[android-beginners] I can't make a scheduled task fire

[aefaradien]

Hi guys,

I have spend over an hour trying to make this work now.  I must be
missing something obvious, but no amount of searching is working.

I am trying to schedule a task to run every few minutes, and i am
trying to do it using scheduleAtFixedRate().

I am testing this in a very basic hello world app to isolate it from
the rest of my project.  I have a very simple app with one Activity
and in its onCreate() method i have the following code:

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

final Runnable task = new Runnable() {
public void run() {
Toast.makeText(getApplicationContext(), "RUN!",
Toast.LENGTH_SHORT).show();
}
};
final ScheduledExecutorService locationUdateScheduler =
Executors.newScheduledThreadPool(1);
locationUdateScheduler.scheduleAtFixedRate(
task, 1, 10, TimeUnit.SECONDS);
}

For some reason i can not work out, when i run this I never see the
toast message.  Any help debugging this would be much appreciated.

p.s. i have a vague hunch it might be because i have not added
something to the manifest file, but searching around the internet
reveals nothing of relevance.

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[android-beginners] Re: I can't make a scheduled task fire

[aefaradien]

Since i did eventually work it out, i might as well post the answer
here for anyone who searches in the future:

final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
Toast.makeText(getApplicationContext(), "Run!",
Toast.LENGTH_SHORT).show();
}
};

class ScheduledTaskWithHandeler implements Runnable {
@Override
public void run() {
handler.sendEmptyMessage(0);
}
}

final ScheduledExecutorService locationUdateScheduler =
Executors.newScheduledThreadPool(1);
scheduleHandle = locationUdateScheduler.scheduleAtFixedRate(new
ScheduledTaskWithHandeler(), 1, 5, TimeUnit.SECONDS);

The reason is: scheduled tasks are run in another thread, so you must
used a handler (which lives on the main thread) to do the work.  Any
messages sent to the handler are processed the next time the main
thread processes messages and events (near instant if the main thread
is not busy).

On Oct 2, 10:46 pm, aefaradien  wrote:
> Hi guys,
>
> I have spend over an hour trying to make this work now.  I must be
> missing something obvious, but no amount of searching is working.
>
> I am trying to schedule a task to run every few minutes, and i am
> trying to do it using scheduleAtFixedRate().
>
> I am testing this in a very basic hello world app to isolate it from
> the rest of my project.  I have a very simple app with one Activity
> and in its onCreate() method i have the following code:
>
>     @Override
>     public void onCreate(Bundle savedInstanceState) {
>         super.onCreate(savedInstanceState);
>         setContentView(R.layout.main);
>
>                 final Runnable task = new Runnable() {
>                         public void run() {
>                                 Toast.makeText(getApplicationContext(), 
> "RUN!",
>                                                 Toast.LENGTH_SHORT).show();
>                         }
>                 };
>                 final ScheduledExecutorService locationUdateScheduler =
>                         Executors.newScheduledThreadPool(1);
>                 locationUdateScheduler.scheduleAtFixedRate(
>                                 task, 1, 10, TimeUnit.SECONDS);
>     }
>
> For some reason i can not work out, when i run this I never see the
> toast message.  Any help debugging this would be much appreciated.
>
> p.s. i have a vague hunch it might be because i have not added
> something to the manifest file, but searching around the internet
> reveals nothing of relevance.
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[android-beginners] Querying AlarmManager to determine if alarms are set

[aefaradien]

Hi there, does anyone know if its possible to query the AlarmManager
to see if/what alarms are set?

I can set an alarm using:

AlarmManager am =
(AlarmManager)getApplicationContext().getSystemService
(Context.ALARM_SERVICE);
Intent i = new Intent(getApplicationContext(), OnAlarmReceiver.class);
PendingIntent pi=PendingIntent.getBroadcast(getApplicationContext(),
0, i,
PendingIntent.FLAG_CANCEL_CURRENT);
am.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
SystemClock.elapsedRealtime(), Const.UPDATE_INTERVAL_MS, pi);

And i can then cancel it using:

am.cancel(pi);

But i can not figure out how to determine if the alarm is still set
(e.g. so an activity can inform the user that the scheduled task is
already set).  AlarmManager has not "isSet()" method.

Can anyone shed any light on this?  Is it even possible?

many thanks in advance.
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