What’s the meaning of android:progressBarStyle attribute in ProgressBar?

The four attributes that you mention can be applied to a ProgressBar‘s style like so:

style="?android:attr/progressBarStyleHorizontal"

The style constant android:progressBarStyleHorizontal is your typical incremental progress bar:

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While the other three are varying sizes of the same circular progress bar:

style="?android:attr/progressBarStyleSmall"

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style="?android:attr/progressBarStyle"

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style="?android:attr/progressBarStyleLarge"

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Update:

According to adamp’s comments:

These are attributes of the theme that
point at themed styles you can use for
progress indicators…They are not attributes for ProgressBar itself.

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