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What are the practical differences between putting a service in a separate process or keeping it in the app's main process? What would each scenario be used for?
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A process is an instance of a particular executable (.exe program file) running. A service is a process which runs in the background and does not interact with the desktop.
remember, android is linux: process = any running program. e.g. something with a PID. service = roughly equivalent to a daemon. something running in the background with no direct user interface.
You can do this by making your own Interface where you declare for example " isServiceRunning() ". You can then bind your Activity to your Service, run the method isServiceRunning(), the Service will check for itself if it is running or not and returns a boolean to your Activity.
When a service is running in the main process it will be stopped in case your application crashes for whatever reason. Put a service into it's own process is reasonable for some services which can be used from different applications or services which should run independently from your main app.
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