how can i show start key and pause my application until user press start key ?
i want to show start key if user press it, application running.
i dont want to user another activity and want to use one activity
Welcome to the forum.
I recommend that you start by reading the beginners guides written by Klaus, you will learn a lot about buttons, layouts and activities by reading it.
You will find examples in there for what you need to learn which is the very basics to your question. Add buttons and starting activities on user press or interactions.
There's also plenty of example code in this forum on how to do what you want.