LocalBroadcastManager

Kotlin |Java

class LocalBroadcastManager

kotlin.Any
↳	androidx.localbroadcastmanager.content.LocalBroadcastManager

Helper to register for and send broadcasts of Intents to local objects within your process. This has a number of advantages over sending global broadcasts with android.content.Context#sendBroadcast:

• You know that the data you are broadcasting won't leave your app, so don't need to worry about leaking private data.
• It is not possible for other applications to send these broadcasts to your app, so you don't need to worry about having security holes they can exploit.
• It is more efficient than sending a global broadcast through the system.

Summary

Public methods
static LocalBroadcastManager	getInstance(@NonNull context: Context)
Unit	registerReceiver(@NonNull receiver: BroadcastReceiver, @NonNull filter: IntentFilter) Register a receive for any local broadcasts that match the given IntentFilter.
Boolean	sendBroadcast(@NonNull intent: Intent) Broadcast the given intent to all interested BroadcastReceivers.
Unit	sendBroadcastSync(@NonNull intent: Intent) Like sendBroadcast(Intent), but if there are any receivers for the Intent this function will block and immediately dispatch them before returning.
Unit	unregisterReceiver(@NonNull receiver: BroadcastReceiver) Unregister a previously registered BroadcastReceiver.

Public methods

getInstance

@NonNull static fun getInstance(@NonNull context: Context): LocalBroadcastManager

registerReceiver

fun registerReceiver(
    @NonNull receiver: BroadcastReceiver, 
    @NonNull filter: IntentFilter
): Unit

Register a receive for any local broadcasts that match the given IntentFilter.

Parameters
receiver	BroadcastReceiver: The BroadcastReceiver to handle the broadcast.
filter	IntentFilter: Selects the Intent broadcasts to be received.

See Also

• #unregisterReceiver

sendBroadcast

fun sendBroadcast(@NonNull intent: Intent): Boolean

Broadcast the given intent to all interested BroadcastReceivers. This call is asynchronous; it returns immediately, and you will continue executing while the receivers are run.

Parameters
intent	Intent: The Intent to broadcast; all receivers matching this Intent will receive the broadcast.

Return
Boolean	Returns true if the intent has been scheduled for delivery to one or more broadcast receivers. (Note tha delivery may not ultimately take place if one of those receivers is unregistered before it is dispatched.)

See Also

• #registerReceiver

sendBroadcastSync

fun sendBroadcastSync(@NonNull intent: Intent): Unit

Like sendBroadcast(Intent), but if there are any receivers for the Intent this function will block and immediately dispatch them before returning.

unregisterReceiver

fun unregisterReceiver(@NonNull receiver: BroadcastReceiver): Unit

Unregister a previously registered BroadcastReceiver. All filters that have been registered for this BroadcastReceiver will be removed.

Parameters
receiver	BroadcastReceiver: The BroadcastReceiver to unregister.

See Also

• #registerReceiver