How to get an Alertdialog with the background out of focus (fuzzy).

Question

I know how to make AlertDialog's of various types. But, how can I make an AlertDialog with the background fuzzy as if it is out of focus (i.e. like using a telephoto lens)?

Whenever I search for 'focus' the result relaits to something like the onFocus commands, etc. which isn't what I mean.

An example would be if you press the power button on your phone, a list pops up and the background goes fuzzy.

Answer 1

That is not an AlertDialog itself, it's a plain Activity themed as Dialog.

You need a simple Activity and in manifest file just add android:theme="@android:style/Theme.Dialog"

<activity android:name=".utils.TextEntryActivity"
            android:label="Type in the value" android:theme="@android:style/Theme.Dialog" />