1.聯絡人權限

<uses-permission android:name="android.permission.READ_CONTACTS"/>

2.聯絡人工具類

import android.content.ContentResolver
import android.net.Uri
import android.provider.ContactsContract

object ContactUtil {

    //獲取所有聯絡人
    fun getContacts(contentResolver: ContentResolver): List<Contact>? {
        val contacts = ArrayList<Contact>()
        val uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI
        val projection = arrayOf(
            ContactsContract.CommonDataKinds.Phone.NUMBER,
            ContactsContract.Contacts.DISPLAY_NAME
        )
        try {
            contentResolver.query(uri, projection, null, null, null).use { cursor ->
                var phoneNum: String
                var name: String
                cursor?.apply {
                    if (count > 0) {
                        while (moveToNext()) {
                            phoneNum =
                                getString(getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER))
                            name =
                                getString(getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME))
                            phoneNum = phoneNum.replace("^(\\+886)".toRegex(), "0")
                            phoneNum = phoneNum.replace("^(886)".toRegex(), "0")
                            phoneNum = phoneNum.replace("-".toRegex(), "")
                            phoneNum = phoneNum.replace(" ".toRegex(), "")
                            phoneNum = phoneNum.trim { it <= ' ' }
                            val contact = Contact(name,phoneNum)
                            contacts.add(contact)
                        }
                    }
                }
            }
        } catch (e: Exception) {
            e.printStackTrace()
        }
        return contacts
    }

    //關鍵字過濾
    fun getFilterData(filter: String?, contentResolver: ContentResolver): List<Contact>? {
        val contacts = ArrayList<Contact>()
        val uri =
            Uri.withAppendedPath(ContactsContract.CommonDataKinds.Phone.CONTENT_FILTER_URI, filter)
        val projection = arrayOf(
            ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
            ContactsContract.CommonDataKinds.Phone.NUMBER
        )
        try {
            contentResolver.query(uri, projection, null, null, null).use { cursor ->
                var phoneNum: String
                var name: String
                cursor?.apply {
                    if (count > 0) {
                        while (moveToNext()) {
                            phoneNum =
                                getString(getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER))
                            name =
                                getString(getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME))
                            phoneNum = phoneNum.replace("^(\\+886)".toRegex(), "0")
                            phoneNum = phoneNum.replace("^(886)".toRegex(), "0")
                            phoneNum = phoneNum.replace("-".toRegex(), "")
                            phoneNum = phoneNum.replace(" ".toRegex(), "")
                            phoneNum = phoneNum.trim { it <= ' ' }
                            val contact = Contact(name, phoneNum)
                            contacts.add(contact)
                        }
                    }
                }
            }
        } catch (e: java.lang.Exception) {
            e.printStackTrace()
        }
        return contacts
    }

    data class Contact(var name: String, var phone: String)
}

3.效果展示

    private val READ_CONTACT_REQUEST = 40

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        if (ContextCompat.checkSelfPermission(this,Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
            requestPermissions(arrayOf(Manifest.permission.READ_CONTACTS), READ_CONTACT_REQUEST)
        } else {
            getContact()
        }
    }

    private fun getContact() {
        val contacts = ContactUtil.getContacts(contentResolver)
        contacts?.also {
            contact ->
            for (index in contact.indices) {
                val name = contact[index].name
                val phone = contact[index].phone
            }
        }
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == READ_CONTACT_REQUEST && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            getContact()
        }
    }