How to Create PDF Annotations Using CPDFReaderView

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Note: Creating annotations in a PDF using the ComPDFKit PDF SDK for Android can be divided into 2 parts:

1. Creating annotations programmatically
2. Drawing annotations by swiping on the screen with a finger in conjunction with CPDFReaderView

Currently, the ComPDF Guides documentation only covers how to create annotations programmatically. However, many customers have expressed interest in the ability to draw annotations by swiping on the screen using CPDFReaderView. Today, we are providing a complete solution to address this need：

Solution

Based on the API usage guide we provide, you can implement the ability to add annotations by swiping on the screen with a finger in your Android application:

After displaying a PDF using CPDFReaderView following this guide, please follow the steps below to enable annotation via finger swipe:

Next, we'll take the example of adding a highlight annotation to text on a PDF page:

1. Switch to annotation mode, which allows you to add, edit, and delete annotations.

cpdfReaderView.setViewMode(ViewMode.ANNOT);	

2. Set the current touch mode toTouchMode.ADD_ANNOTto enable touch events for adding annotations.

cPdfReaderView.setTouchMode(CPDFReaderView.TouchMode.ADD_ANNOT);

3. Set the touch focus type to highlight annotation to enable adding highlight annotations via touch.

cPdfReaderView.setCurrentFocusedType(CPDFAnnotation.Type.HIGHLIGHT);

By following the steps above, you can swipe over text areas on the screen to add highlight annotations.

4. If you need to exit the highlight annotation mode and switch back to viewing mode, please refer to:

cPdfReaderView.setTouchMode(CPDFReaderView.TouchMode.BROWSE);
cPdfReaderView.setCurrentFocusedType(CPDFAnnotation.Type.UNKNOWN)