jpaone gave a great solution to the depreciated Fragment::startActivityForResult() in this chapter.
His solution works great, and he provided a lot of explanation as to what is going on, but it can be a lot simpler with a PickContact default contract. There are a lot of default contracts for other uses. You can find more default contracts here. And I’ve used another of the default contracts in the next chapter to help take a photo, described here.
Don’t bother creating the variables pickContactContract, pickContactCallback or pickContactLauncher.
Instead in the CrimeFragment::onStart function set up the suspect button click listener to use an ActivityResultLauncher named pickContact like this:
override fun onStart() {
super.onStart()
......
suspectButton.apply {
setOnClickListener {
pickContact.launch(null)
}
}
}
val pickContact = registerForActivityResult(ActivityResultContracts.PickContact()) { contactUri ->
val queryFields = arrayOf(ContactsContract.Contacts.DISPLAY_NAME)
val cursor = contactUri?.let {
requireActivity().contentResolver.query (it, queryFields, null, null, null)
}
cursor?.use {
// Verify cursor contains at least one result
if (it.count > 0) {
// Pull out first column of the first row of data, that's our suspect name
it.moveToFirst()
val suspect = it.getString(0)
crime.suspect = suspect
crimeDetailViewModel.saveCrime(crime)
suspectButton.text = suspect
}
}
}