Hi,
I have a doubt about android services and how to properly use them. I
will formulate my question by firstly explaining a scenario of an
application.
1) The application has to get current data of different sensors and
networks such as GPS, acceleration, orientation, magnetic field,
bluetooth/NFC stream, gsm/wifi network information etc.
2) There could be 1 or more data streams monitored at once at a
different rate, for example monitoring GPS data would be at much lower
rate than acceleration, however all the values will be related after
that.
3) There are 2 modes: monitoring mode and recording mode. When using
the second one the application has to continue recording even after
main activity is finished(foreground service) until not terminated by
the user.
I would like to say that I have read all the documents on this and
also a lot of forums but didn't obtain any certain answers from that.
So I will divide this questions in some sub questions:
Q1) What is the bast way to do the monitoring part only which has to
share data between activities.
Option1: using parcelable objects to send between activities and
starting new Sensor/GPS Listeners on every new activity. (note that
there could be external blue tooth sensors which implies bluetooth
connection each time)
Option2: using a service which will collect all the data and current
statistics and share to activities
(Q2,3 and 4 are quite related.)
Q2) What is the best Service Approach in terms of stability and
performance (we don't want the service to get accidentally killed and
for example static variables lost).
Option1: Using a service on a separate thread using AIDL interface
Option2: Using a service on the same thread but start heavy processes
(such as bluetooth connection) on a separate thread inside the servise
Q3) What is the best way of communicating with a service
Option1: AIDL interface
Option2: callbacks to/from the service
Option3: Using a content observer
Option4: Using static variables in the service
Option5: Using messages
Q4) What is the best way of get announcements from a service
Option1: Callbacks from the service
Option2: Using a content observer
Option3: Using messages
Option4: Using Broadcasting
Again my aim is to consider for Stability and Performance, thus I am
looking for specific reasons why one method is better than the other.
Thank you for your help!
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