Maintaining Progress Bar Visibility with Orientation Change
问题 I have a progress bar (swirly waiting style) defined in xml as: <ProgressBar android:layout_width="wrap_content" android:layout_height="wrap_content" style="@android:style/Widget.Holo.ProgressBar.Large" android:layout_centerVertical="true" android:layout_centerHorizontal="true" android:id="@+id/progress" /> I hide it's visibility in the activity's onCreate method using, progressBar.setVisibility(View.GONE); and start it on a button's onClick event using progressBar.setVisibility(View.VISIBLE)