BroadcastReceiver

BroadcastReceiver

BroadcastReceiver()

abortBroadcast

fun abortBroadcast(): Unit

Sets the flag indicating that this receiver should abort the current broadcast; only works with broadcasts sent through Context.sendOrderedBroadcast. This will prevent any other broadcast receivers from receiving the broadcast. It will still call onReceive of the BroadcastReceiver that the caller of Context.sendOrderedBroadcast passed in.

This method does not work with non-ordered broadcasts such as those sent with Context.sendBroadcast

clearAbortBroadcast

fun clearAbortBroadcast(): Unit

Clears the flag indicating that this receiver should abort the current broadcast.

getAbortBroadcast

fun getAbortBroadcast(): Boolean

Returns the flag indicating whether or not this receiver should abort the current broadcast.

getDebugUnregister

fun getDebugUnregister(): Boolean

Return the last value given to setDebugUnregister.

getResultCode

fun getResultCode(): Int

Retrieve the current result code, as set by the previous receiver.

getResultData

fun getResultData(): String!

Retrieve the current result data, as set by the previous receiver. Often this is null.

getResultExtras

fun getResultExtras(makeMap: Boolean): Bundle!

Retrieve the current result extra data, as set by the previous receiver. Any changes you make to the returned Map will be propagated to the next receiver.

getSentFromPackage

open fun getSentFromPackage(): String?

Returns the package name of the app that initially sent this broadcast.

getSentFromUid

open fun getSentFromUid(): Int

Returns the uid of the app that initially sent this broadcast.

goAsync

fun goAsync(): BroadcastReceiver.PendingResult!

This can be called by an application in onReceive to allow it to keep the broadcast active after returning from that function. This does not change the expectation of being relatively responsive to the broadcast, but does allow the implementation to move work related to it over to another thread to avoid glitching the main UI thread due to disk IO.

As a general rule, broadcast receivers are allowed to run for up to 10 seconds before the system will consider them non-responsive and ANR the app. Since these usually execute on the app's main thread, they are already bound by the ~5 second time limit of various operations that can happen there (not to mention just avoiding UI jank), so the receive limit is generally not of concern. However, once you use goAsync, though able to be off the main thread, the broadcast execution limit still applies, and that includes the time spent between calling this method and ultimately PendingResult.finish().

If you are taking advantage of this method to have more time to execute, it is useful to know that the available time can be longer in certain situations. In particular, if the broadcast you are receiving is not a foreground broadcast (that is, the sender has not used Intent#FLAG_RECEIVER_FOREGROUND), then more time is allowed for the receivers to run, allowing them to execute for 30 seconds or even a bit more. This is something that receivers should rarely take advantage of (long work should be punted to another system facility such as android.app.job.JobScheduler, android.app.Service, or see especially androidx.core.app.JobIntentService), but can be useful in certain rare cases where it is necessary to do some work as soon as the broadcast is delivered. Keep in mind that the work you do here will block further broadcasts until it completes, so taking advantage of this at all excessively can be counter-productive and cause later events to be received more slowly.

isInitialStickyBroadcast

fun isInitialStickyBroadcast(): Boolean

Returns true if the receiver is currently processing the initial value of a sticky broadcast -- that is, the value that was last broadcast and is currently held in the sticky cache, so this is not directly the result of a broadcast right now.

isOrderedBroadcast

fun isOrderedBroadcast(): Boolean

Returns true if the receiver is currently processing an ordered broadcast.

onReceive

abstract fun onReceive(
    context: Context!, 
    intent: Intent!
): Unit

This method is called when the BroadcastReceiver is receiving an Intent broadcast. During this time you can use the other methods on BroadcastReceiver to view/modify the current result values. This method is always called within the main thread of its process, unless you explicitly asked for it to be scheduled on a different thread using android.content.Context#registerReceiver(BroadcastReceiver, * IntentFilter, String, android.os.Handler). When it runs on the main thread you should never perform long-running operations in it (there is a timeout of 10 seconds that the system allows before considering the receiver to be blocked and a candidate to be killed). You cannot launch a popup dialog in your implementation of onReceive().

If this BroadcastReceiver was launched through a <receiver> tag, then the object is no longer alive after returning from this function. This means you should not perform any operations that return a result to you asynchronously. If you need to perform any follow up background work, schedule a android.app.job.JobService with android.app.job.JobScheduler. If you wish to interact with a service that is already running and previously bound using bindService(), you can use peekService.

The Intent filters used in android.content.Context#registerReceiver and in application manifests are not guaranteed to be exclusive. They are hints to the operating system about how to find suitable recipients. It is possible for senders to force delivery to specific recipients, bypassing filter resolution. For this reason, onReceive() implementations should respond only to known actions, ignoring any unexpected Intents that they may receive.

peekService

open fun peekService(
    myContext: Context!, 
    service: Intent!
): IBinder!

Provide a binder to an already-bound service. This method is synchronous and will not start the target service if it is not present, so it is safe to call from onReceive. For peekService() to return a non null android.os.IBinder interface the service must have published it before. In other words some component must have called android.content.Context#bindService(Intent, ServiceConnection, int) on it.

setDebugUnregister

fun setDebugUnregister(debug: Boolean): Unit

Control inclusion of debugging help for mismatched calls to Context.registerReceiver(). If called with true, before given to registerReceiver(), then the callstack of the following Context.unregisterReceiver() call is retained, to be printed if a later incorrect unregister call is made. Note that doing this requires retaining information about the BroadcastReceiver for the lifetime of the app, resulting in a leak -- this should only be used for debugging.

setOrderedHint

fun setOrderedHint(isOrdered: Boolean): Unit

For internal use, sets the hint about whether this BroadcastReceiver is running in ordered mode.

setResult

fun setResult(
    code: Int, 
    data: String!, 
    extras: Bundle!
): Unit

Change all of the result data returned from this broadcasts; only works with broadcasts sent through Context.sendOrderedBroadcast. All current result data is replaced by the value given to this method.

This method does not work with non-ordered broadcasts such as those sent with Context.sendBroadcast

setResultCode

fun setResultCode(code: Int): Unit

Change the current result code of this broadcast; only works with broadcasts sent through Context.sendOrderedBroadcast. Often uses the Activity android.app.Activity#RESULT_CANCELED and android.app.Activity#RESULT_OK constants, though the actual meaning of this value is ultimately up to the broadcaster.

This method does not work with non-ordered broadcasts such as those sent with Context.sendBroadcast

setResultData

fun setResultData(data: String!): Unit

Change the current result data of this broadcast; only works with broadcasts sent through Context.sendOrderedBroadcast. This is an arbitrary string whose interpretation is up to the broadcaster.

This method does not work with non-ordered broadcasts such as those sent with Context.sendBroadcast

setResultExtras

fun setResultExtras(extras: Bundle!): Unit

Change the current result extras of this broadcast; only works with broadcasts sent through Context.sendOrderedBroadcast. This is a Bundle holding arbitrary data, whose interpretation is up to the broadcaster. Can be set to null. Calling this method completely replaces the current map (if any).

This method does not work with non-ordered broadcasts such as those sent with Context.sendBroadcast