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after some experiments i think best way is use Force stop button in Application manager
go to Setting > Application manager > WhatsApp and tap Force stop button

As say Here Here:

Android do not kill the apps totally when you exit from it, this button is for close completely the app and remove it from the stack (apps running), also this button free the memory used by the app

so Thanks to User pacoespinozapacoespinoza this is what i want to do!

after some experiments i think best way is use Force stop button in Application manager
go to Setting > Application manager > WhatsApp and tap Force stop button

As say Here:

Android do not kill the apps totally when you exit from it, this button is for close completely the app and remove it from the stack (apps running), also this button free the memory used by the app

so Thanks to User pacoespinoza this is what i want to do!

after some experiments i think best way is use Force stop button in Application manager
go to Setting > Application manager > WhatsApp and tap Force stop button

As say Here:

Android do not kill the apps totally when you exit from it, this button is for close completely the app and remove it from the stack (apps running), also this button free the memory used by the app

so Thanks to User pacoespinoza this is what i want to do!

1
source | link

after some experiments i think best way is use Force stop button in Application manager
go to Setting > Application manager > WhatsApp and tap Force stop button

As say Here:

Android do not kill the apps totally when you exit from it, this button is for close completely the app and remove it from the stack (apps running), also this button free the memory used by the app

so Thanks to User pacoespinoza this is what i want to do!