Android - Start activity without launching?

For instance: I have 2 activities. Activity A and B. Activity B starts a service as soon it gets launched.

But I want to start the service through activity A, so I need to somehow start Activity B from A without showing it on screen Step #1: Call startService() in Activity A Step #2: There is no step #2 If you want to have some common code, where either Activity A or Activity B can start the service, create a static method, or create a base class that both A and B inherit from.

For instance: I have 2 activities. Activity A and B. Activity B starts a service as soon it gets launched.

But I want to start the service through activity A, so I need to somehow start Activity B from A without showing it on screen Step #1: Call startService() in Activity A. Step #2: There is no step #2. If you want to have some common code, where either Activity A or Activity B can start the service, create a static method, or create a base class that both A and B inherit from.

Yeah but the problem is that the Service uses a method inside Activity B. And if I use startService() from Activity A, I get a nullpointerexception, because the values in Activity B haven't been initiated. – Carnal Apr 26 at 13:05 1 @Carnal: "Yeah but the problem is that the Service uses a method inside Activity B" -- get rid of that.

You should never be doing that. To clarify, a Service should not be trying to call methods on an Activity. The Activity can be destroyed at any point by Android.

If a Service can reach the Activity, you have a memory leak. I guarantee you that there are better solutions for whatever problem you are trying to solve this way. – CommonsWare Apr 26 at 13:18 My problem that is close to the first one is to start my application an an activity that the User choose.So typically, I start ActivityA by default, than ActivityA check preferences and Launch ActivityB,C,D... than ActivityA close.

How can I achieve this? – Profete162 Apr 26 at 13:46.

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