is there any option that i can declare public variable-
such as int,and to be seen in other class in my other activity.When i

This would normally be done by using a static boolean / int in a class designed simply for holding 'global' data.

public class AppSettings
{
   public static boolean playSounds = true ;

}

Now any class should be able to access it:

AppSettings.playSounds = false ;

if (AppSettings.playSounds)
   // do something.

etc.


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