Android/kotlin/Alert

okのみ

AlertDialog.Builder(context)
    .setTitle("タイトル１")
    .setMessage("文章１")
    .setPositiveButton("OK") { dialog, which ->
        Log.i("AlertDialog", "OK")
    }
    .show()

ok,cancelの２択

AlertDialog.Builder(context)
    .setTitle("タイトル１")
    .setMessage("文章１")
    .setPositiveButton("OK") { dialog, which ->
        Log.i("AlertDialog", "OK")
    }
    .setNegativeButton("Cancel"){ dialog, which ->
        Log.i("AlertDialog", "Cancel")
    }
    .show()

枠外クリックでキャンセル防止

setCancelable(false)を追加

 AlertDialog.Builder(this)
     .setCancelable(false)

参考：http://nishi.sunnyday.jp/Knowledge/Android/tips/AlertDialog/setCancelable