How to use

android.widget.ZoomControls

constructor

zoomControls = new ZoomControls(this);
zoomControls.setIsZoomInEnabled(true);
zoomControls.setIsZoomOutEnabled(true);

ZoomControls defaultZoomControls = new ZoomControls(context);
buttonZoomIn = (ZoomButton) defaultZoomControls.getChildAt(1);
buttonZoomOut = (ZoomButton) defaultZoomControls.getChildAt(0);