android 开发将view保存为image的实现及将html保存为pdf格式

最新推荐文章于 2023-07-13 15:44:26 发布

转载最新推荐文章于 2023-07-13 15:44:26 发布 · 523 阅读

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原文链接：http://www.cnblogs.com/merlyn/p/9447792.html

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#移动开发

本文介绍如何在Android平台上将View转换为Image，并提供了一种将HTML代码保存为PDF文件的方法。具体包括：实现View到Bitmap的转换、保存Bitmap到本地及刷新相册；通过使用itextpdf、jsoup和xmlworker等库将HTML字符串转化为PDF。

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一、将view保存为image

public class ImageHelper {


　　///将view保存到bitmap中
    public Bitmap createBitmap(View view) {
        int widthSpec = View.MeasureSpec.makeMeasureSpec(view.getLayoutParams().width, View.MeasureSpec.EXACTLY);
        int heightSpec = View.MeasureSpec.makeMeasureSpec(view.getLayoutParams().height, View.MeasureSpec.EXACTLY);
        view.measure(widthSpec, heightSpec);
        int measureWidth = view.getMeasuredWidth();
        int measureHeight = view.getMeasuredHeight();
        view.layout(0, 0, measureWidth, measureHeight);
        int width = view.getWidth();
        int height = view.getHeight();
        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        view.draw(canvas);
        return bitmap;
    }
    /**
     * 保存bitmap到本地并拷贝并刷新相册
     *
     * @param context  上下文
     * @param mBitmap  图片信息
     * @param savePath  保存路径（临时）
     * @param fileName  文件名
     * @return
     */
    //public  String saveBitmap(Context context,Bitmap mBitmap,String savePath,String fileName) {
        public  String saveBitmap(Context context,Bitmap mBitmap,String savePath) {
        File filePic;
        try {
            filePic = new File(savePath);
            if (!filePic.exists()) {
                filePic.getParentFile().mkdirs();
                filePic.createNewFile();
            }
            FileOutputStream fos = new FileOutputStream(filePic);
            mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return "保存图片到本地时报错："+e.getMessage();
        }
        // 其次把文件插入到系统图库
//        try {
//            MediaStore.Images.Media.insertImage(context.getContentResolver(),
//                    filePic.getAbsolutePath(), fileName, null);
//            //MyToastUtils.showShortToast(context, "保存成功");
//        } catch (FileNotFoundException e) {
//            //MyToastUtils.showShortToast(context, "保存失败");
//            e.printStackTrace();
//            return "把文件插入到系统图库失败："+e.getMessage();
//        }
        // 最后通知图库更新
        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,
                Uri.fromFile(new File(filePic.getPath()))));

        return "Success";
    }
}

二、将html代码保存为pdf

需要引入三个jar包：itextpdf-5.5.jar、jsoup-1.7.jar、xmlworker-5.5.3.jar

public class PDFHelper {

    ///保存文件的方法
    public String createPDF(String rawHTML, String fileName, ContextWrapper context){

        File file = new File(fileName);

        try{
            Document document = new Document();
            PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));
            document.open();

            //  HTML
            String htmlText = Jsoup.clean( rawHTML, Whitelist.relaxed() );
            InputStream inputStream = new ByteArrayInputStream( htmlText.getBytes() );

            //  PDF
            XMLWorkerHelper.getInstance().parseXHtml(writer, document,
                    inputStream, null, Charset.defaultCharset(), new MyFont());

            document.close();
            return "";

        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return "Error|"+e.getMessage();
        } catch (DocumentException e) {
            e.printStackTrace();
            return "Error|"+e.getMessage();
        } catch (IOException e) {
            e.printStackTrace();
            return "Error|"+e.getMessage();
        }
    }

    public class MyFont implements FontProvider {
        private static final String FONT_PATH = "/system/fonts/DroidSansFallback.ttf";
        private static final String FONT_ALIAS = "my_font";

        public MyFont() {
            FontFactory.register(FONT_PATH, FONT_ALIAS);
        }

        @Override
        public Font getFont(String fontname, String encoding, boolean embedded,
                            float size, int style, BaseColor color) {

            return FontFactory.getFont(FONT_ALIAS, BaseFont.IDENTITY_H,
                    BaseFont.EMBEDDED, size, style, color);
        }

        @Override
        public boolean isRegistered(String name) {
            return name.equals(FONT_ALIAS);
        }
    }
}

转载于:https://www.cnblogs.com/merlyn/p/9447792.html