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Xamarin.Android

Step 1: Integrate

Step 2: View a document

Step 3: Customize

Xamarin.iOS

Step 1: Integrate

Step 2: View a document

Step 3: Customize

Xamarin.Forms

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Basic operations

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Open a document

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Permissions (Android)

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File format support

Viewer

Overview

New Document Viewer

Viewer Hierarchy (Android)

Integrate

Configuration

Customize Document Viewer

Customize PDFViewCtrl

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Stream PDF

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UI customization

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UI components

Quick menu (Android)

Customize quick menu (Android)

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Android

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Add a custom view to a page

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Annotation

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Connect to server

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MS Office

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Open MS Office file

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Conversion

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Web/HTML to PDF

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Convert PDF to PDF/A

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Forms

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Generate

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Page manipulation

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Crop pages

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Reorder pages

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Page labels editor (Android)

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Edit page content

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Watermark editor (Android)

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Extraction

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Digital signature

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Sign a document

Signature tool (Android)

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Certify a document

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Use measurement tools

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Print a document

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Redact

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Security

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Portfolios

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Create a package

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Low-level PDF API

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Info dictionary

PDF format

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Filters and streams

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Rotate pages (Android)

You can change the rotational alignment of pages with a graphical UI or programmatically.

Rotate document pages in Android

This tutorial only applies to Xamarin.Android.

The RotateDialogFragment allows users to rotate pages of the opened document by 90, 180 and 270 degrees. It also displays a thumbnail of the current page at the selected rotation angle.

Show rotate page dialog

To show a rotate pages dialog in your activity, create a new instance of RotateDialogFragment by calling newInstance() and setting the PDFViewCtrl:

C#

1public void showRotateDialog()
2{
3    pdftron.PDF.Dialog.RotateDialogFragment.NewInstance()
4        .SetPdfViewCtrl(mPdfViewCtrl)
5        .Show(this.SupportFragmentManager, "rotate_pages_dialog");
6}

API to programmatically rotate pages in Android

To rotate a page in a PDF document.

C#

1PDFDoc doc = new PDFDoc(filename);
2
3// Rotate the first page 90 degrees clockwise.
4Page page = doc.GetPage(1);
5Page.Rotate originalRotation = page.GetRotation();
6Page.Rotate rotation;
7switch (originalRotation)
8{
9  case Page.Rotate.e_0:   rotation = Page.Rotate.e_90;  break;
10  case Page.Rotate.e_90:  rotation = Page.Rotate.e_180; break;
11  case Page.Rotate.e_180: rotation = Page.Rotate.e_270; break;
12  case Page.Rotate.e_270: rotation = Page.Rotate.e_0;   break;
13  default:                rotation = Page.Rotate.e_0;   break;
14}
15page.SetRotation(rotation);

About rotating pages

A page can be rotated clockwise, by 90 degrees, when displayed or printed. The Page.GetRotation() method returns the Page.Rotate enum specifying the current rotation. Similarly, Page.SetRotation() sets the current rotation.

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