If you know how to navigate back from Screen2 to Screen1 and send data back. I.e.: in screen two the user types a text and once it presses system's back button, it navigates back to screen one and that text he typed earlier has to appear now in a textfield in screen1.
You can use BackHandler, it overrides system back button. Here you are an example with navigation with arguments.
As I mentioned in the article it's not the best practice, but like a variant... Better try another approach.
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If you know how to navigate back from Screen2 to Screen1 and send data back. I.e.: in screen two the user types a text and once it presses system's back button, it navigates back to screen one and that text he typed earlier has to appear now in a textfield in screen1.
You can use BackHandler, it overrides system back button. Here you are an example with navigation with arguments.
As I mentioned in the article it's not the best practice, but like a variant... Better try another approach.