Android intent-filter URL, close other Activities

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http://stackoverflow.com – Currently I'm working on a project. It opens a weburl, with zxing I can scan bar codes and zxing returns an intent to open an URL. There I select my own App. But now I got a new Activity started? And the back button will close this Activity and go back to the prev Activity (ZXing scan) and back opens up my start page. But I only want 1 webview to be open at a time. So when I receive a incomming Intent, I only want to have 1 Activity open. How can I do this? So I need some help getting the following flow: Open my app Load initial page in webview scan with zxing Open URL in my App, but don (HowTos)