Get great tech advice delivered to your inbox.Keep your family productive, connected, entertained, and safe.Please enter a valid email. Join Stack Overflow to learn, share knowledge, and build your career. Try again later.Thanks for signing up! 2018 Leaf Group Ltd. Finances & Taxes. Money & Debt. params) { FileOutputStream fos = null; try { fos = new FileOutputStream(imageFile); image.compress(format, 100, fos); } catch (IOException e) { error = new ImageError(e).setErrorCode(ImageError.ERRORGENERALEXCEPTION); this.cancel(true); } finally { if (fos != null) { try { fos.flush(); fos.close(); } catch (IOException e) { e.printStackTrace(); } } } return null; } Override protected void onCancelled() { listener.onBitmapSaveError(error); } Override protected void onPostExecute(Void result) { listener.onBitmapSaved(); } }.executeOnExecutor(AsyncTask.THREADPOOLEXECUTOR); } public static Bitmap readFromDisk(NonNull File imageFile) { if (!imageFile.exists() imageFile.isDirectory()) return null; return BitmapFactory.decodeFile(imageFile.getAbsolutePath()); } public interface OnImageReadListener { void onImageRead(Bitmap bitmap); void onReadFailed(); } public static void readFromDiskAsync(NonNull File imageFile, NonNull final OnImageReadListener listener) { new AsyncTask () { Override protected Bitmap doInBackground(String. Since this post has received quite a lot of attention, I have decided to completely rework it to prevent the folks from using deprecated technologies, bad programming practices or just doing silly things - like looking for "hacks" to run network on the main thread or accept all SSL certs. Business & Workplace Regulations. Just displaying an image using Picasso is as simple as: Picasso.with(myContext) .load(url) .into(myImageView); By default, Picasso manages the disk/memory cache so you don't need to worry about that. Running a Business. You can go to the HOMEPAGE OUR LATEST POSTS Skagens first Android Wear smartwatch stays true to the companys minimalist. Using the DownloadManager is generally not a good idea if you also want to display the image, since you'd need to read and decode the saved file instead of just setting the downloaded Bitmap into an ImageView. Business Technology & Customer Support. Business Communications & Etiquette. All it does is connecting to the given url, reading the data and trying to decode it as a Bitmap, triggering the OnImageLoaderListener interface callbacks when appropriate. public void saveImage(Context context, Bitmap b, String imageName) { FileOutputStream foStream; try { foStream = context.openFileOutput(imageName, Context.MODEPRIVATE); b.compress(Bitmap.CompressFormat.PNG, 100, foStream); foStream.close(); } catch (Exception e) { Log.d("saveImage", "Exception 2, Something went wrong!"); e.printStackTrace(); } } 2. First of all, this is a BasicImageDownloader and that's it. Human Resources. Note: I have not adjusted the permission management for SDK 23+ (Marshmallow) yet, thus the project is targeting SDK 22 (Lollipop). January 2, 2018 Tips & Tricks How to disable auto-download media on WhatsApp January 6, 2018 How to permanently delete your Instagram account January 3, 2018 How to check for updates on your Android device December 29, 2017 ABOUT USNow in our tenth year, AndroidGuys loves to provide readers with the latest news and rumors as well as reviews, opinion pieces, and tools to get more from your Android.Contact us: [emailprotected]FOLLOW US . private class DownloadImage extends AsyncTask { private String TAG = "DownloadImage"; private Bitmap downloadImageBitmap(String sUrl) { Bitmap bitmap = null; try { InputStream inputStream = new URL(sUrl).openStream(); // Download Image from URL bitmap = BitmapFactory.decodeStream(inputStream); // Decode Bitmap inputStream.close(); } catch (Exception e) { Log.d(TAG, "Exception 1, Something went wrong!"); e.printStackTrace(); } return bitmap; } Override protected Bitmap doInBackground(String. Conclusion - "I have learned about the great stuff, what should I use now?" Note that the following text reflects my personal opinion and should not be taken as a postulate. Error 404 Sorry, but the page you are looking for doesn't exist. Human Resources. Advertising & Marketing. objects) { try { URL url = new URL(requestUrl); URLConnection conn = url.openConnection(); bitmap = BitmapFactory.decodeStream(conn.getInputStream()); } catch (Exception ex) { } return null; } Override protected void onPostExecute(Object o) { if(!ImageStorage.checkifImageExists(imagename)) { view.setImageBitmap(bitmap); ImageStorage.saveToSdCard(bitmap, imagename); } } } Then create a class for saving and retrieving the files public class ImageStorage { public static String saveToSdCard(Bitmap bitmap, String filename) { String stored = null; File sdcard = Environment.getExternalStorageDirectory() ; File folder = new File(sdcard.getAbsoluteFile(), ".yourspecificdirectory");//the dot makes this directory hidden to the user folder.mkdir(); File file = new File(folder.getAbsoluteFile(), filename + ".jpg") ; if (file.exists()) return stored ; try { FileOutputStream out = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out); out.flush(); out.close(); stored = "success"; } catch (Exception e) { e.printStackTrace(); } return stored; } public static File getImage(String imagename) { File mediaImage = null; try { String root = Environment.getExternalStorageDirectory().toString(); File myDir = new File(root); if (!myDir.exists()) return null; mediaImage = new File(myDir.getPath() + "/.yourspecificdirectory/"+imagename); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return mediaImage; } public static boolean checkifImageExists(String imagename) { Bitmap b = null ; File file = ImageStorage.getImage("/"+imagename+".jpg"); String path = file.getAbsolutePath(); if (path != null) b = BitmapFactory.decodeFile(path); if(b == null b.equals("")) { return false ; } return true ; } } Then To access the images first check if it is already there if not then download if(ImageStorage.checkifImageExists(imagename)) { File file = ImageStorage.getImage("/"+imagename+".jpg"); String path = file.getAbsolutePath(); if (path != null){ b = BitmapFactory.decodeFile(path); imageView.setImageBitmap(b); } } else { new GetImages(imgurl, imageView, imagename).execute() ; } shareimprove this answer edited Feb 4 '16 at 2:46 Venkat Kotra 6,28922733 answered Apr 24 '14 at 12:50 Nasz Njoka Sr. – Facebook's Fresco is the newest and (IMO) the most advanced library that takes image management to a new level: from keeping Bitmaps off the java heap (prior to Lollipop) to supporting animated formats and progressive JPEG streaming. 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You can also register a BroadcastReceiver to get notified after you download is complete. But you're right at some point, since there's a write method, there also should be a read method for the sake of completeness. params) { Bitmap bitmap = null; HttpURLConnection connection = null; InputStream is = null; ByteArrayOutputStream out = null; try { connection = (HttpURLConnection) new URL(imageUrl).openConnection(); if (displayProgress) { connection.connect(); final int length = connection.getContentLength(); if (length () { private ImageError error; Override protected Void doInBackground(Void. Fresco uses Drawees to display images, you can think of them as of ImageViews: As you can see, a lot of stuff (including transformation options) gets already defined in XML, so all you need to do to display an image is a one-liner: mDrawee.setImageURI(Uri.parse(url)); Fresco provides an extended customization API, which, under circumstances, can be quite complex and requires the user to read the docs carefully (yes, sometimes you need to RTFM) 5a02188284
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