How to start a Skype call from an Android app?

I'm trying to start a Skype intent from my Android App, passing a phone number. So far, thanks to other people who ad similiar needs here on stackoverflow, I've managed to start skype, but still I can't pass the phone number. This is the code I'm using:

Intent sky = new Intent("android.intent.action.CALL_PRIVILEGED");
        sky.setClassName("com.skype.raider",
                "com.skype.raider.Main");
        sky.setData(Uri.parse("tel:" + number));
        Log.d("UTILS", "tel:" + number);
        ctx.startActivity(sky);

What's happening is that skype starts, but gives me a toast saying that the number is not valid, and suggests me to add the international prefix. The Log.d gives me tel:+39........ (the number works, I'm using it also for

public static void call(String number, Context ctx) {
    try {
        Intent callIntent = new Intent(Intent.ACTION_CALL);
        callIntent.setData(Uri.parse("tel:" + number));
        ctx.startActivity(callIntent);
    } catch (ActivityNotFoundException e) {
        Log.e("helloandroid dialing example", "Call failed", e);
    }

}

In fact, when I go to the Skype's view for calling, I see it's been composed +0 So what it seems to me is that I'm passing the phone number in the wrong way, or to the wrong Activity....any help would be very appreciated! In the meantime, I just want to say that StackOverflow simply rocks.

See this answer: https://stackoverflow.com/a/8844526/819355

Jeff suggests using a skype:<user name> instead of tel:<phone number>

After some studing of the skype apk with apktool, as suggested in that answer, I came up with this code, for me it's working:

public static void skype(String number, Context ctx) {
        try {
            //Intent sky = new Intent("android.intent.action.CALL_PRIVILEGED");
            //the above line tries to create an intent for which the skype app doesn't supply public api

                Intent sky = new Intent("android.intent.action.VIEW");
            sky.setData(Uri.parse("skype:" + number));
            Log.d("UTILS", "tel:" + number);
            ctx.startActivity(sky);
        } catch (ActivityNotFoundException e) {
            Log.e("SKYPE CALL", "Skype failed", e);
        }

    }