如何在 Android 中呈现 PDF 文件 [英] How to render a PDF file in Android

问题描述

Android 在其库中不支持 PDF.有什么方法可以在 Android 应用程序中渲染 PDF 文件?

Android does not have PDF support in its libraries. Is there any way to render PDF files in the Android applications?

推荐答案

自从 API Level 21 (Lollipop) Android 提供了一个 PdfRenderer 类:

Since API Level 21 (Lollipop) Android provides a PdfRenderer class:

// create a new renderer
 PdfRenderer renderer = new PdfRenderer(getSeekableFileDescriptor());

 // let us just render all pages
 final int pageCount = renderer.getPageCount();
 for (int i = 0; i < pageCount; i++) {
     Page page = renderer.openPage(i);

     // say we render for showing on the screen
     page.render(mBitmap, null, null, Page.RENDER_MODE_FOR_DISPLAY);

     // do stuff with the bitmap

     // close the page
     page.close();
 }

 // close the renderer
 renderer.close();

有关详细信息，请参阅示例应用.

For more information see the sample app.

对于较旧的 API，我推荐 Android PdfViewer 库，它非常快速且易于使用，已获得许可Apache 许可证 2.0:

For older APIs I recommend Android PdfViewer library, it is very fast and easy to use, licensed under Apache License 2.0:

pdfView.fromAsset(String)
  .pages(0, 2, 1, 3, 3, 3) // all pages are displayed by default
  .enableSwipe(true)
  .swipeHorizontal(false)
  .enableDoubletap(true)
  .defaultPage(0)
  .onDraw(onDrawListener)
  .onLoad(onLoadCompleteListener)
  .onPageChange(onPageChangeListener)
  .onPageScroll(onPageScrollListener)
  .onError(onErrorListener)
  .enableAnnotationRendering(false)
  .password(null)
  .scrollHandle(null)
  .load();

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