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if (PermissionChecker.checkSelfPermission(this, Manifest.permission.PACKAGE_USAGE_STATS) != PermissionChecker.PERMISSION_GRANTED) {
startActivity(Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS))
}
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navController.currentBackStackEntry?.savedStateHandle?.getLiveData<Boolean>(TestFragment.SUCCESS_KEY)?.observe(viewLifecycleOwner) { result -> run { ... }Fragment B
navController.previousBackStackEntry?.savedStateHandle?.set(SUCCESS_KEY, success)
navController.popBackStack()
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