Kotlin Standard Library Cookbook

How to do it...

1. Implement an extension function that allows us to fetch the values of a requested column name from Cursor:

fun Cursor.getString(columnName: String): String? {    return getString(getColumnIndex(columnName))}

2. Obtain the Cursor instance that points to the system contacts table:

val NOT_SPECIFIED = ""val content = getContext().contentResolverval projection = arrayOf(ContactsContract.Data.DISPLAY_NAME)val cursor =        content.query(ContactsContract.Contacts.CONTENT_URI,                projection,                NOT_SPECIFIED,                emptyArray(),                NOT_SPECIFIED)

3. Invoke the use function on the cursor instance and iterate through the data inside its scope:

val NOT_SPECIFIED = ""val content = getContext().contentResolverval projection = arrayOf(ContactsContract.Data. ...