Question

I made an app that makes streaming radio. How can I prevent that, the second time by clicking on the icon to open the app twice?

Answer 1

Here is one good suggestion:

*
How to launch activity only once when app is opened for first time?

What I’ve generally done is add a check for a specific shared
preference in the main Activity: if that shared preference is missing
then launch the single-run Activity, otherwise continue with the main
activity. When you launch the single run Activity create the shared
preference so it gets skipped next time

This solution is slightly different than the question you’re asking, but should give you exactly the result you’re looking for.

Another possibility might be to use android:launchMode = "singleInstance" in your androidmanifest.xml:

• http://www.intridea.com/blog/2011/6/16/android-understanding-activity-launchmode#

IMHO…