{ } public void addCompletionListener( DownloadCompletionListener l ) { notSupported(); } public void removeCompletionListener( DownloadCompletionListener l ) { notSupported(); } public void addTrackerListener( DownloadTrackerListener l ) { } public void addTrackerListener( DownloadTrackerListener l, boolean immediateTrigger) { } public void removeTrackerListener( DownloadTrackerListener l ) { } public void addDownloadWillBeRemovedListener( DownloadWillBeRemovedListener l ) { notSupported(); } public void removeDownloadWillBeRemovedListener( DownloadWillBeRemovedListener l ) { notSupported(); }