連絡先選択ツール

// Launcher for the Contact Picker intent
val pickContact = rememberLauncherForActivityResult(StartActivityForResult()) {
    if (it.resultCode == Activity.RESULT_OK) {
        val resultUri = it.data?.data ?: return@rememberLauncherForActivityResult

        // Process the result URI in a background thread to fetch all selected contacts
        coroutine.launch {
            contacts = processContactPickerResultUri(resultUri, context)
        }
    }
}
ContactPickerActivity.kt

// Define the specific contact data fields you need
val requestedFields = arrayListOf(
    Email.CONTENT_ITEM_TYPE,
    Phone.CONTENT_ITEM_TYPE,
)

// Set up the intent for the Contact Picker
val pickContactIntent = Intent(ACTION_PICK_CONTACTS).apply {
    putStringArrayListExtra(
        EXTRA_PICK_CONTACTS_REQUESTED_DATA_FIELDS,
        requestedFields
    )
}

// Launch the picker
pickContact.launch(pickContactIntent)
ContactPickerActivity.kt

val requestedFields = arrayListOf(
    Email.CONTENT_ITEM_TYPE,
    Phone.CONTENT_ITEM_TYPE,
)

// Set up the intent for the Contact Picker
val pickContactIntent = Intent(ACTION_PICK_CONTACTS).apply {
    // Enable multi-select
    putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
    // Set limit of selectable contacts
    putExtra(EXTRA_PICK_CONTACTS_SELECTION_LIMIT, 5)
    // Define the specific contact data fields you need
    putStringArrayListExtra(
        EXTRA_PICK_CONTACTS_REQUESTED_DATA_FIELDS,
        requestedFields
    )
    // Enable this option to only filter contacts that have all the requested data fields
    putExtra(EXTRA_PICK_CONTACTS_MATCH_ALL_DATA_FIELDS, false)
}

// Launch the picker
pickContact.launch(pickContactIntent)
ContactPickerActivity.kt

// Data class representing a parsed Contact with selected details.
data class Contact(
    val lookupKey: String,
    val name: String,
    val emails: List<String>,
    val phones: List<String>
)

// Helper function to query the content resolver with the URI returned by the Contact Picker.
// Parses the cursor to extract contact details such as name, email, and phone number.
private suspend fun processContactPickerResultUri(
    sessionUri: Uri,
    context: Context
): List<Contact> = withContext(Dispatchers.IO) {
    // Define the columns we want to retrieve from the ContactPicker ContentProvider
    val projection = arrayOf(
        ContactsContract.Contacts.LOOKUP_KEY,
        ContactsContract.Contacts.DISPLAY_NAME_PRIMARY,
        ContactsContract.Data.MIMETYPE, // Type of data (e.g., email or phone)
        ContactsContract.Data.DATA1, // The actual data (Phone number / Email string)
    )

    // We use `LOOKUP_KEY` as a unique ID to aggregate all contact info related to a same person
    val contactsMap = mutableMapOf<String, Contact>()

    // Note: The Contact Picker Session Uri doesn't support custom selection & selectionArgs.
    // We query the URI directly to get the results chosen by the user.
    context.contentResolver.query(sessionUri, projection, null, null, null)?.use { cursor ->
        // Get the column indices for our requested projection
        val lookupKeyIdx = cursor.getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY)
        val mimeTypeIdx = cursor.getColumnIndex(ContactsContract.Data.MIMETYPE)
        val nameIdx = cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME_PRIMARY)
        val data1Idx = cursor.getColumnIndex(ContactsContract.Data.DATA1)

        while (cursor.moveToNext()) {
            val lookupKey = cursor.getString(lookupKeyIdx)
            val mimeType = cursor.getString(mimeTypeIdx)
            val name = cursor.getString(nameIdx) ?: ""
            val data1 = cursor.getString(data1Idx) ?: ""

            val email = if (mimeType == Email.CONTENT_ITEM_TYPE) data1 else null
            val phone = if (mimeType == Phone.CONTENT_ITEM_TYPE) data1 else null

            val existingContact = contactsMap[lookupKey]
            if (existingContact != null) {
                contactsMap[lookupKey] = existingContact.copy(
                    emails = if (email != null) existingContact.emails + email else existingContact.emails,
                    phones = if (phone != null) existingContact.phones + phone else existingContact.phones
                )
            } else {
                contactsMap[lookupKey] = Contact(
                    lookupKey = lookupKey,
                    name = name,
                    emails = if (email != null) listOf(email) else emptyList(),
                    phones = if (phone != null) listOf(phone) else emptyList()
                )
            }
        }
    }

    return@withContext contactsMap.values.toList()
}
ContactPickerActivity.kt