游标返回错误的联系人ID

Question

我有一个获取联系人列表和联系方式的应用程序。所有数据都显示为两个片段。主要片段是包含联系人列表。当我单击某些项目时，它将返回联系人的ID。如果我选择列表的第一项-一切正确，但是如果选择另一个联系人则返回错误的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)
            })
        }
    } 

这是ContactLoader类的列表：

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：我忘记将ContactsContract.CommonDataKinds.Phone.CONTACT_ID添加到投影中。添加后，我得到正确的ID，所有详细信息均正确显示。