PdfRendererBasicFragment.java 文件源码

/**
 * Show pages by index
 */
private void showPage(int index) {
    if (mPdfRenderer == null || mPdfRenderer.getPageCount() <= index) {
        System.out.println("pdf render is null");
        return;
    }
    // Make sure to close the current page before opening another one.
    if (null != mCurrentPage) {
        mCurrentPage.close();
    }
    // Use `openPage` to open a specific page in PDF.
    mCurrentPage = mPdfRenderer.openPage(index);
    // Important: the destination bitmap must be ARGB (not RGB).
    if (pdfBitmap != null) {
        mImageView.setImageBitmap(null);
        pdfBitmap.recycle();
    }
    pdfBitmap = Bitmap.createBitmap(mCurrentPage.getWidth(), mCurrentPage.getHeight(),
            Bitmap.Config.ARGB_8888);
    // Here, we render the page onto the Bitmap.
    // To render a portion of the page, use the second and third parameter. Pass nulls to get
    // the default result.
    // Pass either RENDER_MODE_FOR_DISPLAY or RENDER_MODE_FOR_PRINT for the last parameter.
    mCurrentPage.render(pdfBitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
    // We are ready to show the Bitmap to user.
    mImageView.setImageBitmap(pdfBitmap);
    updateUi();
}