Page fit & default zoom mode in Android

PDFViewCtrl's page view mode controls the default zoom level of pages and documents. New documents will automatically open at the zoom level specified by the mode.

PDFViewCtrl supports the following page view modes:

Page view mode	Description	Screenshot-portrait	Screenshot-landscape
PageViewMode.FIT_PAGE	The zoom is set so that the entire page is visible without scrolling.
PageViewMode.FIT_WIDTH	The zoom is set so that the page's width matches the viewer's width.
PageViewMode.FIT_HEIGHT	The zoom is set so that the page's height matches the viewer's height.
PageViewMode.ZOOM	The viewer's zoom is not adjusted based on the page.

You can set a default page fit mode in your PDFViewCtrl by using setPageRefViewMode(PageViewMode).

If you want to dynamically change the page fit mode, use setPageViewMode(PageViewMode). Note that when the user flips the page, the page view mode will be automatically reset to the default mode set by setPageRefViewMode.

mPdfViewCtrl.setPageViewMode(PDFViewCtrl.PageViewMode.FIT_WIDTH);

It is also possible to maintain the zoom level when switching pages.

PDFViewCtrl allows users to zoom in and out with touch gestures. To maintain zoom level when flipping pages, call setMaintainZoomEnabled(boolean). Note that when you double tap PDFViewCtrl will end zooming and reset the page view mode to preferred page view mode. To set preferred page view mode, callsetPreferredViewMode(PageViewMode).

private PDFViewCtrl mPdfViewCtrl;
// ...
private void zoomSettingSample() throws PDFNetException {
    // Enable maintain zoom level
    mPdfViewCtrl.setMaintainZoomEnabled(true);
    // Set preferred view mode to PageViewMode.FIT_PAGE
    mPdfViewCtrl.setPreferredViewMode(PDFViewCtrl.PageViewMode.FIT_PAGE);
    // Set PageViewMode.FIT_PAGE to current page view mode
    mPdfViewCtrl.setPageViewMode(PDFViewCtrl.PageViewMode.FIT_PAGE);
}