Contacts

1- Class contact avec constructeur principal
2- gradle
3- manifest
4- function contacts
Ps: check
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class Contact
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class Contact(var number: String,   var name: String) 

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build gradle
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    implementation 'com.karumi:dexter:6.2.3'
    
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permissions in Manifest
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    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.WRITE_CONTACTS" />
    
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function in MainActivity
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   fun getContactListFromLocal() {



                val myContacts: MutableList<Contact?> =
                    ArrayList<Contact?>()

                // Get query phone contacts cursor object.
                val readContactsUri =
                    ContactsContract.CommonDataKinds.Phone.CONTENT_URI
                val cursor: Cursor =
                    this@MainActivity.getContentResolver()
                        .query(readContactsUri, null, null, null, null)!!
                if (cursor != null) {
                    cursor.moveToFirst()

                    // Loop in the phone contacts cursor to add each contacts in phoneContactsList.
                    do {
                        // Get contact display name.
                        val displayNameIndex =
                            cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)
                        if (displayNameIndex != -1) {
                            val userDisplayName = cursor.getString(displayNameIndex)

                            // Get contact phone number.
                            val phoneNumberIndex =
                                cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)
                            var phoneNumber = cursor.getString(phoneNumberIndex)
                            phoneNumber = phoneNumber!!.replace("-", "")
                            phoneNumber = phoneNumber.replace(" ", "")
                            val regex: String = "^[+]?[(]?[0-9]{3}[)]?[-\\\\.]?[0-9]{3}[-\\\\.]?[0-9]{4,6}\$"
                            val pattern = Pattern.compile(regex)
                            val matcher = pattern.matcher(phoneNumber)
                            var contact: Contact? = null
                            if (matcher.matches() && userDisplayName != null && !userDisplayName.isEmpty()
                                && phoneNumber != null && !phoneNumber.isEmpty()
                            ) {
                                contact = Contact(userDisplayName, phoneNumber)
                            }
                            myContacts.add(contact)
                        }
                    } while (cursor.moveToNext())
                }

             runOnUiThread {
                 Toast.makeText(this@MainActivity, " first contact  "+myContacts.get(0)?.number, Toast.LENGTH_LONG).show()
             }


    }