How Can I Render PDF Files in My Android Application?

Rendering PDF Files in Android Applications

Android lacks built-in PDF support. However, introducing a PDF viewer library or utilizing Android's PdfRenderer class (available since API Level 21) unlocks the ability to render PDF files within Android apps.

Using PdfRenderer

For API Level 21 and above, Android's PdfRenderer class offers a straightforward approach to render PDFs. Here's an example:

// Instantiate a PDF renderer.
PdfRenderer renderer = new PdfRenderer(getSeekableFileDescriptor());

// Iterate through all PDF pages.
final int pageCount = renderer.getPageCount();
for (int i = 0; i < pageCount; i++) {
    // Open the current page.
    Page page = renderer.openPage(i);

    // Render the page to a bitmap.
    page.render(mBitmap, null, null, Page.RENDER_MODE_FOR_DISPLAY);

    // Process the rendered bitmap.

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

// Close the renderer.
renderer.close();

Utilizing Android PdfViewer Library

For older API levels, the Android PdfViewer library provides a convenient solution. It features:

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();

By leveraging these techniques, developers can seamlessly render and display PDF files within their Android applications, regardless of the API level.

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