Cursor returns wrong contact id

Question

I have an application which get contact's list and contact details. All data is displayed in two fragments. The main fragment is contain contact list. Where I click on some item it returns contact's id. If I choose first item of list - everything is correct, but if a choose another contact it returns wrong id.

override fun onItemClick(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
        (parent?.adapter as? CursorAdapter)?.cursor?.apply {
            moveToPosition(position)
            val contactId = getLong(CONTACT_ID_INDEX)

            startActivity(Intent(activity, DetailedActivity::class.java).also {
                it.putExtra(SELECTED_CONTACT_INDEX, contactId)
            })
        }
    } 

This is listing of ContactLoader class:

class ContactLoader(private val context: FragmentActivity?) : LoaderManager.LoaderCallbacks<Cursor> {

    private var cursorAdapter: SimpleCursorAdapter? = null

    private val fromColumns: Array<String> = arrayOf(
        ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME_PRIMARY,
        ContactsContract.CommonDataKinds.Phone.NUMBER
    )

    private val toIds = intArrayOf(
        R.id.contact_name,
        R.id.contact_phone
    )

    private val projection: Array<out String> = arrayOf(
        ContactsContract.CommonDataKinds.Phone._ID,
        ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME_PRIMARY,
        ContactsContract.CommonDataKinds.Phone.NUMBER
    )

    fun initContactLoader() {

        cursorAdapter = context?.let {
            LoaderManager.getInstance(it).initLoader(0, null, this)

            SimpleCursorAdapter(
                it,
                R.layout.contact_list_item,
                null,
                fromColumns, toIds,
                0
            )
        }
    }

    fun getAdapter() = cursorAdapter

    override fun onCreateLoader(id: Int, args: Bundle?): Loader<Cursor> = context?.let {
        CursorLoader(
            it,
            ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
            projection,
            null,
            null,
            sortOrder
        )
    } ?: throw IllegalStateException()

    override fun onLoadFinished(loader: Loader<Cursor>, data: Cursor?) {
        cursorAdapter?.swapCursor(data)
    }

    override fun onLoaderReset(loader: Loader<Cursor>) {
        cursorAdapter?.swapCursor(null)
    }

    companion object {
        private const val sortOrder: String =
            "${ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME_PRIMARY} ASC"
    }

}

Answer 1

Solution: I forgot add ContactsContract.CommonDataKinds.Phone.CONTACT_ID into projection. After adding it, I get right id's and all details was displayed correctly.

P.S. Also I changed constant CONTACT_ID_INDEX from 0 to 1