Using startForeground() with an Intent Service

Question

I am trying to keep alive a service that reacts to screen on/off changes. The service would work perfectly for awhile, but then eventually it would be killed. I am now attem

Answer 1

(Updated) I suppose there are the following possible cases:

1) documentation for IntentService states:

the service is started as needed, handles each Intent in turn using a worker thread, and stops itself when it runs out of work.

So, it might be that your service is normally stopped after onHandleIntent() is finished (especially, as you mentioned that startForeground() added no extra life to the process).

2) You might try to check if it's somehow can be related to device going to sleep (or maybe you are starting your service by schedule and awkening device - in this case you might need to acquire WakeLock)

3) In the very rare cases, the system still can kill foreground process - so if you do a lot of allocations (really lot) and some other work in onHandleIntent() (instead of "Blah Blah Blah" at your code) - you might run into it - but I suppose it's not the case.

As question's title is "Using startForeground() with an IntentService" - would like to clarify that too: I believe nothing (architecture, best practices, android framework, java docs for IntentService) prevents you from running your intent service as a foreground. Of course you need to thought out carefully its usage and whether you actually need a foreground service. Some ideas are available here. For sample code see below. (Sample code can end up showing multiple notifications if you queued multiple jobs/intents into IntentService, so there might be better solution depending on your need.)

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public class ForegroundService extends IntentService {

    private static final String TAG = "FrgrndSrv";

    public ForegroundService() {
        super(TAG);
    }

    @Override
    protected void onHandleIntent(Intent intent) {

        Notification.Builder builder = new Notification.Builder(getBaseContext())
                .setSmallIcon(R.drawable.ic_foreground_service)
                .setTicker("Your Ticker") // use something from something from R.string
                .setContentTitle("Your content title") // use something from something from
                .setContentText("Your content text") // use something from something from
                .setProgress(0, 0, true); // display indeterminate progress

        startForeground(1, builder.build());
        try {
            doIntesiveWork();
        } finally {
            stopForeground(true);
        }
    }

    protected void doIntesiveWork() {
        // Below should be your logic that takes lots of time
        try {
            Thread.sleep(10000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}