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android activity circle not showing up

view story
linux-howto

http://stackoverflow.com – the xml <?xml version="1.0" encoding="utf-8"?> <uk.co.senab.actionbarpulltorefresh.library.PullToRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/ptr_layout"> <ListView android:id="@+id/ptr_listview" android:layout_width="match_parent" android:layout_height="match_parent"/> <LinearLayout android:id="@+id/ptr_layout_progressbar" android:layout_width="match_parent" android:layout_heigh (HowTos)