[android] Sending message through WhatsApp

Simple solution, try this.

String phoneNumberWithCountryCode = "+62820000000";
String message = "Hallo";

startActivity(
    new Intent(Intent.ACTION_VIEW,
        Uri.parse(
            String.format("https://api.whatsapp.com/send?phone=%s&text=%s", phoneNumberWithCountryCode, message)
        )
    )
);

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