Share to Whatsapp using ImageButton android

I wanna share text to whatsapp using ImageButton, but I don't know how to set the ImageButton to share the text.

Here is my code

ImageButton wasap = (ImageButton) findViewById(R.id.wasapKongsi);
    Intent whatsappIntent = new Intent(Intent.ACTION_SEND);
    whatsappIntent.setType("text/plain");
    whatsappIntent.setPackage("com.whatsapp");
    whatsappIntent.putExtra(Intent.EXTRA_TEXT, R.id.hadisView + "/n" + R.id.textView);
    try {
        startActivity(whatsappIntent);
    } catch (android.content.ActivityNotFoundException ex) {
        Toast.makeText(hadis.this, "Whatsapp have not been installed.", Toast.LENGTH_LONG).show();
    }

I hope anyone here can help me. Thanks