android在webview loaddatawithbaseurl中从我的班级加载图像答案

【问题标题】：android load image from my class in webview loaddatawithbaseurlandroid在webview loaddatawithbaseurl中从我的班级加载图像
【发布时间】：2019-11-12 15:56:04
【问题描述】：

我想在 webview 中使用我的课程下载 HTML 格式的图像。怎么做？我在 baseurl 中的网页加载。我的班级从互联网下载图像。请举例说明谢谢

【问题讨论】：

标签： android web view

【解决方案1】：

使用这个：webviewId.loadDataWithBaseURL("", response, "text/html", "UTF-8", "");

或

Html.ImageGetter() use this, this will search <img> tag

http://developer.android.com/reference/android/text/Html.ImageGetter.html

示例链接：

Html.ImageGetter

Android HTML ImageGetter as AsyncTask

【讨论】：

我想用我的班级下载 HTML 格式的图片？你的答案不适合它。
你是什么意思“与我的班级一起下载 HTML 图像”？你能解释一下吗？
如果图像存在于 HTML 中，则按 won 类下载图像？
如果我没记错的话，你想下载带有 HTML 标签的图像并想在 Webview 中显示，这意味着你也想在离线模式下显示。所以你不能这样做，但你可以简单地将完整的 HTML 响应存储在数据库中并在 Webview 中显示，所以有时图像会可见，这意味着被缓存但一段时间后它就不会可见了。所以一旦用户再次上网，同样的事情就会发生。
我要下载处理程序图像？

【解决方案2】：

    public class ImageGetter  implements Html.ImageGetter {
        Context c;
        View container;

        public ImageGetter(View t, Context c) {
            this.c = c;
            this.container = t;
        }

        public Drawable getDrawable(String source) {
            URLDrawable urlDrawable = new URLDrawable();

            // get the actual source
            ImageGetterAsyncTask asyncTask =
                new ImageGetterAsyncTask( urlDrawable);

        asyncTask.execute(source);

        // return reference to URLDrawable where I will change with actual image from
        // the src tag
        return urlDrawable;
    }

    public class ImageGetterAsyncTask extends AsyncTask<String, Void, Drawable> {
        URLDrawable urlDrawable;

        public ImageGetterAsyncTask(URLDrawable d) {
            this.urlDrawable = d;
        }

        @Override
        protected Drawable doInBackground(String... params) {
            String source = params[0];
            return fetchDrawable(source);
        }

        @Override
        protected void onPostExecute(Drawable result) {
            // set the correct bound according to the result from HTTP call

            urlDrawable.setBounds(0, 0, 0 + result.getIntrinsicWidth(), 0
                    + result.getIntrinsicHeight());


            // change the reference of the current drawable to the result
            // from the HTTP call
            urlDrawable.drawable = result;

            // redraw the image by invalidating the container
            ImageGetter.this.container.invalidate();
        }


        public Drawable fetchDrawable(String urlString) {
            try {
                //Get image from online and save it to the storage.
                InputStream is = fetch(urlString);
                Drawable drawable = Drawable.createFromStream(is, "src");
                drawable.setBounds(0, 0, 0 + drawable.getIntrinsicWidth(), 0
                        + drawable.getIntrinsicHeight());

                Bitmap bm = BitmapFactory.decodeStream( is);
                String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
                File file = new File(extStorageDirectory, urlString+".PNG");
                FileOutputStream outStream = new FileOutputStream(file);
                bm.compress(Bitmap.CompressFormat.PNG, 100, outStream);
                outStream.flush();
                outStream.close();
                return drawable;
            } catch (Exception e) {
                // offline use the stored image
                String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
                Bitmap bitmap = BitmapFactory.decodeFile(extStorageDirectory+urlString+".PNG");
                Drawable drawable = new BitmapDrawable(bitmap);
                drawable.setBounds(0, 0, 0 + drawable.getIntrinsicWidth(), 0
                        + drawable.getIntrinsicHeight());

                return drawable;
            }
        }

        private InputStream fetch(String urlString) throws IOException {
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpGet request = new HttpGet(urlString);
            HttpResponse response = httpClient.execute(request);
            return response.getEntity().getContent();
        }
    }
}

【讨论】：