Android Floating popup 'window' options?

I wish to have an 80% by 80% sized view popup, grey out the background and take focus?

In essence it's a "sub" view that is model.

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You can use an activity with the dialog theme by specifying it in the manifest like this:

<activity android:theme="@android:style/Theme.Dialog">

This will cause it to be a popup as described. To achieve the 80% x 80%, you need to configure your activity's layout to take up that much space.