OsmAnd/OsmAnd-telegram/res/layout/action_progress_bar.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:paddingRight="@dimen/content_padding_standard"
    android:paddingLeft="@dimen/content_padding_standard">

    <ProgressBar
        android:layout_width="@dimen/progress_bar_size_small"
        android:layout_height="@dimen/progress_bar_size_small" />

</LinearLayout>