How to add thumbnails

1)I need to know how to add the thumbnails.I know below is the thumbnail tag which to add xml file.Can you tell me how to get the reference to this tag from java code and set the thumbnail from given path in sdcard?


<com.radaee.util.PDFThumbView
android:id="@+id/thumbs"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_above="@+id/bar_find"
android:layout_alignParentBottom="true" />

2)can't we use the pdf file to get the thumbnail view?

in PDFReaderAct.onCreate(), there are codes:
m_layout = (RelativeLayout)LayoutInflater.from(this).inflate(R.layout.reader, null);
m_reader = (PDFReader)m_layout.findViewById(R.id.view);
m_thumb = (PDFThumbView)m_layout.findViewById(R.id.thumbs);
codes above, shows how to get thumb view object from layout.

when open a PDF file, invoke:
m_thumb.thumbOpen(m_reader.PDFGetDoc(), this);

and close PDF file, shall:
m_thumb.thumbClose();

I have viewpager with several fragments.I need to show thumbnails.But i am opening the pdf file in the fragment.So i am unable to get all thumbnails.It just so me the relevant page fragment.I need to see all thumnails?

do u mean that show many Documents in 1 thumb view?
there are 2 ways:
1. derive a Document class, which manged many Documents like 1 Document object.
2. Merge all Documens in 1 PDF file.