Android how to open last screen on resume

Issue

This is more of an advice thread so I can't share any code because I have none.

My question is the following:

I have an android app that uses a nav graph and if I leave the app with the system back button it will always open the login screen on resume. So I didn't close the app, I just put it into the background. My start destination is indeed set to this login fragment, but what must I change that the app would open on the screen I close the app on? In this case, it was the screen after login which in my case can point to 2 different fragments, so I can't just hardcode it.

Solution

Yes, you can do it using SharedPreference.

1. In the login fragment make a shared preference and set its value to a boolean.

val sharedPreferences:SharedPreferences = this.requireActivity().getSharedPreferences("OnboardingDetails", Context.MODE_PRIVATE)

        val boarded: Boolean = sharedPreferences.getBoolean("isLogin", false)

        if (boarded) {
            findNavController().navigate(OnboardingFragmentDirections.actionOnboardingFragmentToTransactionListFragment())
        } else {
            sharedPreferences.edit().putBoolean("isLogin", true).apply()
        }

1. The first time the login screen comes when a user installs the app, the boolean is false.
2. else part of the condition executes making the boolean true. This means the user has already gone through the login screen.
3. When the next time user opens your app, The boolean is true and if part of the condition runs that takes the user to the next fragment automatically.

Answered By - Karmveer Singh