Comment télécharger et enregistrer une image dans Android

Question

Comment télécharger et enregistrer une image à partir d'une url donnée dans Android ?

Answer 1

Code pour télécharger l'image dans Android studio :

    DownloadManager downloadManager = 
         (DownloadManager)getSystemService(Context.DOWNLOAD_SERVICE);
    Uri uri = Uri.parse(url);
    DownloadManager.Request request = new DownloadManager.Request(uri);
    request.setNotificationVisibility
         (DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    downloadManager.enqueue(request);
    FancyToast.makeText(getApplicationContext(), "Downloaded", 
       FancyToast.LENGTH_SHORT, FancyToast.SUCCESS, false).show();

Answer 2

Ce code fonctionne parfaitement dans mon projet

downloadImagesToSdCard(imagepath,imagepath);

private void downloadImagesToSdCard(String downloadUrl,String imageName)
        {
            try
            {
                URL url = new URL("www.xxx.com"+downloadUrl); 
                /* making a directory in sdcard */
            //  String sdCard=Environment.getExternalStorageDirectory().toString();
                ContextWrapper cw = new ContextWrapper(getActivity());
                 // path to /data/data/yourapp/app_data/imageDir
                File directory = cw.getDir("files", Context.MODE_PRIVATE);

                File myDir = new File(directory,"folder");

                /*  if specified not exist create new */
                if(!myDir.exists())
                {
                    myDir.mkdir();
                    Log.v("", "inside mkdir");
                }

                /* checks the file and if it already exist delete */
                String fname = imageName;
                File file = new File (myDir, fname);
                Log.d("file===========path", ""+file);
                if (file.exists ()) 
                    file.delete (); 

                /* Open a connection */
                URLConnection ucon = url.openConnection();
                InputStream inputStream = null;
                HttpURLConnection httpConn = (HttpURLConnection)ucon;
                httpConn.setRequestMethod("GET");
                httpConn.connect();
                inputStream = httpConn.getInputStream();
                /*if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) 
                {
                    inputStream = httpConn.getInputStream();
                }*/

                FileOutputStream fos = new FileOutputStream(file);  
                int totalSize = httpConn.getContentLength();
                int downloadedSize = 0;   
                byte[] buffer = new byte[1024];
                int bufferLength = 0;
                while ( (bufferLength = inputStream.read(buffer)) >0 ) 
                {                 
                    fos.write(buffer, 0, bufferLength);                  
                    downloadedSize += bufferLength;                 
                    Log.i("Progress:","downloadedSize:"+downloadedSize+"totalSize:"+ totalSize) ;
                }   

                fos.close();
                Log.d("test", "Image Saved in sdcard..");  
                viewimage();
            }
            catch(IOException io)
            {                  
                io.printStackTrace();
            }
            catch(Exception e)
            {                     
                e.printStackTrace();
            }

        } 

        public void viewimage()
        {
              String path = serialnumber+".png";
               ContextWrapper cw = new ContextWrapper(getActivity());

                //path to /data/data/yourapp/app_data/dirName
                File directory = cw.getDir("files", Context.MODE_PRIVATE);

                File mypath=new File(directory,"folder/"+path);

                Bitmap b;
                try {
                    b = BitmapFactory.decodeStream(new FileInputStream(mypath));
                //  b.compress(format, quality, stream)
                    profile_image.setImageBitmap(Bitmap.createScaledBitmap(b, 120, 120, false));
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
        }

Answer 3

Essayez ceci

 try
                {
                    Bitmap bmp = null;
                    URL url = new URL("Your_URL");
                    URLConnection conn = url.openConnection();
                    bmp = BitmapFactory.decodeStream(conn.getInputStream());
                    File f = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis() + ".jpg");
                    if(f.exists())
                        f.delete();
                    f.createNewFile();
                    Bitmap bitmap = bmp;
                    ByteArrayOutputStream bos = new ByteArrayOutputStream();
                    bitmap.compress(Bitmap.CompressFormat.PNG, 0 /*ignored for PNG*/, bos);
                    byte[] bitmapdata = bos.toByteArray();
                    FileOutputStream fos = new FileOutputStream(f);
                    fos.write(bitmapdata);
                    fos.flush();
                    fos.close();
                    Log.e(TAG, "imagepath: "+f );
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }

Answer 4

public class testCrop extends AppCompatActivity {
    ImageView iv;
    String imagePath = "https://style.pk/wp-content/uploads/2015/07/omer-Shahzad-performed-umrah-600x548.jpg";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.testcrpop);
        iv = (ImageView) findViewById(R.id.testCrop);
        imageDownload image = new imageDownload(testCrop.this, iv);
        image.execute(imagePath);
    }
    class imageDownload extends AsyncTask<String, Integer, Bitmap> {
        Context context;
        ImageView imageView;
        Bitmap bitmap;
        InputStream in = null;
        int responseCode = -1;
//constructor.
        public imageDownload(Context context, ImageView imageView) {
            this.context = context;
            this.imageView = imageView;
        }
        @Override
        protected void onPreExecute() {
        }
        @Override
        protected Bitmap doInBackground(String... params) {
            try {
                URL url = new URL(params[0]);
                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                httpURLConnection.setDoOutput(true);
                httpURLConnection.connect();
                responseCode = httpURLConnection.getResponseCode();
                if (responseCode == HttpURLConnection.HTTP_OK) {
                    in = httpURLConnection.getInputStream();
                    bitmap = BitmapFactory.decodeStream(in);
                    in.close();
                }
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return bitmap;
        }
        @Override
        protected void onPostExecute(Bitmap data) {
            imageView.setImageBitmap(data);
            saveImage(data);
        }

        private void saveImage(Bitmap data) {
            File createFolder = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),"test");
            createFolder.mkdir();
            File saveImage = new File(createFolder,"downloadimage.jpg");
            try {
                OutputStream outputStream = new FileOutputStream(saveImage);
                data.compress(Bitmap.CompressFormat.JPEG,100,outputStream);
                outputStream.flush();
                outputStream.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

SORTIE

Assurez-vous que vous avez ajouté la permission d'écrire des données dans la mémoire.

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Answer 5

Le post de @Droidman est assez complet. Volley fonctionne bien avec de petites données de quelques kbytes. Lorsque j'ai essayé d'utiliser le fichier 'BasicImageDownloader.java', Android Studio m'a averti que la classe AsyncTask devait être statique ou qu'il pouvait y avoir des fuites. J'ai utilisé Volley dans une autre application de test et celle-ci n'a cessé de planter à cause des fuites. Je suis donc inquiet d'utiliser Volley pour le téléchargeur d'images (les images peuvent faire quelques 100 kB).

J'ai utilisé Picasso et cela a bien fonctionné, il y a un petit changement (probablement une mise à jour de Picasso) par rapport à ce qui est posté ci-dessus. Le code ci-dessous a fonctionné pour moi :

    public static void imageDownload(Context ctx, String url){
    Picasso.get().load(yourURL)
            .into(getTarget(url));
}
private static Target getTarget(final String url){

    Target target2 = new Target() {
        @Override
        public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) {
            new Thread(new Runnable() {

                @Override
                public void run() {

                    File file = new File(localPath + "/"+"YourImageFile.jpg");
                    try {
                        file.createNewFile();
                        FileOutputStream ostream = new FileOutputStream(file);
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 80, ostream);
                        ostream.flush();
                        ostream.close();
                    } catch (IOException e) {
                        Log.e("IOException", e.getLocalizedMessage());
                    }
                }
            }).start();
        }

        @Override
        public void onBitmapFailed(Exception e, Drawable errorDrawable) {
        }

        @Override
        public void onPrepareLoad(Drawable placeHolderDrawable) {
        }
    };
    return target;
}