Page Summary
-
Once a fence is registered, your app needs to add a callback to respond when the fence is triggered.
-
You can add callbacks using a subclass of
BroadcastReceiverto handleIntentmethods from fences. -
A subclass of
BroadcastReceiverlikeFenceReceivercan implementonReceive()to handle intents from fences and extract the fence state usingFenceState.extract().
Once a fence is registered, your app must add a callback to respond
when the fence is triggered. You can do this with the use of a subclass of BroadcastReceiver
to handle Intent
methods from fences.
Before you add callbacks to a fence, you must first register the fence.
Create a subclass of BroadcastReceiver
The following example shows the FenceReceiver
class, which extends BroadcastReceiver
. The class implements the BroadcastReceiver.onReceive()
callback method to handle all Intent
methods
that originate from fences created by your app. When an Intent
is received, the FenceState.extract()
method is used to get the fence state and pass it to the callback.
public
class
FenceReceiver
extends
BroadcastReceiver
{
@
Override
public
void
onReceive
(
Context
context
,
Intent
intent
)
{
FenceState
fenceState
=
FenceState
.
extract
(
intent
);
if
(
TextUtils
.
equals
(
fenceState
.
getFenceKey
(),
FENCE_KEY
))
{
String
fenceStateStr
;
switch
(
fenceState
.
getCurrentState
())
{
case
FenceState
.
TRUE
:
fenceStateStr
=
"true"
;
break
;
case
FenceState
.
FALSE
:
fenceStateStr
=
"false"
;
break
;
case
FenceState
.
UNKNOWN
:
fenceStateStr
=
"unknown"
;
break
;
default
:
fenceStateStr
=
"unknown value"
;
}
mLogFragment
.
getLogView
()
.
println
(
"Fence state: "
+
fenceStateStr
);
}
}
}
