I have an app that invokes a service in the background from an alarm:
// Ok, let's try running the service via a repeating alarm...
// We need to make a PendingIntent from the service intent...
Intent si = new Intent(this, xxxService.class);
PendingIntent pi = PendingIntent.getService(this, 0, si,
PendingIntent.FLAG_UPDATE_CURRENT);
// Set the first time the alarm should trigger to be an hour
ago in milliseconds...
long when = new Date().getTime() - 360000;
AlarmManager alarm = (AlarmManager)
getSystemService(Context.ALARM_SERVICE);
alarm.setInexactRepeating(alarm.RTC_WAKEUP, when,
alarm.INTERVAL_HOUR, pi);
It does a web service call approximately every hour after the app is run
the first time. Because it uses the Inexact method it is likely the
phone is doing something else also. The user never sees it run.
If you are launching an Activity that needs the screen then I think that
is when you need the NEW_ACTIVITY_FLAG? I have the following in use to
start an activity that displays a record selected on a list:
// display the whole record in its own activity.
Intent detailIntent = new Intent(Intent.ACTION_VIEW,
Uri.parse(Sample.CONTENT_URI+"/"+id),
ctx,
xxxActivity.class);
detailIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
try {
ctx.startActivity(detailIntent);
}
catch (Exception e) {
String foo = e.getMessage();
Log.e("Caught It:",foo);
}
I'm not yet sure I'm clear myself on when the flag is required.
On 1/29/2012 1:03 PM, Kostya Vasilyev wrote:
Correct.
Keep in mind though, that, except for some specific cases (an alarm
clock and the like), this -- an activity popping out of nowhere -- can
be an unexpected and jarring experience for the user.
I can see it as a plot device for Final Destination 6: someone's
bleeding to death, trying to call 911 on his Android phone, and is
interrupted by a popup window: "5 days to Jane's birthday". Cut to black.
:)
-- Kostya
29 января 2012 г. 21:41 пользователь Rudolf Polzer
<[email protected] <mailto:[email protected]>> написал:
The LogCat contents after the crash is
ERROR/AndroidRuntime(19994): java.lang.RuntimeException: Unable to
start receiver irp.plan.OnAlarmReceiver:
android.util.AndroidRuntimeException: Calling startActivity() from
outside of an Activity context requires the
FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
...
ERROR/AndroidRuntime(19994): Caused by:
android.util.AndroidRuntimeException: Calling startActivity() from
outside of an Activity context requires the
FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
So I guess I have to add the FLAG_ACTIVITY_NEW_TASK flag to the
intent to start the activity, because the startActivity() is
called from inside the message receiver OnAlarmReceiver.
Am 29.01.2012 16:09, schrieb Kostya Vasilyev:
Press F8 (Resume) in Eclipse a few times until you get the
crash dialog
on the device.
Then check the logcat.
Look for the part after "Caused by:"
-- Kostya
29.01.2012 15:21, Rudolf Polzer пишет:
The manifest file contains
<activity android:name=".WakeActivity"></activity>
within the<application> tag.
The stack is
ActivityThread.handleReceiver(ActivityThread$ReceiverData)
line:
2639
ActivityThread.access$3100(ActivityThread, ActivityThread
$ReceiverData) line: 119
ActivityThread$H.handleMessage(Message) line: 1913
ActivityThread$H(Handler).dispatchMessage(Message) line: 99
Looper.loop() line: 123
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