TOPIC:

Dear Alok,
To highlight a text you need to:
1-Activate the select tool, by clicking on the select tool button.
2-Start selecting the text on the page. (with the touch event)
3-As sson as the touch event finishes (touch up event), a popup will appear where you can choose the desired action.
4-Click the Ok button to confirm the action.

Note, The license needs to be activated, and the file needs to opened in write mode.
Check the attached screenshot.

Dear Alok,

When the selection button is clicked, the selection is activated usingin PDFReaderPage, then the touch event is handled in PDFView via:and finally the listener OnPDFSelected in PDFReaderPage

So make sure that all these parts are present in your project.

Dear Alok,

By doing a debug, can you check that all the states are handled correctly?

Is the method PDFVSel.DrawSel being called during the draw operation?