Added in API level 26

Summary: Methods | Protected Methods | Inherited Methods

WifiAwareSession

Kotlin |Java

public class WifiAwareSession
extends Object implements AutoCloseable

java.lang.Object
↳	android.net.wifi.aware.WifiAwareSession

This class represents a Wi-Fi Aware session - an attachment to the Wi-Fi Aware service through which the app can execute discovery operations.

Summary

Public methods
`void`	`close()` Destroy the Wi-Fi Aware service session and, if no other applications are attached to Aware, also disable Aware.
`NetworkSpecifier`	`createNetworkSpecifierOpen(int role, byte[] peer)` This method was deprecated in API level 31. Please use in-band data-path setup, refer to `WifiAwareNetworkSpecifier.Builder`, `publish(android.net.wifi.aware.PublishConfig, android.net.wifi.aware.DiscoverySessionCallback, android.os.Handler)` and `subscribe(android.net.wifi.aware.SubscribeConfig, android.net.wifi.aware.DiscoverySessionCallback, android.os.Handler)`
`NetworkSpecifier`	`createNetworkSpecifierPassphrase(int role, byte[] peer, String passphrase)` This method was deprecated in API level 31. Please use in-band data-path setup, refer to `WifiAwareNetworkSpecifier.Builder`, `publish(android.net.wifi.aware.PublishConfig, android.net.wifi.aware.DiscoverySessionCallback, android.os.Handler)` and `subscribe(android.net.wifi.aware.SubscribeConfig, android.net.wifi.aware.DiscoverySessionCallback, android.os.Handler)`
`void`	`publish(PublishConfig publishConfig, DiscoverySessionCallback callback, Handler handler)` Issue a request to the Aware service to create a new Aware publish discovery session, using the specified `publishConfig` configuration.
`void`	`subscribe(SubscribeConfig subscribeConfig, DiscoverySessionCallback callback, Handler handler)` Issue a request to the Aware service to create a new Aware subscribe discovery session, using the specified `subscribeConfig` configuration.

Protected methods
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

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.

From interface


        
          java.lang.AutoCloseable


      close()

Closes this resource, relinquishing any underlying resources.

Public methods

close

Added in API level 26

public void close ()

Destroy the Wi-Fi Aware service session and, if no other applications are attached to Aware, also disable Aware. This method destroys all outstanding operations - i.e. all publish and subscribes are terminated, and any outstanding data-links are shut-down. However, it is good practice to destroy these discovery sessions and connections explicitly before a session-wide destroy.

An application may re-attach after a destroy using WifiAwareManager.attach(AttachCallback, Handler) .

createNetworkSpecifierOpen

Added in API level 26
Deprecated in API level 31

public NetworkSpecifier createNetworkSpecifierOpen (int role, 
                byte[] peer)

This method was deprecated in API level 31.
Please use in-band data-path setup, refer to WifiAwareNetworkSpecifier.Builder, publish(android.net.wifi.aware.PublishConfig, android.net.wifi.aware.DiscoverySessionCallback, android.os.Handler) and subscribe(android.net.wifi.aware.SubscribeConfig, android.net.wifi.aware.DiscoverySessionCallback, android.os.Handler)

Create a NetworkRequest.Builder.setNetworkSpecifier(NetworkSpecifier) for an unencrypted WiFi Aware connection (link) to the specified peer. The NetworkRequest.Builder.addTransportType(int) should be set to NetworkCapabilities.TRANSPORT_WIFI_AWARE.

This API is targeted for applications which can obtain the peer MAC address using OOB (out-of-band) discovery. Aware discovery does not provide the MAC address of the peer - when using Aware discovery use the alternative network specifier method - WifiAwareNetworkSpecifier.Builder.

To set up an encrypted link use the createNetworkSpecifierPassphrase(int, byte[], java.lang.String) API.

Parameters
`role`	`int`: The role of this device: `WifiAwareManager.WIFI_AWARE_DATA_PATH_ROLE_INITIATOR` or `WifiAwareManager.WIFI_AWARE_DATA_PATH_ROLE_RESPONDER` Value is one of the following: `WifiAwareManager.WIFI_AWARE_DATA_PATH_ROLE_INITIATOR` `WifiAwareManager.WIFI_AWARE_DATA_PATH_ROLE_RESPONDER`
`peer`	`byte`: The MAC address of the peer's Aware discovery interface. On a RESPONDER this value is used to gate the acceptance of a connection request from only that peer. This value cannot be `null`.

Returns
`NetworkSpecifier`	A `NetworkSpecifier` to be used to construct `NetworkRequest.Builder.setNetworkSpecifier(NetworkSpecifier)` to pass to `ConnectivityManager.requestNetwork(android.net.NetworkRequest, android.net.ConnectivityManager.NetworkCallback)` [or other varieties of that API].

createNetworkSpecifierPassphrase

Added in API level 26
Deprecated in API level 31

public NetworkSpecifier createNetworkSpecifierPassphrase (int role, 
                byte[] peer, 
                String passphrase)

Create a NetworkRequest.Builder.setNetworkSpecifier(NetworkSpecifier) for an encrypted WiFi Aware connection (link) to the specified peer. The NetworkRequest.Builder.addTransportType(int) should be set to NetworkCapabilities.TRANSPORT_WIFI_AWARE.

Parameters
`role`	`int`: The role of this device: `WifiAwareManager.WIFI_AWARE_DATA_PATH_ROLE_INITIATOR` or `WifiAwareManager.WIFI_AWARE_DATA_PATH_ROLE_RESPONDER` Value is one of the following: `WifiAwareManager.WIFI_AWARE_DATA_PATH_ROLE_INITIATOR` `WifiAwareManager.WIFI_AWARE_DATA_PATH_ROLE_RESPONDER`
`peer`	`byte`: The MAC address of the peer's Aware discovery interface. On a RESPONDER this value is used to gate the acceptance of a connection request from only that peer. This value cannot be `null`.
`passphrase`	`String`: The passphrase to be used to encrypt the link. The PMK is generated from the passphrase. Use `createNetworkSpecifierOpen(int, byte[])` to specify an open (unencrypted) link. This value cannot be `null`.

Returns
`NetworkSpecifier`	A `NetworkSpecifier` to be used to construct `NetworkRequest.Builder.setNetworkSpecifier(NetworkSpecifier)` to pass to `ConnectivityManager.requestNetwork(android.net.NetworkRequest, android.net.ConnectivityManager.NetworkCallback)` [or other varieties of that API].

publish

Added in API level 26

public void publish (PublishConfig publishConfig, 
                DiscoverySessionCallback callback, 
                Handler handler)

Issue a request to the Aware service to create a new Aware publish discovery session, using the specified publishConfig configuration. The results of the publish operation are routed to the callbacks of DiscoverySessionCallback:

DiscoverySessionCallback.onPublishStarted( PublishDiscoverySession) is called when the publish session is created and provides a handle to the session. Further operations on the publish session can be executed on that object.
DiscoverySessionCallback.onSessionConfigFailed() is called if the publish operation failed.

Other results of the publish session operations will also be routed to callbacks on the callback object. The resulting publish session can be modified using PublishDiscoverySession.updatePublish(PublishConfig).

The total count of currently available Wi-Fi Aware publish sessions is limited and is available via the AwareResources.getAvailablePublishSessionsCount() method.

An application must use the DiscoverySession.close() to terminate the publish discovery session once it isn't needed. This will free resources as well terminate any on-air transmissions.

If targeting Build.VERSION_CODES.TIRAMISU or later, the application must have Manifest.permission.NEARBY_WIFI_DEVICES with android:usesPermissionFlags="neverForLocation". If the application does not declare android:usesPermissionFlags="neverForLocation", then it must also have Manifest.permission.ACCESS_FINE_LOCATION. If targeting an earlier release than Build.VERSION_CODES.TIRAMISU, the application must have Manifest.permission.ACCESS_FINE_LOCATION.

Parameters
`publishConfig`	`PublishConfig`: The `PublishConfig` specifying the configuration of the requested publish session. This value cannot be `null`.
`callback`	`DiscoverySessionCallback`: A `DiscoverySessionCallback` derived object to be used for session event callbacks. This value cannot be `null`.
`handler`	`Handler`: The Handler on whose thread to execute the callbacks of the `callback` object. If a null is provided then the application's main thread will be used.

Added in API level 26

public void subscribe (SubscribeConfig subscribeConfig, 
                DiscoverySessionCallback callback, 
                Handler handler)

Issue a request to the Aware service to create a new Aware subscribe discovery session, using the specified subscribeConfig configuration. The results of the subscribe operation are routed to the callbacks of DiscoverySessionCallback:

DiscoverySessionCallback.onSubscribeStarted( SubscribeDiscoverySession) is called when the subscribe session is created and provides a handle to the session. Further operations on the subscribe session can be executed on that object.
DiscoverySessionCallback.onSessionConfigFailed() is called if the subscribe operation failed.

Other results of the subscribe session operations will also be routed to callbacks on the callback object. The resulting subscribe session can be modified using SubscribeDiscoverySession.updateSubscribe(SubscribeConfig).

The total count of currently available Wi-Fi Aware subscribe sessions is limited and is available via the AwareResources.getAvailableSubscribeSessionsCount() method.

An application must use the DiscoverySession.close() to terminate the subscribe discovery session once it isn't needed. This will free resources as well terminate any on-air transmissions.

Parameters
`subscribeConfig`	`SubscribeConfig`: The `SubscribeConfig` specifying the configuration of the requested subscribe session. This value cannot be `null`.
`callback`	`DiscoverySessionCallback`: A `DiscoverySessionCallback` derived object to be used for session event callbacks. This value cannot be `null`.
`handler`	`Handler`: The Handler on whose thread to execute the callbacks of the `callback` object. If a null is provided then the application's main thread will be used.

Protected methods

finalize

Added in API level 26

protected void finalize ()

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the finalize method to dispose of system resources or to perform other cleanup.

The general contract of finalize is that it is invoked if and when the Java virtual machine has determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The finalize method may take any action, including making this object available again to other threads; the usual purpose of finalize, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.

The finalize method of class Object performs no special action; it simply returns normally. Subclasses of Object may override this definition.

The Java programming language does not guarantee which thread will invoke the finalize method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates.

After the finalize method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded.

The finalize method is never invoked more than once by a Java virtual machine for any given object.

Any exception thrown by the finalize method causes the finalization of this object to be halted, but is otherwise ignored.

Throws
`Throwable`