Global class to register listeners for all the activities in android

Question

I have two Activity classes. Activity A and Activity B. Later on I added Activity C which gets launched when user shakes the device be

Answer 1

Create a main activity class which will be extended by Activity A, B and C. You can register your ShakeListener in this main activity.

Answer 2

You can define your own ActivityStack in Application class, properly manage by adding and removing activities. Finally refer to this stack from activity C.

There is example how ActivityStack works: Back Stack Example

Answer 3

In your case, you need to implement a Service to listen to sensors in the background. Go through documentation:Service

You cannot just use Broadcastreceiver to accomplish this task.

Reference:

Android sensor listening when app in background

Refer this link for help: http://code.tutsplus.com/tutorials/android-barometer-logger-acquiring-sensor-data--mobile-10558