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Watermark
Add watermarks to PDF in Android
The WatermarkDialog allows you to stamp a PDF document with text that overlays each page of the document.
Show the watermark editor
The watermark editor can be shown from an activity by calling the following method:
public void showWatermarkDialog(PDFViewCtrl pdfViewCtrl, FragmentManager fragmentManager) {
WatermarkDialog fragment = WatermarkDialog.newInstance(pdfViewCtrl);
fragment.show(fragmentManager);
}Get the answers you need: Support
PDFTron SDK
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