How to set back button to 2 times click then close screen

how can i set back button in first click load ads , and if clicked two times then close the app

You can do that with a Timer. When clicked the first time set a Variable to true and start the timer with 300ms.

If the Timer runs out set the variable to false.

If the button is clicked when the Variable is true = it is clicked twice.

please can you make a block design for this , i dont know how to work with variables

first method
second method

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