问题
I am writing an application that shows "Japanese Traditional Time" (JTT for short). There are several components (notification, widgets, application itself, alarms) which all use the same data - current JTT.
My current version uses a single service that does all the calculation and uses a Handler to notify everyone about "ticking", mimicking ACTION_TIME_TICK.
However with alarms I need to also have a way to translate "usual time" to JTT and vice versa. The calculations are quite CPU-heavy (it's all based on sunrises and sunsets) and thus I prefer having it all done in a single place and then cached (calculating stuff knowing sunrise and sunset times is not as heavy).
So I have several ways to do that now:
- Keep it all in Service
- And use binding to request the data I need. It's actually already done in one case and seems a bit cumbersome since I have to handle asynchronous responses
- Move to content provider
- And use content observers instead of broadcasting
- Or send broadcasts from provider
- Combine both ways
- Use content provider to calculate the data for service which in turn will broadcast it when needed
Which would be better? Maybe something else?
回答1:
Content providers are for structured data, so it doesn't really fit your use case. Not sure what you mean by 'asynchronous responses'? Calling a remote service is usually just like a local function call, it will block and return a value when done. If you have to notify multiple components a broadcast is the way to go. Explore using a LocalBroadcast if all components are in the same process (check Android support library source), or set a permission on it to make sure other apps cannot get it if you need to send a system-wide (regular) one.
回答2:
I'm sticking with "just service" - I have discovered Sticky Broadcasts which actually cover the problem I had with common Broadcasts (having to request latest data from service after registering but before getting the first "tick") and that leaves me with much less cases where I need actual service connection.
来源：https://stackoverflow.com/questions/13843105/contentprovider-or-service