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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) //At least KitKat
    {
        String defaultSmsPackageName = Telephony.Sms.getDefaultSmsPackage(activity); //Need to change the build to API 19

        Intent sendIntent = new Intent(Intent.ACTION_SEND);
        sendIntent.setType("text/plain");
        sendIntent.putExtra(Intent.EXTRA_TEXT, smsText);

        if (defaultSmsPackageName != null)//Can be null in case that there is no default, then the user would be able to choose any app that support this intent.
        {
            sendIntent.setPackage(defaultSmsPackageName);
        }
        activity.startActivity(sendIntent);

    }
    else //For early versions, do what worked for you before.
    {
        Intent sendIntent = new Intent(Intent.ACTION_VIEW);
        sendIntent.setData(Uri.parse("sms:"));
        sendIntent.putExtra("sms_body", smsText);
        activity.startActivity(sendIntent);
    }