Android uses URI strings both for requesting data (e.g., a list of contacts) and for
requesting actions (e.g., opening a Web page in a browser). Both are valid URI strings, but

have different values. All requests for data must start with the string ―content://‖. Action

strings are valid URIs that can be handled appropriately by applications on the device; for

example, a URI starting with ―http://‖ will be handled by the browser.