TOPIC:

    public static boolean mergeDocuments(Document doc1, Document doc2) {
        Document.ImportContext importContext = doc1.ImportStart(doc2);
        if (importContext != null) {
            doc1.ImportPage(importContext, 1, 2);
            importContext.Destroy();
            return true;
        }
        return false;
    }

	public ImportContext ImportStart( Document src )
	{
		if( src == null ) return null;
		int hand = importStart( hand_val, src.hand_val );
		if( hand != 0 ) return new ImportContext(this, hand);
		else return null;
	}

    public static boolean mergeDocuments(Document doc1, Document doc2)
    {
        Document.ImportContext importContext = doc1.ImportStart(doc2);
        int pageno = doc1.GetPageCount();
        int cnt = doc2.GetPageCount();
        if (importContext != null) {
            for( int cur = 0; cur < cnt; cur++ )
            {
                doc1.ImportPage(importContext, cur, pageno);
                pageno++;
            }
            importContext.Destroy();
            doc1.Save();
            return true;
        }
        return false;
    }

    private PDFReader initReader(String path1, String path2) {
        mReader = new PDFReader(parent, null);
        mDoc1 = new Document();
        int ret1 = mDoc1.Open(path1, null);
        if (!TextUtils.isEmpty(path2)) {
            mDoc2 = new Document();
            mDoc2.Open(path2, null);
            PDFHelper.mergeDocuments(mDoc1, mDoc2);
        }
        //
        if (ret1 == 0) {
            mReader.PDFOpen(mDoc1, false, null);
            return mReader;
        }
        return null;
    }
}