Added in API level 24

Summary: Methods | Inherited Methods

NfcFCardEmulation

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Kotlin |Java

public final class NfcFCardEmulation
extends Object

java.lang.Object
↳	android.nfc.cardemulation.NfcFCardEmulation

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This class can be used to query the state of NFC-F card emulation services. For a general introduction into NFC card emulation, please read the NFC card emulation developer guide.

Use of this class requires the PackageManager#FEATURE_NFC_HOST_CARD_EMULATION_NFCF to be present on the device.

Summary

Public methods
boolean	disableService(Activity activity) Disables the service for the specified Activity.
boolean	enableService(Activity activity, ComponentName service) Allows a foreground application to specify which card emulation service should be enabled while a specific Activity is in the foreground.
static NfcFCardEmulation	getInstance(NfcAdapter adapter) Helper to get an instance of this class.
String	getNfcid2ForService(ComponentName service) Retrieves the current NFCID2 for the specified service.
String	getSystemCodeForService(ComponentName service) Retrieves the current System Code for the specified service.
boolean	registerSystemCodeForService(ComponentName service, String systemCode) Registers a System Code for the specified service.
boolean	setNfcid2ForService(ComponentName service, String nfcid2) Set a NFCID2 for the specified service.
boolean	unregisterSystemCodeForService(ComponentName service) Removes a registered System Code for the specified service.

Inherited methods

From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public methods

disableService

Added in API level 24

public boolean disableService (Activity activity)

Disables the service for the specified Activity.

Note that the specified Activity must still be in resumed state at the time of this call. A good place to call this method is in your Activity#onPause implementation.

Parameters
activity	Activity: The activity which the service was registered for

Returns
boolean	true when successful

Throws
RuntimeException

enableService

Added in API level 24

public boolean enableService (Activity activity, 
                ComponentName service)

Allows a foreground application to specify which card emulation service should be enabled while a specific Activity is in the foreground.

The specified HCE-F service is only enabled when the corresponding application is in the foreground and this method has been called. When the application is moved to the background, disableService(android.app.Activity) is called, or NFCID2 or System Code is replaced, the HCE-F service is disabled.

The specified Activity must currently be in resumed state. A good paradigm is to call this method in your Activity#onResume, and to call disableService(android.app.Activity) in your Activity#onPause.

Note that this preference is not persisted by the OS, and hence must be called every time the Activity is resumed.

Parameters
activity	Activity: The activity which prefers this service to be invoked
service	ComponentName: The service to be preferred while this activity is in the foreground

Returns
boolean	whether the registration was successful

Throws
RuntimeException

getInstance

Added in API level 24

public static NfcFCardEmulation getInstance (NfcAdapter adapter)

Helper to get an instance of this class.

Parameters
adapter	NfcAdapter: A reference to an NfcAdapter object.

Returns
NfcFCardEmulation

getNfcid2ForService

Added in API level 24

public String getNfcid2ForService (ComponentName service)

Retrieves the current NFCID2 for the specified service.

Before calling setNfcid2ForService(android.content.ComponentName, java.lang.String), the NFCID2 contained in the Manifest file is returned. If "random" is specified in the Manifest file, a random number assigned by the system at installation time is returned. After setting an NFCID2 with setNfcid2ForService(android.content.ComponentName, java.lang.String), this NFCID2 is returned.

Parameters
service	ComponentName: The component name of the service

Returns
String	the current NFCID2

Throws
RuntimeException

getSystemCodeForService

Added in API level 24

public String getSystemCodeForService (ComponentName service)

Retrieves the current System Code for the specified service.

Before calling registerSystemCodeForService(android.content.ComponentName, java.lang.String), the System Code contained in the Manifest file is returned. After calling registerSystemCodeForService(android.content.ComponentName, java.lang.String), the System Code registered there is returned. After calling unregisterSystemCodeForService(android.content.ComponentName), "null" is returned.

Parameters
service	ComponentName: The component name of the service

Returns
String	the current System Code

Throws
RuntimeException

registerSystemCodeForService

Added in API level 24

public boolean registerSystemCodeForService (ComponentName service, 
                String systemCode)

Registers a System Code for the specified service.

The System Code must be in range from "4000" to "4FFF" (excluding "4*FF").

If a System Code was previously registered for this service (either statically through the manifest, or dynamically by using this API), it will be replaced with this one.

Even if the same System Code is already registered for another service, this method succeeds in registering the System Code.

Note that you can only register a System Code for a service that is running under the same UID as the caller of this API. Typically this means you need to call this from the same package as the service itself, though UIDs can also be shared between packages using shared UIDs.

Parameters
service	ComponentName: The component name of the service
systemCode	String: The System Code to be registered

Returns
boolean	whether the registration was successful.

Throws
RuntimeException

setNfcid2ForService

Added in API level 24

public boolean setNfcid2ForService (ComponentName service, 
                String nfcid2)

Set a NFCID2 for the specified service.

The NFCID2 must be in range from "02FE000000000000" to "02FEFFFFFFFFFFFF".

If a NFCID2 was previously set for this service (either statically through the manifest, or dynamically by using this API), it will be replaced.

Note that you can only set the NFCID2 for a service that is running under the same UID as the caller of this API. Typically this means you need to call this from the same package as the service itself, though UIDs can also be shared between packages using shared UIDs.

Parameters
service	ComponentName: The component name of the service
nfcid2	String: The NFCID2 to be registered

Returns
boolean	whether the setting was successful.

Throws
RuntimeException

unregisterSystemCodeForService

Added in API level 24

public boolean unregisterSystemCodeForService (ComponentName service)

Removes a registered System Code for the specified service.

Parameters
service	ComponentName: The component name of the service

Returns
boolean	whether the System Code was successfully removed.

Throws
RuntimeException