Is there a significant difference in time needed for sending data over a service or by using an intent?
Are there general advices when to use service and when to use intents?
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Is there a significant difference in time needed for sending data over a service or by using an intent?
Are there general advices when to use service and when to use intents?
These are two completely different things. The question isn’t which is faster, but what you are trying to do.
If you want to transfer data from one activity to another, you pass it through the intent. If this is not sufficient for you (too much data for example), you can take other approaches but they will not involve a Service. For example, you may have a singleton holding your shared data, which both activities access… but be extremely careful about your process being killed at various points which causes the singleton to go away (and using a Service for this won’t let you get away with not dealing with such a situation).
A Service is to do some work in the background even if the user isn’t directly interacting with the app. Especially if we are talking about stuff within one .apk (and thus typically one process), there are very few other reasons to use a Service.