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copied!<p><strong>Primary issue :</strong></p> <pre><code>SetConstant.CONTENT_ID = contentId[i]; String URL = SetConstant.URL_DOWNLOAD_CONTENT+contentId[i]; </code></pre> <p>Here, you are facing trouble. As @Sofi Software LLC's answer, you are using a global variable, whose value is being changed by the main thread, in another thread.</p> <p><strong>Secondary Issue :</strong></p> <ul> <li>If you want a progress bar to update, you have to update its value;<br> it doesn't update itself.</li> </ul> <p>You do need to download the image in AsyncTask (Downloading from URL). Effectively to achieve your functionality, you need to do</p> <ul> <li>Create AsyncTask to download your image (implement download in doInBackground()), also have a boolean (say isImageDownloaded) to track if the image is successfully downloaded in postExecute().</li> <li>Don't forget to also show your progress bar before initiating the download</li> <li>Execute your AsyncTask to initiate download</li> <li>Create extension of android.os.CountDownTimer to countdown a minimum time</li> <li>On the method onFinish() check the boolean that you track, if it is false then you cancel the AsyncTask and throw the toast/dialog that you intended</li> <li>Running multipule instance of AsyncTask is not a good idea, so do one after another. You can execute your AsyncTask's on an Executor using executeOnExecutor().To make sure that the threads are running in a serial fashion please use: SERIAL_EXECUTOR.</li> </ul> <p><strong>Following resources may help you #</strong></p> <p>If you need to download an image, show progress bar and load in a imageview</p> <ul> <li><a href="https://github.com/koush/UrlImageViewHelper" rel="nofollow noreferrer">https://github.com/koush/UrlImageViewHelper</a></li> <li><a href="http://developer.aiwgame.com/imageview-show-image-from-url-on-android-4-0.html" rel="nofollow noreferrer">http://developer.aiwgame.com/imageview-show-image-from-url-on-android-4-0.html</a></li> <li><a href="http://blog.blundell-apps.com/imageview-with-loading-spinner/" rel="nofollow noreferrer">http://blog.blundell-apps.com/imageview-with-loading-spinner/</a></li> </ul> <p>If you need to download multiple files (here, for images) using AsyncTask</p> <ul> <li><a href="https://stackoverflow.com/questions/5079335/problem-with-downloading-multiple-files-using-asynctask">Problem with downloading multiple files using AsyncTask</a></li> <li><a href="https://stackoverflow.com/questions/5103727/how-to-get-back-the-task-completion-status-in-asynctask">How to get back the task completion status in AsyncTask</a></li> <li><a href="https://stackoverflow.com/questions/5041978/implement-progress-bar-for-file-download-in-android">Implement Progress Bar for File Download in Android</a></li> </ul> <p><strong>EDIT:</strong></p> <p>From <a href="http://developer.aiwgame.com/imageview-show-image-from-url-on-android-4-0.html" rel="nofollow noreferrer">http://developer.aiwgame.com/imageview-show-image-from-url-on-android-4-0.html</a></p> <pre><code>new DownloadImageTask((ImageView) findViewById(R.id.imageView1)) .execute("http://java.sogeti.nl/JavaBlog/wp-content/uploads/2009/04/android_icon_256.png"); } public void onClick(View v) { startActivity(new Intent(this, IndexActivity.class)); finish(); } private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> { ImageView bmImage; public DownloadImageTask(ImageView bmImage) { this.bmImage = bmImage; } protected Bitmap doInBackground(String... urls) { String urldisplay = urls[0]; Bitmap mIcon11 = null; try { InputStream in = new java.net.URL(urldisplay).openStream(); mIcon11 = BitmapFactory.decodeStream(in); } catch (Exception e) { Log.e("Error", e.getMessage()); e.printStackTrace(); } return mIcon11; } protected void onPostExecute(Bitmap result) { bmImage.setImageBitmap(result); } } </code></pre> <p>From <a href="https://stackoverflow.com/questions/7125490/image-download-in-an-android-imageview-and-progressbar-implementation">Image download in an Android ImageView and Progressbar implementation</a></p> <pre><code> // note that you could also use other timer related class in Android aside from this CountDownTimer, I prefer this class because I could do something on every interval basis // tick every 10 secs (or what you think is necessary) CountDownTimer timer = new CountDownTimer(30000, 10000) { @Override public void onFinish() { // check the boolean, if it is false, throw toast/dialog } @Override public void onTick(long millisUntilFinished) { // you could alternatively update anything you want every tick of the interval that you specified } }; timer.start() </code></pre>

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