创建图片工具类

public class ImageUtil {

    // 调整HTML图片
    public static String adjustHTMLImage(String htmlText){
        if (htmlText == null){
            return null;
        }
        Document doc = Jsoup.parse(htmlText);
        Elements eLements = doc.getElementsByTag("img");
        for (Element element: eLements){
            // Override the width and height attribute
            element.attr("style", "display:block;width:100%;height:auto");
            // max-height:700px
        }
        return doc.toString();
    }


    // 压缩图片
    public static String compressImage(String filePath, String targetPath, int quality){
        Bitmap bm = getScaledBitmap(filePath);
        File output = new File(targetPath);
        try {
            if (!output.exists()){
                output.getParentFile().mkdir();
            } else {
                output.delete();
            }

            FileOutputStream out = new FileOutputStream(output);
            bm.compress(Bitmap.CompressFormat.JPEG, quality, out);
            out.close();
        } catch (Exception e){
            e.printStackTrace();
        }
        return output.getPath();
    }

    // 获得压缩图片
    private static Bitmap getScaledBitmap(String filePath){
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filePath, options);
        options.inSampleSize = calculateInSampleSize(options);
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeFile(filePath, options);
    }

    // 计算压缩尺寸
    private static int calculateInSampleSize(BitmapFactory.Options options){
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;
        if (height > 400 || width > 240){
            final int heightRatio = Math.round(height/ 400);
            final int widthRatio = Math.round(width/ 240);
            inSampleSize = heightRatio < width ? heightRatio : widthRatio;
        }
        return inSampleSize;
    }
}

webView中引用

mWebView = WebView(this)
mWebView!!.loadDataWithBaseURL(null, ImageUtil.adjustHTMLImage(mArticle.content), "text/html", "charset=UTF-8", null)

上传图片压缩

File(ImageUtil.compressImage(qrCodePath, compressedImagePath, 20))