Question

我在项目中遇到了这个问题，我需要将图像作为文件传递图像来自URL（示例：图像URL this url需要转换为文件而不下载图像），意味着图像URL需要转换文件然后传递给服务器。分析但我没有得到任何答案，

{
            "templateName": "e. Before-After(1).png",
            "templateId": "",
            "templateUrl": "https://cnet4.cbsistatic.com/img/QJcTT2ab-sYWwOGrxJc0MXSt3UI=/2011/10/27/a66dfbb7-fdc7-11e2-8c7c-d4ae52e62bcc/android-wallpaper5_2560x1600_1.jpg"
        }

从此回复＆＃34; templateUrl＆＃34;需要转换文件

Answer 1

    public class ImageDownloaderTask extends AsyncTask<String, Void, Bitmap>{ 
@Override
        protected Bitmap doInBackground(String... URL) {

            String imageURL = URL[0];

            Bitmap bitmap = null;
            try {
                // Download Image from URL
                InputStream input = new java.net.URL(imageURL).openStream();
                // Decode Bitmap
                bitmap = BitmapFactory.decodeStream(input);

            } catch (Exception e) {
                e.printStackTrace();
            }
            return bitmap;
        }

        @Override
        protected void onPostExecute(Bitmap result) {

            File file = CommonUtils.getDownloadFile(placeHolder);

            if (file == null)
                return;

            try {
                FileOutputStream out = new FileOutputStream(file);
                result.compress(Bitmap.CompressFormat.JPEG, 90, out);
                out.flush();
                out.close();

               // here you can get file in "file" variable.
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
    // Function for create a file where file download.
     public static File getDownloadFile(String placeHolder) {
            String root = Environment.getExternalStorageDirectory().toString();
            File myDir = new File(root + "/proManager");

            if (!myDir.exists()) {
                if (!myDir.mkdirs()) {
                    return null;
                }
            }

            String fname = FILE_NAME_PRE_TEXT + placeHolder + ".jpg";
            File file = new File(myDir, fname);

            if (file.exists()) file.delete();

            return file;
        }

如何使用此课程

ImageDownloaderTask imageDownloaderTask = new ImageDownloaderTask();
  imageDownloaderTask.execute(url);

如何在Android中将图像URL转换为文件

1 个答案: