How to show a progress bar inside a layout? - android

i am using a custom notification layout. Notification layout is inside an activity. Notification layout does not fill the entire portion of the screen. It takes only 1/4 of the screen. I want to show the progress bar inside the notification layout.so my question is
How to set the position of progress bar(other than using
(ProgressDialog.getWindow().setGravity(Gravity.CENTER);)
Can we set the width and height of progress bar( atleast to the size of the layout)
Any help is highly appreciable.

"How to set the position of progress bar": use it like any other types of View (xml will be simpler).
"Can we set the width and height of progress bar( at least to the size of the layout)":
android:maxHeight An optional argument to supply a maximum height for thisview.
android:maxWidth An optional argument to supply a maximum width for this view.
android:minHeight

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