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public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    pdfLayoutView = new PDFLayoutView(Context);
    return pdfLayoutView;
}

public override void OnResume()
{
    base.OnResume();
    var path = "/data/user/0/com.myproject.android/files/1/Documents/TestDoc.pdf"
    showDocument(path);
}

public void showDocument(string path)
{
    Global.Init(Context);

    PDFFileStream fileStream = new PDFFileStream();
    bool is_open = fileStream.Open(path);
    int size = fileStream.Get_size();

    Document pdfDoc = new Document();
    int result_open = pdfDoc.OpenStream(fileStream, "");
    bool result_cache = pdfDoc.SetCache(Global.TmpPath + "/temp.dat");

    pdfLayoutView.PDFOpen(pdfDoc, this);
}