
	@@ -305,10 +323,17 @@ public final class NfcActivityManager extends IAppCallback.Stub
	state.resumed = false;		state.resumed = false;
	token = state.token;		token = state.token;
	readerModeFlagsSet = state.readerModeFlags != 0;		readerModeFlagsSet = state.readerModeFlags != 0;

			pollTech = state.mPollTech;
			listenTech = state.mListenTech;
	}		}
	if (readerModeFlagsSet) {		if (readerModeFlagsSet) {
	// Restore default p2p modes		// Restore default p2p modes
	setReaderMode(token, 0, null);		setReaderMode(token, 0, null);
			} else if (listenTech != NfcAdapter.FLAG_USE_ALL_TECH
			\|\| pollTech != NfcAdapter.FLAG_USE_ALL_TECH) {
			changeDiscoveryTech(token,
			NfcAdapter.FLAG_USE_ALL_TECH, NfcAdapter.FLAG_USE_ALL_TECH);
	}		}
	}		}

	@@ -333,4 +358,53 @@ public final class NfcActivityManager extends IAppCallback.Stub
	}		}
	}		}

			/** setDiscoveryTechnology() implementation */
			public void setDiscoveryTech(Activity activity, int pollTech, int listenTech) {
			boolean isResumed;
			Binder token;
			boolean readerModeFlagsSet;
			synchronized (NfcActivityManager.this) {
			NfcActivityState state = getActivityState(activity);
			readerModeFlagsSet = state.readerModeFlags != 0;
			state.mListenTech = listenTech;
			state.mPollTech = pollTech;
			token = state.token;
			isResumed = state.resumed;
			}
			if (!readerModeFlagsSet && isResumed) {
			changeDiscoveryTech(token, pollTech, listenTech);
			} else if (readerModeFlagsSet) {
			throw new IllegalStateException("Cannot be used when the Reader Mode is enabled");
			}
			}

			/** resetDiscoveryTechnology() implementation */
			public void resetDiscoveryTech(Activity activity) {
			boolean isResumed;
			Binder token;
			boolean readerModeFlagsSet;
			synchronized (NfcActivityManager.this) {
			NfcActivityState state = getActivityState(activity);
			readerModeFlagsSet = state.readerModeFlags != 0;
			state.mListenTech = NfcAdapter.FLAG_USE_ALL_TECH;
			state.mPollTech = NfcAdapter.FLAG_USE_ALL_TECH;
			token = state.token;
			isResumed = state.resumed;
			}
			if (readerModeFlagsSet) {
			disableReaderMode(activity);
			} else if (isResumed) {
			changeDiscoveryTech(token, NfcAdapter.FLAG_USE_ALL_TECH, NfcAdapter.FLAG_USE_ALL_TECH);
			}

			}

			private void changeDiscoveryTech(Binder token, int pollTech, int listenTech) {
			try {
			NfcAdapter.sService.updateDiscoveryTechnology(token, pollTech, listenTech);
			} catch (RemoteException e) {
			mAdapter.attemptDeadServiceRecovery(e);
			}
			}

	}		}

core/java/android/nfc/NfcAdapter.java

+177 −18

Original line number	Original line	Diff line number	Diff line
	@@ -332,6 +332,19 @@ public final class NfcAdapter {
	*/		*/
	public static final int FLAG_READER_NFC_BARCODE = 0x10;		public static final int FLAG_READER_NFC_BARCODE = 0x10;

			/** @hide */
			@IntDef(flag = true, prefix = {"FLAG_READER_"}, value = {
			FLAG_READER_KEEP,
			FLAG_READER_DISABLE,
			FLAG_READER_NFC_A,
			FLAG_READER_NFC_B,
			FLAG_READER_NFC_F,
			FLAG_READER_NFC_V,
			FLAG_READER_NFC_BARCODE
			})
			@Retention(RetentionPolicy.SOURCE)
			public @interface PollTechnology {}

	/**		/**
	* Flag for use with {@link #enableReaderMode(Activity, ReaderCallback, int, Bundle)}.		* Flag for use with {@link #enableReaderMode(Activity, ReaderCallback, int, Bundle)}.
	* <p>		* <p>
	@@ -358,6 +371,76 @@ public final class NfcAdapter {
	*/		*/
	public static final String EXTRA_READER_PRESENCE_CHECK_DELAY = "presence";		public static final String EXTRA_READER_PRESENCE_CHECK_DELAY = "presence";

			/**
			* Flag for use with {@link #setDiscoveryTechnology(Activity, int, int)}.
			* <p>
			* Setting this flag enables listening for Nfc-A technology.
			*/
			@FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
			public static final int FLAG_LISTEN_NFC_PASSIVE_A = 0x1;

			/**
			* Flag for use with {@link #setDiscoveryTechnology(Activity, int, int)}.
			* <p>
			* Setting this flag enables listening for Nfc-B technology.
			*/
			@FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
			public static final int FLAG_LISTEN_NFC_PASSIVE_B = 1 << 1;

			/**
			* Flag for use with {@link #setDiscoveryTechnology(Activity, int, int)}.
			* <p>
			* Setting this flag enables listening for Nfc-F technology.
			*/
			@FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
			public static final int FLAG_LISTEN_NFC_PASSIVE_F = 1 << 2;

			/**
			* Flags for use with {@link #setDiscoveryTechnology(Activity, int, int)}.
			* <p>
			* Setting this flag disables listening.
			*/
			@FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
			public static final int FLAG_LISTEN_DISABLE = 0x0;

			/**
			* Flags for use with {@link #setDiscoveryTechnology(Activity, int, int)}.
			* <p>
			* Setting this flag disables polling.
			*/
			@FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
			public static final int FLAG_READER_DISABLE = 0x0;

			/**
			* Flags for use with {@link #setDiscoveryTechnology(Activity, int, int)}.
			* <p>
			* Setting this flag makes listening to use current flags.
			*/
			@FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
			public static final int FLAG_LISTEN_KEEP = -1;

			/**
			* Flags for use with {@link #setDiscoveryTechnology(Activity, int, int)}.
			* <p>
			* Setting this flag makes polling to use current flags.
			*/
			@FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
			public static final int FLAG_READER_KEEP = -1;

			/** @hide */
			public static final int FLAG_USE_ALL_TECH = 0xff;

			/** @hide */
			@IntDef(flag = true, prefix = {"FLAG_LISTEN_"}, value = {
			FLAG_LISTEN_KEEP,
			FLAG_LISTEN_DISABLE,
			FLAG_LISTEN_NFC_PASSIVE_A,
			FLAG_LISTEN_NFC_PASSIVE_B,
			FLAG_LISTEN_NFC_PASSIVE_F
			})
			@Retention(RetentionPolicy.SOURCE)
			public @interface ListenTechnology {}

	/**		/**
	* @hide		* @hide
	* @removed		* @removed
	@@ -436,11 +519,13 @@ public final class NfcAdapter {
	@Retention(RetentionPolicy.SOURCE)		@Retention(RetentionPolicy.SOURCE)
	public @interface TagIntentAppPreferenceResult {}		public @interface TagIntentAppPreferenceResult {}

	// Guarded by NfcAdapter.class		// Guarded by sLock
	static boolean sIsInitialized = false;		static boolean sIsInitialized = false;
	static boolean sHasNfcFeature;		static boolean sHasNfcFeature;
	static boolean sHasCeFeature;		static boolean sHasCeFeature;

			static Object sLock = new Object();

	// Final after first constructor, except for		// Final after first constructor, except for
	// attemptDeadServiceRecovery() when NFC crashes - we accept a best effort		// attemptDeadServiceRecovery() when NFC crashes - we accept a best effort
	// recovery		// recovery
	@@ -1230,7 +1315,7 @@ public final class NfcAdapter {
	@java.lang.Deprecated		@java.lang.Deprecated
	@UnsupportedAppUsage		@UnsupportedAppUsage
	public void setBeamPushUris(Uri[] uris, Activity activity) {		public void setBeamPushUris(Uri[] uris, Activity activity) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1300,7 +1385,7 @@ public final class NfcAdapter {
	@java.lang.Deprecated		@java.lang.Deprecated
	@UnsupportedAppUsage		@UnsupportedAppUsage
	public void setBeamPushUrisCallback(CreateBeamUrisCallback callback, Activity activity) {		public void setBeamPushUrisCallback(CreateBeamUrisCallback callback, Activity activity) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1385,7 +1470,7 @@ public final class NfcAdapter {
	@UnsupportedAppUsage		@UnsupportedAppUsage
	public void setNdefPushMessage(NdefMessage message, Activity activity,		public void setNdefPushMessage(NdefMessage message, Activity activity,
	Activity ... activities) {		Activity ... activities) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1399,7 +1484,7 @@ public final class NfcAdapter {
	@SystemApi		@SystemApi
	@UnsupportedAppUsage		@UnsupportedAppUsage
	public void setNdefPushMessage(NdefMessage message, Activity activity, int flags) {		public void setNdefPushMessage(NdefMessage message, Activity activity, int flags) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1478,7 +1563,7 @@ public final class NfcAdapter {
	@UnsupportedAppUsage		@UnsupportedAppUsage
	public void setNdefPushMessageCallback(CreateNdefMessageCallback callback, Activity activity,		public void setNdefPushMessageCallback(CreateNdefMessageCallback callback, Activity activity,
	Activity ... activities) {		Activity ... activities) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1529,7 +1614,7 @@ public final class NfcAdapter {
	@UnsupportedAppUsage		@UnsupportedAppUsage
	public void setOnNdefPushCompleteCallback(OnNdefPushCompleteCallback callback,		public void setOnNdefPushCompleteCallback(OnNdefPushCompleteCallback callback,
	Activity activity, Activity ... activities) {		Activity activity, Activity ... activities) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1572,7 +1657,7 @@ public final class NfcAdapter {
	*/		*/
	public void enableForegroundDispatch(Activity activity, PendingIntent intent,		public void enableForegroundDispatch(Activity activity, PendingIntent intent,
	IntentFilter[] filters, String[][] techLists) {		IntentFilter[] filters, String[][] techLists) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1607,7 +1692,7 @@ public final class NfcAdapter {
	* @throws UnsupportedOperationException if FEATURE_NFC is unavailable.		* @throws UnsupportedOperationException if FEATURE_NFC is unavailable.
	*/		*/
	public void disableForegroundDispatch(Activity activity) {		public void disableForegroundDispatch(Activity activity) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1643,7 +1728,7 @@ public final class NfcAdapter {
	*/		*/
	public void enableReaderMode(Activity activity, ReaderCallback callback, int flags,		public void enableReaderMode(Activity activity, ReaderCallback callback, int flags,
	Bundle extras) {		Bundle extras) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1660,7 +1745,7 @@ public final class NfcAdapter {
	* @throws UnsupportedOperationException if FEATURE_NFC is unavailable.		* @throws UnsupportedOperationException if FEATURE_NFC is unavailable.
	*/		*/
	public void disableReaderMode(Activity activity) {		public void disableReaderMode(Activity activity) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1688,7 +1773,7 @@ public final class NfcAdapter {
	@FlaggedApi(Flags.FLAG_ENABLE_NFC_MAINLINE)		@FlaggedApi(Flags.FLAG_ENABLE_NFC_MAINLINE)
	@SuppressLint("VisiblySynchronized")		@SuppressLint("VisiblySynchronized")
	public void setReaderMode(boolean enablePolling) {		public void setReaderMode(boolean enablePolling) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1702,6 +1787,80 @@ public final class NfcAdapter {
	}		}
	}		}

			/**
			* Set the NFC controller to enable specific poll/listen technologies,
			* as specified in parameters, while this Activity is in the foreground.
			*
			* Use {@link #FLAG_READER_KEEP} to keep current polling technology.
			* Use {@link #FLAG_LISTEN_KEEP} to keep current listenig technology.
			* Use {@link #FLAG_READER_DISABLE} to disable polling.
			* Use {@link #FLAG_LISTEN_DISABLE} to disable listening.
			* Also refer to {@link #resetDiscoveryTechnology(Activity)} to restore these changes.
			* </p>
			* The pollTechnology, listenTechnology parameters can be one or several of below list.
			* <pre>
			* Poll Listen
			* Passive A 0x01 (NFC_A) 0x01 (NFC_PASSIVE_A)
			* Passive B 0x02 (NFC_B) 0x02 (NFC_PASSIVE_B)
			* Passive F 0x04 (NFC_F) 0x04 (NFC_PASSIVE_F)
			* ISO 15693 0x08 (NFC_V) -
			* Kovio 0x10 (NFC_BARCODE) -
			* </pre>
			* <p>Example usage in an Activity that requires to disable poll,
			* keep current listen technologies:
			* <pre>
			* protected void onResume() {
			* mNfcAdapter = NfcAdapter.getDefaultAdapter(getApplicationContext());
			* mNfcAdapter.setDiscoveryTechnology(this,
			* NfcAdapter.FLAG_READER_DISABLE, NfcAdapter.FLAG_LISTEN_KEEP);
			* }</pre></p>
			* @param activity The Activity that requests NFC controller to enable specific technologies.
			* @param pollTechnology Flags indicating poll technologies.
			* @param listenTechnology Flags indicating listen technologies.
			* @throws UnsupportedOperationException if FEATURE_NFC,
			* FEATURE_NFC_HOST_CARD_EMULATION, FEATURE_NFC_HOST_CARD_EMULATION_NFCF are unavailable.
			*/

			@FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
			public void setDiscoveryTechnology(@NonNull Activity activity,
			@PollTechnology int pollTechnology, @ListenTechnology int listenTechnology) {
			if (listenTechnology == FLAG_LISTEN_DISABLE) {
			synchronized (sLock) {
			if (!sHasNfcFeature) {
			throw new UnsupportedOperationException();
			}
			}
			mNfcActivityManager.enableReaderMode(activity, null, pollTechnology, null);
			return;
			}
			if (pollTechnology == FLAG_READER_DISABLE) {
			synchronized (sLock) {
			if (!sHasCeFeature) {
			throw new UnsupportedOperationException();
			}
			}
			} else {
			synchronized (sLock) {
			if (!sHasNfcFeature \|\| !sHasCeFeature) {
			throw new UnsupportedOperationException();
			}
			}
			}
			mNfcActivityManager.setDiscoveryTech(activity, pollTechnology, listenTechnology);
			}

			/**
			* Restore the poll/listen technologies of NFC controller,
			* which were changed by {@link #setDiscoveryTechnology(Activity , int , int)}
			*
			* @param activity The Activity that requests to changed technologies.
			*/

			@FlaggedApi(Flags.FLAG_ENABLE_NFC_SET_DISCOVERY_TECH)
			public void resetDiscoveryTechnology(@NonNull Activity activity) {
			mNfcActivityManager.resetDiscoveryTech(activity);
			}

	/**		/**
	* Manually invoke Android Beam to share data.		* Manually invoke Android Beam to share data.
	*		*
	@@ -1732,7 +1891,7 @@ public final class NfcAdapter {
	@java.lang.Deprecated		@java.lang.Deprecated
	@UnsupportedAppUsage		@UnsupportedAppUsage
	public boolean invokeBeam(Activity activity) {		public boolean invokeBeam(Activity activity) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1770,7 +1929,7 @@ public final class NfcAdapter {
	@Deprecated		@Deprecated
	@UnsupportedAppUsage		@UnsupportedAppUsage
	public void enableForegroundNdefPush(Activity activity, NdefMessage message) {		public void enableForegroundNdefPush(Activity activity, NdefMessage message) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -1800,7 +1959,7 @@ public final class NfcAdapter {
	@Deprecated		@Deprecated
	@UnsupportedAppUsage		@UnsupportedAppUsage
	public void disableForegroundNdefPush(Activity activity) {		public void disableForegroundNdefPush(Activity activity) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -2080,7 +2239,7 @@ public final class NfcAdapter {
	@java.lang.Deprecated		@java.lang.Deprecated
	@UnsupportedAppUsage		@UnsupportedAppUsage
	public boolean isNdefPushEnabled() {		public boolean isNdefPushEnabled() {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -2194,7 +2353,7 @@ public final class NfcAdapter {
	@RequiresPermission(android.Manifest.permission.WRITE_SECURE_SETTINGS)		@RequiresPermission(android.Manifest.permission.WRITE_SECURE_SETTINGS)
	public boolean addNfcUnlockHandler(final NfcUnlockHandler unlockHandler,		public boolean addNfcUnlockHandler(final NfcUnlockHandler unlockHandler,
	String[] tagTechnologies) {		String[] tagTechnologies) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}
	@@ -2243,7 +2402,7 @@ public final class NfcAdapter {
	@SystemApi		@SystemApi
	@RequiresPermission(android.Manifest.permission.WRITE_SECURE_SETTINGS)		@RequiresPermission(android.Manifest.permission.WRITE_SECURE_SETTINGS)
	public boolean removeNfcUnlockHandler(NfcUnlockHandler unlockHandler) {		public boolean removeNfcUnlockHandler(NfcUnlockHandler unlockHandler) {
	synchronized (NfcAdapter.class) {		synchronized (sLock) {
	if (!sHasNfcFeature) {		if (!sHasNfcFeature) {
	throw new UnsupportedOperationException();		throw new UnsupportedOperationException();
	}		}