PDF Viewer API for android

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http://stackoverflow.com – Is there a Free PDF Viewer that I can use for my Application? I am looking for a PDF Viewer that can search, highlight text, view the page that user wants, and without altering the contents of the PDF file. Just like Adobe Reader but for Android that can be implemented to a Application. You can link me to a same question or source code. EDIT: I have found this question "Pdf viewer api/library for android app sample code?" but I think his looking for a Reader. this question "pdf viewer library for android" I read that to view pdf it should be Natively and the solution for that is to use Ext (HowTos)