Implement Share Intent

[srowen]

Most of the time I want to forward a scanned URL (or some other data) somewhere so I can later check it out, usually with a laptop. This is currently not that easy:

1. Scan a QR code URL
2. Barcode Scanner shows buttons to open browser, share with email or SMS

Have a Share UI element which shows all the apps registered for sharing

A workaround currently is to open the scanned link in the browser and select "Share Page" which gives the option to share the link with a multitude of apps, including email and SMS.

However, this requires many steps and is slow and inconvenient. In some cases the browser gets redirected to a mobile site making it impossible to share the original URL. Sometimes the browser can't even open the URL, or proceeds to download the content.

Ported from https://code.google.com/p/zxing/issues/detail?id=1402