Android--PDF預覽與創建

預覽

方式一：https://github.com/JoanZapata/android-pdfview
方式二：https://github.com/deepankar1994/MuPDF_For_Android (mupdf)

創建

public abstract class PdfCreator {
    private PdfDocument mDocument;
    private int mPageWidth = 600;
    private int mPageHeight = 400;

    /**
     *
     * @param pageWidth The page width in PostScript (1/72th of an inch).
     * @param pageHeight The page height in PostScript (1/72th of an inch).
     */
    public PdfCreator(int pageWidth, int pageHeight) {
        mDocument = new PdfDocument();
        this.mPageWidth = mPageWidth;
        this.mPageHeight = mPageHeight;
    }

    public PdfCreator() {
        mDocument = new PdfDocument();
    }

    /**
     * 保存pdf
     * @param path
     * @throws IOException
     */
    public void saveToFile(String path) throws IOException {
        mDocument.writeTo(new FileOutputStream(new File(path)));
    }

    public void createPage(int pageNumber) {
        PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(mPageWidth, mPageHeight, pageNumber).create();
        PdfDocument.Page page = mDocument.startPage(pageInfo);
        Canvas canvas = page.getCanvas();
        onDrawPage(canvas, pageInfo.getPageNumber());
        mDocument.finishPage(page);
    }

    public void endCreate() {
        mDocument.close();
    }

    public abstract void onDrawPage(Canvas canvas, int pageNum);

    public int getPageWidth() {
        return mPageWidth;
    }

    public void setPageWidth(int mPageWidth) {
        this.mPageWidth = mPageWidth;
    }

    public int getPageHeight() {
        return mPageHeight;
    }

    public void setPageHeight(int mPageHeight) {
        this.mPageHeight = mPageHeight;
    }
}

PDF轉圖片

PdfRenderer renderer = openRenderer(path);
int pageCount = renderer.getPageCount();
for(int i = 0; i < pageCount; i++) {
	PdfRenderer.Page page = renderer.openPage(i);
    Bitmap bitmap = Bitmap.createBitmap(page.getWidth(), page.getHeight(),
                    Bitmap.Config.ARGB_8888);
    page.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
}