public static void PostMessage(ServiceType type, string text, string url)
{
string packageName = string.Empty;
if(type.Equals(ServiceType.Twitter)){
packageName = "com.twitter.android";
}else if (type.Equals(ServiceType.Facebook)){
packageName = "com.facebook.katana";
}
AndroidJavaObject intent = new AndroidJavaObject ( "android.content.Intent" );
intent.Call<AndroidJavaObject> ( "setPackage", packageName );
intent.Call<AndroidJavaObject> ( "setType", "text/plain" );
intent.Call<AndroidJavaObject> ( "putExtra", "android.intent.extra.TEXT" , text + "\t" + url );
activity.Call ("startActivity", intent.CallStatic<AndroidJavaObject>( "createChooser", intent, "Sorry" ));
intent.Dispose ();
}