Facing issues with highlighting on Android

Project Description: In our application Html data is being rendered on webview of Android app. User can highlight the selected text. Selection could be a single word, across the paragraph or page. Service API are already exposed to save the highlighted data and below is the signature: Highlight(paragraphId, startIndex, startHTML, endIndex,endHTML) paragraphId: is the unique id of the paragraph where selection has been made. startIndex : is the position of the word from where selection started. startHTML : opening span tag. endIndex : is the length of the selection. endHTML : end of span tag. We need these parameters value through highlight logic so that we could save the data in a predefined manner. There is a limitation to do highlight and save the data in this way only as there are two other components(iOS app & web browser app) which are in sync with this Android app and usually these other components fetch the data in this format with the same set of service API. The candidate needs to be an expert at Android and Javascript because our senior Android developers have already tried this out and haven’t been able to do [login to view URL] revert back only if you have the relevant experience. We need it pretty fast in a day or two.