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PODownload images with AsyncTask
 

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    <p>I'm not really sure what goes wrong with my code or structure. I wanted to use AsyncTask to download images and display out the progress bar at the mean time. But I tried out a few different way of doing it. It still failed and no idea what's wrong with it. My structure flow is</p> <p><strong>ContentID is a string array that stores the content ID of the Images.</strong></p> <p><strong>Primary Issue: It managed to download images from the url and store into the phone, but the downloaded images are all the same image. It should be different images, it's not what I expected.</strong></p> <p><em>Secondary Issue: The progress bar pop up while the application downloading images, but the progress bar did not update it's progress. It just remains 0% and dismissed after the download completed.</em></p> <p>I wanted to know what causes primary and secodary issue as i mentioned. Please leave a comment or answer if you might know what's wrong with my code. Any help will be appreciated. </p> <pre><code>if(isSyncSuccess){ SetConstant.IMAGE_EXIST = 1; pDialog = new ProgressDialog(GalleryScreen.this); pDialog.setMessage("Downloading file. Please wait..."); pDialog.setIndeterminate(false); pDialog.setProgress(0); pDialog.setMax(contentId.length); pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); pDialog.setCancelable(true); if (contentId.length&gt;0){ Log.i(TAG, "contentid.length:" +contentId.length); for (int i=0;i&lt;contentId.length;i++){ if(helper.databaseChecking(useremail, contentId[i])){ contentdownload = i; SetConstant.CONTENT_ID = contentId[i]; String URL = SetConstant.URL_DOWNLOAD_CONTENT+contentId[i]; DownloadFile downloadFile = new DownloadFile(); downloadFile.execute(URL); } private class DownloadFile extends AsyncTask&lt;String, Integer, String&gt;{ @Override protected String doInBackground(String... sUrl){ Bitmap bm; InputStream in; try{ in = new java.net.URL(sUrl[0]).openStream(); bm = BitmapFactory.decodeStream(new PatchInputStream(in)); File storage = new File(Environment.getExternalStorageDirectory() + File.separator + "/Image/"); Log.i(TAG,"storage:" +storage); Log.i(TAG,"storage:" +storage.getAbsolutePath()); if(!storage.exists()){ storage.mkdirs(); } String FileName = "/"+SetConstant.CONTENT_ID+".jpg"; FileOutputStream fos = new FileOutputStream(storage + FileName); bm.compress(Bitmap.CompressFormat.JPEG, 85, fos); String filepath = storage + FileName; File filecheck = new File (filepath); long fileSize = filecheck.length(); fos.flush(); fos.close(); Log.i(TAG, "bm:" +bm); Log.i(TAG, "fos:" +fos); Log.i(TAG, "filesize:" +fileSize); Log.i(TAG, "filepath:" +filepath); } catch(IOException e1){ e1.printStackTrace(); } return null; } @Override protected void onPreExecute(){ super.onPreExecute(); pDialog.show(); } @Override protected void onProgressUpdate(Integer... progress){ super.onProgressUpdate(progress); pDialog.setProgress(progress[0]); } protected void onPostExecute(String result){ super.onPostExecute(result); pDialog.dismiss(); } } </code></pre> <p><strong>Edit</strong></p> <p>Now the application able to download images according and the progress bar is working as well! But I got another issue is how to return error message when the application failed to complete the download. Currently when the application failed to download it will crash. I believed that I should not run it inside the doInBackground side. But where else can I do the checking? Any idea how to return as an error message and request for the user to retry instead of crashing the application? </p>
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