public static void sendEmail(Context context,final String receiver,final String subject,final String text){
  sendEmail(context,new String[]{receiver},subject,text,null,null,null);
}

public static void sendEmail ( Context context , final String receiver , final String subject , final String text ) { sendEmail ( context , new String [ ] { receiver } , subject , text , null , null , null ) ; }
starts email intent with filled by given receiver , subject and text
