how can i detect touch event started in other activity?
I am trying to make my own launcher.
For that I made 'app box' and 'home screen' in each activity.
for now I am implementing a function that creates icon on 'home screen'.
When a user press an icon on the 'app box' for a while, It moves onto the 'home screen' with disappearing 'app box' activity.

But I can't get touch event started in 'app box' activity. 
(ACTION_DOWN occured in 'app box'. I want get ACTION_MOVE and ACTION_UP event on 'home screen')
How can I detect the touch event started in other activity continuously? 
Thanks in advance.
how can i detect touch event started in other activity?
===

I am trying to make my own launcher.
For that I made 'app box' and 'home screen' in each activity.
for now I am implementing a function that creates icon on 'home screen'.
When a user press an icon on the 'app box' for a while, It moves onto the 'home screen' with disappearing 'app box' activity.

But I can't get touch event started in 'app box' activity. 
(ACTION_DOWN occured in 'app box'. I want get ACTION_MOVE and ACTION_UP event on 'home screen')
How can I detect the touch event started in other activity continuously? 
Thanks in advance.