我有一个缓慢的启动和黑屏的问题，当获取联系人信息到RecyclerView.而且，删除过程时，问题消失了.下面是getContacts的功能，如果有人可以帮助.谢谢你...

private fun getContactList() {
        val uri: Uri = ContactsContract.Contacts.CONTENT_URI
        // Sort by ascending
        val sort: String = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME+" ASC"
        // Initialize Cursor
        val cursor: Cursor = requireActivity().contentResolver.query(uri, null, null, null, sort)!!
        // Check condition
        if (cursor.count > 0) {
            while (cursor.moveToNext()) {
                val id: String = cursor.getString(cursor.getColumnIndexOrThrow(ContactsContract.Contacts._ID))
                val name: String = cursor.getString(cursor.getColumnIndexOrThrow(ContactsContract.Contacts.DISPLAY_NAME))
                val img: String = getPhotoUriFromID(id).toString()
                val phoneUri: Uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI
                val selection: String = ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" =?"
                // Initialize phone cursor
                val phoneCursor: Cursor = requireActivity().contentResolver.query(phoneUri, null, selection,
                    arrayOf(id), null)!!
                // Check condition
                if (phoneCursor.moveToNext()) {
                    val number: String = phoneCursor.getString(phoneCursor
                        .getColumnIndexOrThrow(ContactsContract.CommonDataKinds.Phone.NUMBER))
                    // Initialize Contact Model
                    val model = ContactModel(name, number, img)
                    contactArr.add(model)
                    groupListAdapter.notifyDataSetChanged()
                    // Close Phone Cursor
                    phoneCursor.close()
                }
            }
            // Close Cursor
            cursor.close()
        }
    }