You can change the language for the OK, Google service to both recognize and speak Arabic. You can access these settings from the Google app on your device. You can find this in the upper-left corner of the Google app. You can also swipe in from the left side of the screen. This will open the Google settings menu. This will open the voice settings for OK, Google. You'll find this option at the very top of the Voice menu. You'll have a few different voices to choose from. This voice will read back your "OK, Google" results, and will enable you to use "OK, Google" in Arabic. You'll need to stay connected to the internet in order to use "OK, Google" in Arabic, as the Arabic files are not available for offline speech recognition at the time of this writing in October 2016.

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Write a summary of the previous text in Indonesian:
Sentuh ikon aplikasi Google. Sentuh tombol menu (☰). Sentuh "Settings" pada menu aplikasi Google. Sentuh “Voice”. Pilih "Languages". Geser layar untuk menemukan opsi bahasa Arab. Tandai kotak pada opsi suara yang ingin digunakan.