Activity Starter automatically back to screen 1

to launch an website with activity starter , and use the back button for getting home to screen 1 is quiet ok,

but to do this after a time is over or getting a sms with the right text i did not find any way.. 

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yes exactly, if you use the activity starter to start another app, that other app has the control and the only way to go back to your app is to use the back button

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No other way ? Like after a while or a special Text from SMS?

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to launch an website with activity starter 

use the webviewer instead

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