public void showWaContact(){
        try{
            String contactWaNumber = "6281363009995";
            Intent sendIntent = new Intent("android.intent.action.MAIN");
            sendIntent.setComponent(new ComponentName("com.whatsapp","com.whatsapp.Conversation"));
            sendIntent.putExtra("jid", contactWaNumber+"@s.whatsapp.net");
            startActivity(sendIntent);
        }catch (Exception e){
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=com.whatsapp")));
        }
    }