如何使用Android打印PDF 4.4打印框架

如何使用Android 4.4打印框架打印已下载的​​PDF?

我查看了开发者文档。 但没有运气。 任何例子都会有所帮助

Solutions Collecting From Web of "如何使用Android打印PDF 4.4打印框架"

在谷歌上花了几个小时后,我find了解决scheme。

PrintManager printManager = (PrintManager) this.getSystemService(Context.PRINT_SERVICE); String jobName = this.getString(R.string.app_name) + " Document"; printManager.print(jobName, pda, null); PrintDocumentAdapter pda = new PrintDocumentAdapter(){ @Override public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback){ InputStream input = null; OutputStream output = null; try { input = new FileInputStream(file to print); output = new FileOutputStream(destination.getFileDescriptor()); byte[] buf = new byte[1024]; int bytesRead; while ((bytesRead = input.read(buf)) > 0) { output.write(buf, 0, bytesRead); } callback.onWriteFinished(new PageRange[]{PageRange.ALL_PAGES}); } catch (FileNotFoundException ee){ //Catch exception } catch (Exception e) { //Catch exception } finally { try { input.close(); output.close(); } catch (IOException e) { e.printStackTrace(); } } } @Override public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras){ if (cancellationSignal.isCanceled()) { callback.onLayoutCancelled(); return; } PrintDocumentInfo pdi = new PrintDocumentInfo.Builder("Name of file").setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).build(); callback.onLayoutFinished(pdi, true); } };