download files and use in application

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http://stackoverflow.com – I am beginning developing android, I have read a lot in the last days. need for collaboration. I need something to download images, videos and pdfs. always with a link or an array of links. these downloaded files must be saved in a folder on the device. My device does not have sdcard. the files should be downloaded and used in imageview videoview and pdfs should be sent by email. (send files by email as I know I do). need some tutorials, examples, something for me to start developing. something very practical and easy understanding. good to know I can count on you guys. I have no one else to (HowTos)