Show and hide existing annotations in Android

By default, PDFViewCtrl shows all annotations on PDF document. If you want to hide a particular annotation on PDFViewCtrl, or hide all annotations on PDFViewCtrl, you can hide annotations as follows:

Show and hide one annotation

To show a hidden annotation in PDFViewCtrl, call showAnnotation(Annot):

Java

public static void showAnnotation(PDFViewCtrl pdfViewCtrl, Annot annot, int annotPageNum) {
  pdfViewCtrl.showAnnotation(annot);
  pdfViewCtrl.update(annot, annotPageNum);
}

Kotlin

fun showAnnotation(pdfViewCtrl: PDFViewCtrl, annot: Annot, annotPageNum: Int) {
    pdfViewCtrl.showAnnotation(annot)
    pdfViewCtrl.update(annot, annotPageNum)
}

To hide an annotation in PDFViewCtrl, call hideAnnotation(Annot).

Java

public static void hideAnnotation(PDFViewCtrl pdfViewCtrl, Annot annot, int annotPageNum) {
  pdfViewCtrl.hideAnnotation(annot);
  pdfViewCtrl.update(annot, annotPageNum);
}

Kotlin

fun hideAnnotation(pdfViewCtrl: PDFViewCtrl, annot: Annot, annotPageNum: Int) {
    pdfViewCtrl.hideAnnotation(annot)
    pdfViewCtrl.update(annot, annotPageNum)
}

After hide and show an annotation in PDFViewCtrl, You must call update to redraw the area covered with the given annotation.

Show and hide all annotations

Alternatively, you can show/hide all annotations in PDFViewCtrl by calling setDrawAnnotations(boolean). This method toggles the visibility of annotations and form fields.

For example, disabling all annotations and form fields from rendering:

Java

try {
    pdfViewCtrl.setDrawAnnotations(false);
    pdfViewCtrl.update(true);
} catch (PDFNetException e) {
    e.printStackTrace();
}

Kotlin

try {
    pdfViewCtrl?.setDrawAnnotations(false)
    pdfViewCtrl?.update(true)
} catch (e : PDFNetException) {
    e.printStackTrace()
}

After toggling annotation and form fields visibility in PDFViewCtrl, You must call update to redraw the pdf content.