将pdf文件转换成图片并显示在界面，先要引用AndroidPDFViewerLibrary-masterByteBufferbuffer=ByteBuffer.NEW(bytes);Stringdata=Base64.encodeToString(bytes,Base64.DEFAULT);PDFFilepdf_file=newPDFFile(buffer);intnumPages=pdf_file.getNumPages();Log.v("tag","n