Android 从服务器获取图像到 SQLite 数据库

Question

Android 从服务器获取图像到 SQLite 数据库

我需要在新闻部分显示图像，并且在没有互联网连接时我想离线阅读它们。我是用标题和正文来做的，但是对于新闻图片来说太慢了，我该如何改进呢？

我试图获取字符串 url 并将其存储为字节数组：

         public byte[] downloadImage(String urlImg) throws Exception{

            URL url = new URL(urlImg);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            con.setRequestMethod("GET");
            con.setReadTimeout(10000);
            con.setConnectTimeout(10000);

            ByteArrayOutputStream bos = new ByteArrayOutputStream();

            try {
                Bitmap b = BitmapFactory.decodeStream(con.getInputStream());
                b.compress(Bitmap.CompressFormat.WEBP, 0, bos);
            } finally {
                con.disconnect();
            }

            return bos.toByteArray();
        }

然后我在 doInBackground 中这样称呼它：

@Override
        protected Boolean doInBackground(String... urls) {

            try {
                HttpGet httppost = new HttpGet("http://www.77-webdev.com/clients/thebeautyworkshop/news.json");
                HttpClient httpclient = new DefaultHttpClient();
                HttpResponse response = httpclient.execute(httppost);

                int status = response.getStatusLine().getStatusCode();
                if (status == 200){
                    DataSource.deleteAll();
                    HttpEntity entity = response.getEntity();
                    String data = EntityUtils.toString(entity);

                    JSONObject jsonObject = new JSONObject(data);
                    JSONArray jsonArray = jsonObject.getJSONArray("News");
                    News news = new News();
                    for (int i=0; i < jsonArray.length();i++){
                        JSONObject JObject = jsonArray.getJSONObject(i);

                        String Title =  JObject.getString("title");
                        String body =  JObject.getString("mobile_body");
                        String Image =  JObject.getString("image");
                        String lang =  JObject.getString("lang");
                        byte[]  IMG = downloadImage(Image);


                        news.setTitle(Title);
                        news.setMobile_body(body);
                        news.setImageB(IMG);
                        news.setLang(lang);
                        DataSource.create(news);
                        newsList.add(news);

                    }

                    return true;
                }


            } catch (ParseException e1) {
                e1.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
            return false;
        }

但这也是因为我正在为每张图片连接

Answer 1

如果您知道要将图像放入哪个视图中，可以使用Square's Picasso 来简化图像处理：

Picasso
        .with(context)
        .load(Image)
        .into(imageView);