Time critical apps in Android?

[KMatle]

Earlier I saw some comparison between iOS and Android depending on midi-player apps which need to be very accurate in time synching. iOS would be "much better here" (don't know why).

Any ideas how to develop time critical apps in Android (e.g. exactly every second som sub is called)?

 

[stevel05]

With multi threaded / multi tasking environments, it would be impossible to ensure that the timing is exact. Unless you were coding at the system level, in which case it would wreak havoc with the overall timing of other processes.

When porting the midi library I used the same method that is used in the standard Java version. Which is to check the required timing against elapsed time. That way if one of the calls was slightly out for what ever reason, it would sync itself again on the next call. For audio, a discrepancy in the order of 20 ms would not be noticed as long as it doesn't have a cumulative effect.

 

[Erel]

You need to define "exactly". If an error of a few milliseconds is acceptable then you can use a regular timer. Set its interval to be a bit shorter than the exact interval and add a busy loop to wait until the exact time.