來源：https://developer.android.com/reference/android/content/BroadcastReceiver

BroadcastReceiver

public abstract class BroadcastReceiver 
extends Object 

java.lang.Object
↳	android.content.BroadcastReceiver

Known direct subclasses AppWidgetProvider, DeviceAdminReceiver, MbmsDownloadReceiver, RestrictionsReceiver

 

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Base class for code that receives and handles broadcast intents sent by Context.sendBroadcast(Intent).

You can either dynamically register an instance of this class with 

Context.registerReceiver() or statically declare an implementation with the <receiver> tag in your AndroidManifest.xml.

Developer Guides

For more information about using BroadcastReceiver, read the Broadcasts developer guide.

 

Summary

Nested classes
class	BroadcastReceiver.PendingResult State for a result that is pending for a broadcast receiver.

Public constructors
BroadcastReceiver()

Public methods
final void	abortBroadcast() Sets the flag indicating that this receiver should abort the current broadcast; only works with broadcasts sent through Context.sendOrderedBroadcast.
final void	clearAbortBroadcast() Clears the flag indicating that this receiver should abort the current broadcast.
final boolean	getAbortBroadcast() Returns the flag indicating whether or not this receiver should abort the current broadcast.
final boolean	getDebugUnregister() Return the last value given to setDebugUnregister(boolean).
final int	getResultCode() Retrieve the current result code, as set by the previous receiver.
final String	getResultData() Retrieve the current result data, as set by the previous receiver.
final Bundle	getResultExtras(boolean makeMap) Retrieve the current result extra data, as set by the previous receiver.
finalBroadcastReceiver.PendingResult	goAsync() This can be called by an application in onReceive(Context, Intent) to allow it to keep the broadcast active after returning from that function.
final boolean	isInitialStickyBroadcast() 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.
final boolean	isOrderedBroadcast() Returns true if the receiver is currently processing an ordered broadcast.
abstract void	onReceive(Context context, Intent intent) This method is called when the BroadcastReceiver is receiving an Intent broadcast.
IBinder	peekService(Context myContext, Intent service) Provide a binder to an already-bound service.
final void	setDebugUnregister(boolean debug) Control inclusion of debugging help for mismatched calls to Context.registerReceiver().
final void	setOrderedHint(boolean isOrdered) For internal use, sets the hint about whether this BroadcastReceiver is running in ordered mode.
final void	setResult(int code, String data, Bundle extras) Change all of the result data returned from this broadcasts; only works with broadcasts sent throughContext.sendOrderedBroadcast.
final void	setResultCode(int code) Change the current result code of this broadcast; only works with broadcasts sent throughContext.sendOrderedBroadcast.
final void	setResultData(String data) Change the current result data of this broadcast; only works with broadcasts sent throughContext.sendOrderedBroadcast.
final void	setResultExtras(Bundle extras) Change the current result extras of this broadcast; only works with broadcasts sent throughContext.sendOrderedBroadcast.

Inherited methods
From class java.lang.Object

Public constructors

BroadcastReceiver

added in API level 1

public BroadcastReceiver ()

 

 

Public methods

abortBroadcast

added in API level 1

public final void abortBroadcast ()

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

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

 

 

clearAbortBroadcast

added in API level 1

public final void clearAbortBroadcast ()

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

 

getAbortBroadcast

added in API level 1

public final boolean getAbortBroadcast ()

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

 

Returns
boolean	True if the broadcast should be aborted.

getDebugUnregister

added in API level 1

public final boolean getDebugUnregister ()

Return the last value given to setDebugUnregister(boolean).

 

Returns
boolean

getResultCode

added in API level 1

public final int getResultCode ()

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

 

Returns
int	int The current result code.

getResultData

added in API level 1

public final String getResultData ()

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

 

Returns
String	String The current result data; may be null.

getResultExtras

added in API level 1

public final Bundle getResultExtras (boolean makeMap)

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.

 

Parameters
makeMap	boolean: If true then a new empty Map will be made for you if the current Map is null; if false you should be prepared to receive a null Map.

Returns
Bundle	Map The current extras map.

goAsync

added in API level 11

public final BroadcastReceiver.PendingResult goAsync ()

This can be called by an application in onReceive(Context, Intent) 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 they 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 ultimatelyPendingResult.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 JobScheduler, Service, or see especially 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.

 

 

Returns
BroadcastReceiver.PendingResult	Returns a BroadcastReceiver.PendingResult representing the result of the active broadcast. The BroadcastRecord itself is no longer active; all data and other interaction must go through BroadcastReceiver.PendingResult APIs. The PendingResult.finish() method must be called once processing of the broadcast is done.

isInitialStickyBroadcast

added in API level 5

public final boolean isInitialStickyBroadcast ()

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.

 

Returns
boolean

isOrderedBroadcast

added in API level 5

public final boolean isOrderedBroadcast ()

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

 

Returns
boolean

onReceive

added in API level 1

public abstract void onReceive (Context context, Intent intent)

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 usingContext.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 JobService with JobScheduler. If you wish to interact with a service that is already running and previously bound using bindService(), you can use peekService(Context, Intent).

The Intent filters used in Context.registerReceiver(BroadcastReceiver, IntentFilter) 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.

 

Parameters
context	Context: The Context in which the receiver is running.
intent	Intent: The Intent being received.

peekService

added in API level 3

public IBinder peekService (Context myContext, Intent service)

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(Context, Intent). For peekService() to return a non null IBinderinterface the service must have published it before. In other words some component must have called Context.bindService(Intent, ServiceConnection, int) on it.

 

Parameters
myContext	Context: The Context that had been passed to onReceive(Context, Intent)
service	Intent: Identifies the already-bound service you wish to use. See Context.bindService(Intent, ServiceConnection, int) for more information.

Returns
IBinder

setDebugUnregister

added in API level 1

public final void setDebugUnregister (boolean debug)

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.

 

Parameters
debug	boolean

setOrderedHint

added in API level 1

public final void setOrderedHint (boolean isOrdered)

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

 

Parameters
isOrdered	boolean

setResult

added in API level 1

public final void setResult (int code, String data, Bundle extras)

Change all of the result data returned from this broadcasts; only works with broadcasts sent throughContext.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

 

 

Parameters
code	int: The new result code. Often uses the Activity Activity.RESULT_CANCELED and Activity.RESULT_OK constants, though the actual meaning of this value is ultimately up to the broadcaster.
data	String: The new result data. This is an arbitrary string whose interpretation is up to the broadcaster; may be null.
extras	Bundle: The new extra data map. This is a Bundle holding arbitrary data, whose interpretation is up to the broadcaster. Can be set to null. This completely replaces the current map (if any).

setResultCode

added in API level 1

public final void setResultCode (int code)

Change the current result code of this broadcast; only works with broadcasts sent throughContext.sendOrderedBroadcast. Often uses the Activity Activity.RESULT_CANCELED and Activity.RESULT_OKconstants, 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

 

 

Parameters
code	int: The new result code.

See also:

• setResult(int, String, Bundle)

setResultData

added in API level 1

public final void setResultData (String data)

Change the current result data of this broadcast; only works with broadcasts sent throughContext.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

 

 

Parameters
data	String: The new result data; may be null.

See also:

• setResult(int, String, Bundle)

setResultExtras

added in API level 1

public final void setResultExtras (Bundle extras)

Change the current result extras of this broadcast; only works with broadcasts sent throughContext.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

 

 

Parameters
extras	Bundle: The new extra data map; may be null.

See also:

• setResult(int, String, Bundle)