Calling method in host from gridview adapter

I have a gridview that is filled with several images using a custom adapter. The adapter item that shows the images have a download button. What I want to do is to send a method to the custom adaptar that should be called when the user presses the download button. In summary: onlinegallery-> associate gridview with adapter sending an onlinegallery method as parameter gridview adapter -> shows several item.xml each containing an image and a button. item button -> when pressing the button, the onlinegallery method should be called indicating the image to download.

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