On the android platform PDF reader can be used as a reference to learn

Android PDF reader
..................\1-120QR135120-L.png
..................\Android PDF 阅读器源码
..................\......................\.classpath
..................\......................\.project
..................\......................\activitysrc
..................\......................\...........\net
..................\......................\...........\...\sf
..................\......................\...........\...\..\andpdf
..................\......................\...........\...\..\......\pdfviewer
..................\......................\...........\...\..\......\.........\ByteBuffer.java
..................\......................\...........\...\..\......\.........\MyAdapter.java
..................\......................\...........\...\..\......\.........\PdfFileSelectActivity.java
..................\......................\...........\...\..\......\.........\PdfViewerActivity.java
..................\......................\...........\...\..\......\.........\SimplePersistence.java
..................\......................\AndroidManifest.xml
..................\......................\assets
..................\......................\bin
..................\......................\...\AndroidPdfViewer.apk
..................\......................\...\androswing
..................\......................\...\..........\tree
..................\......................\...\..........\....\DefaultMutableTreeNode.class
..................\......................\...\classes.dex
..................\......................\...\com
..................\......................\...\...\sun
..................\......................\...\...\...\pdfview
..................\......................\...\...\...\.......\.cvsignore
..................\......................\...\...\...\.......\action
..................\......................\...\...\...\.......\......\GoToAction.class
..................\......................\...\...\...\.......\......\PDFAction.class
..................\......................\...\...\...\.......\BaseWatchable$Gate.class
..................\......................\...\...\...\.......\BaseWatchable.class
..................\......................\...\...\...\.......\Cache$PageRecord.class
..................\......................\...\...\...\.......\Cache$Record.class
..................\......................\...\...\...\.......\Cache.class
..................\......................\...\...\...\.......\colorspace
..................\......................\...\...\...\.......\..........\GrayColorSpace.class
..................\......................\...\...\...\.......\..........\IndexedColor.class
..................\......................\...\...\...\.......\..........\PDFColorSpace.class
..................\......................\...\...\...\.......\..........\RGBColorSpace.class
..................\......................\...\...\...\.......\decode
..................\......................\...\...\...\.......\......\ASCII85Decode.class
..................\......................\...\...\...\.......\......\ASCIIHexDecode.class
..................\......................\...\...\...\.......\......\CCITTCodes
..................\......................\...\...\...\.......\......\CCITTFaxDecode.class
..................\......................\...\...\...\.......\......\CCITTFaxDecoder.class
..................\......................\...\...\...\.......\......\DCTDecode.class
..................\......................\...\...\...\.......\......\FlateDecode.class
..................\......................\...\...\...\.......\......\LZWDecode.class
..................\......................\...\...\...\.......\......\PDFDecoder.class
..................\......................\...\...\...\.......\......\PNGPredictor.class
..................\......................\...\...\...\.......\......\Predictor.class
..................\......................\...\...\...\.......\......\RunLengthDecode.class
..................\......................\...\...\...\.......\decrypt
..................\......................\...\...\...\.......\..

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