* This class enables rendering a PDF document and selecting, searching, fast scrolling, * annotations, etc from Android R till Android U. This class is thread safe and can be called by * multiple threads however only one thread will be executed at a time as the access is * synchronized by internal locking. *
* If you want to render a PDF, you will need to create a new instance of renderer for each * document. To render each page, you open the page using the renderer instance created earlier, * render it, and close the page. After you are done with rendering, you close the renderer. After * the renderer is closed it should not be used anymore. Note that the pages are rendered one by * one, i.e. you can have only a single page opened at any given time. *
* A typical use of the APIs to render a PDF looks like this: *
* // create a new renderer
* try (PdfRendererPreV renderer = new PdfRendererPreV(getSeekableFileDescriptor(), loadParams)) {
* // let us just render all pages
* final int pageCount = renderer.getPageCount();
* for (int i = 0; i < pageCount; i++) {
* Page page = renderer.openPage(i);
* RenderParams params = new RenderParams.Builder(Page.RENDER_MODE_FOR_DISPLAY).build();
*
* // say we render for showing on the screen
* page.render(mBitmap, params, null, null);
*
* // do stuff with the bitmap
*
* // close the page
* page.close();
* }
* }
*
* * Please refer to {@link PdfRenderer} for fulfilling this usecase. */ @FlaggedApi(Flags.FLAG_ENABLE_PDF_VIEWER) public final class PdfRendererPreV implements AutoCloseable { /** Represents a non-linearized PDF document. */ public static final int DOCUMENT_LINEARIZED_TYPE_NON_LINEARIZED = 0; /** Represents a linearized PDF document. */ public static final int DOCUMENT_LINEARIZED_TYPE_LINEARIZED = 1; /** Represents a PDF without form fields */ @FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING) public static final int PDF_FORM_TYPE_NONE = 0; /** Represents a PDF with form fields specified using the AcroForm spec */ @FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING) public static final int PDF_FORM_TYPE_ACRO_FORM = 1; /** Represents a PDF with form fields specified using the entire XFA spec */ @FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING) public static final int PDF_FORM_TYPE_XFA_FULL = 2; /** Represents a PDF with form fields specified using the XFAF subset of the XFA spec */ @FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING) public static final int PDF_FORM_TYPE_XFA_FOREGROUND = 3; private final int mPageCount; private PdfProcessor mPdfProcessor; /** * Creates a new instance of PdfRendererPreV class. *
* Note: The provided file descriptor must be seekable, * i.e. its data being randomly accessed, e.g. pointing to a file. *
* Note: This class takes ownership of the passed in file descriptor * and is responsible for closing it when the renderer is closed. *
* If the file is from an untrusted source it is recommended to run the renderer in a separate, * isolated process with minimal permissions to limit the impact of security exploits. * * @param fileDescriptor Seekable file descriptor to read from. * @throws java.io.IOException If an error occurs while reading the file. * @throws java.lang.SecurityException If the file requires a password or * the security scheme is not supported by the renderer. * @throws IllegalArgumentException If the {@link ParcelFileDescriptor} is not seekable. * @throws NullPointerException If the file descriptor is null. */ public PdfRendererPreV(@NonNull ParcelFileDescriptor fileDescriptor) throws IOException { Preconditions.checkNotNull(fileDescriptor, "Input FD cannot be null"); try { mPdfProcessor = new PdfProcessor(); mPdfProcessor.create(fileDescriptor, null); mPageCount = mPdfProcessor.getNumPages(); } catch (Throwable t) { doClose(); throw t; } } /** * Creates a new instance of PdfRendererPreV class. *
* Note: The provided file descriptor must be seekable, * i.e. its data being randomly accessed, e.g. pointing to a file. If the password passed in * {@link android.graphics.pdf.LoadParams} is incorrect, the * {@link android.graphics.pdf.PdfRendererPreV} will throw a {@link SecurityException}. *
* Note: This class takes ownership of the passed in file descriptor * and is responsible for closing it when the renderer is closed. *
* If the file is from an untrusted source it is recommended to run the renderer in a separate, * isolated process with minimal permissions to limit the impact of security exploits. * * @param fileDescriptor Seekable file descriptor to read from. * @param params Instance of {@link LoadParams} specifying params for loading PDF * document. * @throws java.io.IOException If an error occurs while reading the file. * @throws java.lang.SecurityException If the file requires a password or * the security scheme is not supported by the renderer. * @throws IllegalArgumentException If the {@link ParcelFileDescriptor} is not seekable. * @throws NullPointerException If the file descriptor or load params is null. */ public PdfRendererPreV(@NonNull ParcelFileDescriptor fileDescriptor, @NonNull LoadParams params) throws IOException { Preconditions.checkNotNull(fileDescriptor, "Input FD cannot be null"); Preconditions.checkNotNull(params, "LoadParams cannot be null"); try { mPdfProcessor = new PdfProcessor(); mPdfProcessor.create(fileDescriptor, params); mPageCount = mPdfProcessor.getNumPages(); } catch (Throwable t) { doClose(); throw t; } } /** * Gets the number of pages in the document. * * @return The page count. * @throws IllegalStateException If {@link #close()} is called before invoking this. */ @IntRange(from = 0) public int getPageCount() { throwIfDocumentClosed(); return mPageCount; } /** * Gets the type of the PDF document. * * @return The PDF document type. * @throws IllegalStateException If {@link #close()} is called before invoking this. */ @PdfDocumentLinearizationType public int getDocumentLinearizationType() { throwIfDocumentClosed(); int documentType = mPdfProcessor.getDocumentLinearizationType(); if (documentType == PDF_DOCUMENT_TYPE_LINEARIZED) { return DOCUMENT_LINEARIZED_TYPE_LINEARIZED; } else { return DOCUMENT_LINEARIZED_TYPE_NON_LINEARIZED; } } /** * Opens a {@link Page} for rendering. * * @param index The page index to open, starting from index 0. * @return A page that can be rendered. * @throws IllegalStateException If {@link #close()} is called before invoking this. * @throws IllegalArgumentException If the page number is less than 0 or greater than or equal * to the total page count. */ @NonNull public Page openPage(@IntRange(from = 0) int index) { throwIfDocumentClosed(); throwIfPageNotInDocument(index); return new Page(index); } /** * Returns the form type of the loaded PDF * * @throws IllegalStateException if the renderer is closed * @throws IllegalArgumentException if an unexpected PDF form type is returned */ @PdfFormType @FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING) public int getPdfFormType() { throwIfDocumentClosed(); int pdfFormType = mPdfProcessor.getPdfFormType(); if (pdfFormType == PDF_FORM_TYPE_ACRO_FORM) { return PDF_FORM_TYPE_ACRO_FORM; } else if (pdfFormType == PDF_FORM_TYPE_XFA_FULL) { return PDF_FORM_TYPE_XFA_FULL; } else if (pdfFormType == PDF_FORM_TYPE_XFA_FOREGROUND) { return PDF_FORM_TYPE_XFA_FOREGROUND; } else { return PDF_FORM_TYPE_NONE; } } /** *
* Saves the current state of the loaded PDF document to the given writable * {@link ParcelFileDescriptor}. If the document is password-protected then setting * {@code removePasswordProtection} removes the protection before saving. The PDF document * should already be decrypted with the correct password before writing. Useful for printing or * sharing. * Note: This method closes the provided file descriptor. * * @param destination The writable {@link ParcelFileDescriptor} * @param removePasswordProtection If true, removes password protection from the PDF before * saving. * @throws IOException If there's a write error, or if 'removePasswordSecurity' is * {@code true} but the document remains encrypted. * @throws IllegalStateException If {@link #close()} is called before invoking this. */ public void write(@NonNull ParcelFileDescriptor destination, boolean removePasswordProtection) throws IOException { throwIfDocumentClosed(); mPdfProcessor.write(destination, removePasswordProtection); } /** * Closes this renderer and destroys any cached instance of the document. You should not use * this instance after this method is called. * * @throws IllegalStateException If {@link #close()} is called before invoking this. */ @Override public void close() { throwIfDocumentClosed(); doClose(); } // SuppressLint: Finalize needs to be overridden to make sure all resources are closed // gracefully @Override @SuppressLint("GenericException") protected void finalize() throws Throwable { try { doClose(); } finally { super.finalize(); } } private void doClose() { if (mPdfProcessor != null) { mPdfProcessor.ensurePdfDestroyed(); mPdfProcessor = null; } } private void throwIfDocumentClosed() { if (mPdfProcessor == null) { throw new IllegalStateException("Document already closed!"); } } private void throwIfPageNotInDocument(int pageIndex) { if (pageIndex < 0 || pageIndex >= mPageCount) { throw new IllegalArgumentException("Invalid page index"); } } /** @hide */ @IntDef({PDF_FORM_TYPE_NONE, PDF_FORM_TYPE_ACRO_FORM, PDF_FORM_TYPE_XFA_FULL, PDF_FORM_TYPE_XFA_FOREGROUND}) @Retention(RetentionPolicy.SOURCE) public @interface PdfFormType { } /** @hide */ @RestrictTo(RestrictTo.Scope.LIBRARY) @Retention(RetentionPolicy.SOURCE) @IntDef(prefix = {"PDF_DOCUMENT_TYPE_"}, value = {DOCUMENT_LINEARIZED_TYPE_NON_LINEARIZED, DOCUMENT_LINEARIZED_TYPE_LINEARIZED}) public @interface PdfDocumentLinearizationType { } /** * This class represents a PDF document page for rendering. */ public final class Page implements AutoCloseable { private final int mWidth; private final int mHeight; private int mIndex; private Page(int index) { this.mIndex = index; mWidth = mPdfProcessor.getPageWidth(index); mHeight = mPdfProcessor.getPageHeight(index); } /** * Gets the page index. * * @return The index. */ @IntRange(from = 0) public int getIndex() { return mIndex; } /** * Renders a page to a bitmap. In case of default zoom, the {@link Bitmap} dimensions will * be equal to the page dimensions. In this case, {@link Rect} parameter can be null. * *
In case of zoom, the {@link Rect} parameter needs to be specified which represents * the offset from top and left for tile generation purposes. In this case, the * {@link Bitmap} dimensions should be equal to the tile dimensions. *
* Note: The method will take care of closing the bitmap. Should be
* invoked
* on the {@link android.annotation.WorkerThread} as it is long-running task.
*
* @param destination Destination bitmap to write to.
* @param destClip If null, default zoom is applied. In case the value is non-null, the
* value specifies the top top-left corner of the tile.
* @param transform Applied to scale the bitmap up/down from default 1/72 points.
* @param params Render params for the changing display mode and/or annotations.
* @throws IllegalStateException If the document/page is closed before invocation.
*/
public void render(@NonNull Bitmap destination, @Nullable Rect destClip,
@Nullable Matrix transform, @NonNull RenderParams params) {
throwIfDocumentOrPageClosed();
mPdfProcessor.renderPage(mIndex, destination, destClip, transform, params);
}
/**
* Return list of {@link PdfPageTextContent} found on the page, ordered left to right
* and top to bottom. It contains all the content associated with text found on the page.
* The list will be empty if there are no results found. Currently, localisation does
* not have any impact on the order in which {@link PdfPageTextContent} is returned.
*
* @return list of text content found on the page.
* @throws IllegalStateException If the document/page is closed before invocation.
*/
@NonNull
public List
* Note: Should be invoked on the {@link android.annotation.WorkerThread}
* as it is long-running task.
*
* @param query plain search string for querying the document
* @return List of {@link PageMatchBounds} representing the bounds of each match on the
* page.
* @throws IllegalStateException If the document/page is closed before invocation.
*/
@NonNull
public List
* Note: Should be invoked on a {@link android.annotation.WorkerThread}
* as it is long-running task.
*
* @param start boundary where the selection starts (inclusive)
* @param stop boundary where the selection stops (exclusive)
* @return collection of the selected content for text, images, etc.
* @throws IllegalStateException If the document/page is closed before invocation.
*/
@Nullable
public PageSelection selectContent(@NonNull SelectionBoundary start,
@NonNull SelectionBoundary stop) {
throwIfDocumentOrPageClosed();
return mPdfProcessor.selectPageText(mIndex, start, stop);
}
/**
* Get the bounds and URLs of all the links on the given page.
*
* @return list of all links on the page.
* @throws IllegalStateException If the document/page is closed before invocation.
*/
@NonNull
public List Apps must call {@link #render(Bitmap, Rect, Matrix, RenderParams)} to render new
* bitmaps for the corresponding areas of the page.
*
* For click type {@link FormEditRecord}s, performs a click on {@link
* FormEditRecord#getClickPoint()}
*
* For set text type {@link FormEditRecord}s, sets the text value of the form widget.
*
* For set indices type {@link FormEditRecord}s, sets the {@link
* FormEditRecord#getSelectedIndices()} as selected and all others as unselected for the
* form widget indicated by the record.
*
* @param editRecord the {@link FormEditRecord} to be applied
* @return Rectangular areas of the page bitmap that have been invalidated by this action.
* @throws IllegalArgumentException if the provided {@link FormEditRecord} cannot be
* applied to the widget indicated by the index, or if the
* index does not correspond to a widget on the page.
* @throws IllegalStateException If the document is already closed.
* @throws IllegalStateException If the page is already closed.
*/
@android.annotation.NonNull
@FlaggedApi(Flags.FLAG_ENABLE_FORM_FILLING)
public List