Android 6.0带来了好多功能，PDF的读取展示就是其中一项
一.PDF文档的生成
DisplayMetrics displayMetrics = getResources().getDisplayMetrics(); // create a new document PdfDocument document = new PdfDocument();//当然，我们也可以使用PrintedPdfDocument,后者继承自前者 // crate a page descriptionfor(int i=0;i
二.PDF文档读取与显示(配合ViewPager使用)
ParcelFileDescriptor pfdesc = ParcelFileDescriptor.open(new File('/storage/cache/mypage.pdf',ParcelFileDescriptor.MODE_READ_ONLY));PdfRender pdfRender = new PdfRender(pfdesc);List mlist = new ArrayList (); //此处职位示例，正式项目请使用懒加载，否则可能导致OOMif(pdfRender.getPageCount()>0){ for(int i=0;i 三.打印PDF文档
打印pdf先要生成pdf打印文档，其次需要使用打印管理器
PrintManager printManager = (PrintManager) context.getSystemService(Context.PRINT_SERVICE); printManager.print(String printJobName, PrintDocumentAdapter documentAdapter, PrintAttributes attributes)
当然，我们需要完成PrintDocumentAdapter
public class MyPrintDocumentAdapter extends PrintDocumentAdapter{ Context context; private int pageHeight; private int pageWidth; public PdfDocument myPdfDocument; public int totalpages = 4; public MyPrintDocumentAdapter(Context context) { this.context = context; } @Override public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle metadata) { myPdfDocument = new PrintedPdfDocument(context, newAttributes); //创建可打印PDF文档对象 pageHeight = newAttributes.getMediaSize().getHeightMils()/1000 * 72; //设置尺寸 pageWidth = newAttributes.getMediaSize().getWidthMils()/1000 * 72; if (cancellationSignal.isCanceled() ) { callback.onLayoutCancelled(); return; } if (totalpages > 0) { PrintDocumentInfo.Builder builder = new PrintDocumentInfo .Builder("print_output.pdf") .setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT) .setPageCount(totalpages); //构建文档配置信息 PrintDocumentInfo info = builder.build(); callback.onLayoutFinished(info, true); } else { callback.onLayoutFailed("Page count is zero."); } } @Override public void onWrite(final PageRange[] pageRanges,final ParcelFileDescriptor destination,final CancellationSignal cancellationSignal, final WriteResultCallback callback) { for (int i = 0; i < totalpages; i++) { if (pageInRange(pageRanges, i)) //保证页码正确 { PageInfo newPage = new PageInfo.Builder(pageWidth, pageHeight, i).create(); PdfDocument.Page page = myPdfDocument.startPage(newPage); //创建新页面 if (cancellationSignal.isCanceled()) { //取消信号 callback.onWriteCancelled(); myPdfDocument.close(); myPdfDocument = null; return; } drawPage(page, i); //将内容绘制到页面Canvas上 myPdfDocument.finishPage(page); } } try { myPdfDocument.writeTo(new FileOutputStream( destination.getFileDescriptor())); } catch (IOException e) { callback.onWriteFailed(e.toString()); return; } finally { myPdfDocument.close(); myPdfDocument = null; } callback.onWriteFinished(pageRanges); } private boolean pageInRange(PageRange[] pageRanges, int page) { for (int i = 0; i = pageRanges[i].getStart()) && (page <= pageRanges[i].getEnd())) return true; } return false; } //页面绘制（渲染） private void drawPage(PdfDocument.Page page, int pagenumber) { Canvas canvas = page.getCanvas(); //这里是页码。页码不能从0开始 pagenumber++; int titleBaseLine = 72; int leftMargin = 54; Paint paint = new Paint(); paint.setColor(Color.BLACK); paint.setTextSize(40); canvas.drawText( "Test Print Document Page " + pagenumber, leftMargin, titleBaseLine, paint); paint.setTextSize(14); canvas.drawText("Android PDF 文档打印", leftMargin, titleBaseLine + 35, paint); if (pagenumber % 2 == 0) paint.setColor(Color.RED); else paint.setColor(Color.GREEN); PageInfo pageInfo = page.getInfo(); canvas.drawCircle(pageInfo.getPageWidth()/2, pageInfo.getPageHeight()/2, 150, paint); }}.