La classe Imageloader crea una cartella lazylist nella galleria. Come evitarlo

Question

Sto usando la classe imageLoader per caricare le immagini dall'URL. Ma quelle tutte le immagini sono memorizzate nella galleria da un nome di cartella chiamato LazyList. Richiede fino a 40 -100 mb di memoria. Ma non voglio caricare quelle immagini dal momento che gli utenti potrebbero sentirsi a disagio. Scusa per il pessimo inglese.

Tutto funziona bene ma crea una cartella nella galleria e mostra tutte le immagini che utilizzano dalla mia app. Quindi sento che gli utenti si sentiranno a disagio dalla mia app.

Ecco il mio codice di ImageLoader ed inoltre collegamenti con poche altre classi anche

public class ImageLoader { 
MemoryCache memoryCache = new MemoryCache(); 
FileCache fileCache; 
private Map<ImageView, String> imageViews = Collections 
     .synchronizedMap(new WeakHashMap<ImageView, String>()); 
ExecutorService executorService; 

public ImageLoader(Context context) { 
    fileCache = new FileCache(context); 
    executorService = Executors.newFixedThreadPool(5); 
} 

final int stub_id = R.drawable.abs__ab_bottom_transparent_light_holo; 

public void DisplayImage(String url, ImageView imageView) { 
    imageViews.put(imageView, url); 
    Bitmap bitmap = memoryCache.get(url); 
    if (bitmap != null) 
     imageView.setImageBitmap(bitmap); 
    else { 
     queuePhoto(url, imageView); 
     imageView.setImageResource(stub_id); 
    } 
} 

private void queuePhoto(String url, ImageView imageView) { 
    PhotoToLoad p = new PhotoToLoad(url, imageView); 
    executorService.submit(new PhotosLoader(p)); 
} 

private Bitmap getBitmap(String url) { 
    File f = fileCache.getFile(url); 
    // from SD cache 
    Bitmap b = decodeFile(f); 
    if (b != null) 
     return b; 
    // from web 
    try { 
     Bitmap bitmap = null; 
     URL imageUrl = new URL(url); 
     HttpURLConnection conn = (HttpURLConnection) imageUrl 
       .openConnection(); 
     conn.setConnectTimeout(30000); 
     conn.setReadTimeout(30000); 
     conn.setInstanceFollowRedirects(true); 
     InputStream is = conn.getInputStream(); 
     OutputStream os = new FileOutputStream(f); 
     Utils.CopyStream(is, os); 
     os.close(); 
     bitmap = decodeFile(f); 
     return bitmap; 
    } catch (Exception ex) { 
     ex.printStackTrace(); 
     return null; 
    } 
} 

// decodes image and scales it to reduce memory consumption 
private Bitmap decodeFile(File f) { 
    try { 
     // decode image size 
     BitmapFactory.Options o = new BitmapFactory.Options(); 
     o.inJustDecodeBounds = true; 
     BitmapFactory.decodeStream(new FileInputStream(f), null, o); 
     // Find the correct scale value. It should be the power of 2. 
     final int REQUIRED_SIZE = 100; 
     int width_tmp = o.outWidth, height_tmp = o.outHeight; 
     int scale = 1; 
     while (true) { 
      if (width_tmp/2 < REQUIRED_SIZE 
        || height_tmp/2 < REQUIRED_SIZE) 
       break; 
      width_tmp /= 2; 
      height_tmp /= 2; 
      scale *= 2; 
     } 
     // decode with inSampleSize 
     BitmapFactory.Options o2 = new BitmapFactory.Options(); 
     o2.inSampleSize = scale; 
     return BitmapFactory.decodeStream(new FileInputStream(f), null, o2); 
    } catch (FileNotFoundException e) { 
    } 
    return null; 
} 

// Task for the queue 
private class PhotoToLoad { 
    public String url; 
    public ImageView imageView; 

    public PhotoToLoad(String u, ImageView i) { 
     url = u; 
     imageView = i; 
    } 
} 

class PhotosLoader implements Runnable { 
    PhotoToLoad photoToLoad; 

    PhotosLoader(PhotoToLoad photoToLoad) { 
     this.photoToLoad = photoToLoad; 
    } 

    @Override 
    public void run() { 
     if (imageViewReused(photoToLoad)) 
      return; 
     Bitmap bmp = getBitmap(photoToLoad.url); 
     memoryCache.put(photoToLoad.url, bmp); 
     if (imageViewReused(photoToLoad)) 
      return; 
     BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad); 
     Activity a = (Activity) photoToLoad.imageView.getContext(); 
     a.runOnUiThread(bd); 
    } 
} 

boolean imageViewReused(PhotoToLoad photoToLoad) { 
    String tag = imageViews.get(photoToLoad.imageView); 
    if (tag == null || !tag.equals(photoToLoad.url)) 
     return true; 
    return false; 
} 

// Used to display bitmap in the UI thread 
class BitmapDisplayer implements Runnable { 
    Bitmap bitmap; 
    PhotoToLoad photoToLoad; 

    public BitmapDisplayer(Bitmap b, PhotoToLoad p) { 
     bitmap = b; 
     photoToLoad = p; 
    } 

    public void run() { 
     if (imageViewReused(photoToLoad)) 
      return; 
     if (bitmap != null) 
      photoToLoad.imageView.setImageBitmap(bitmap); 
     else 
      photoToLoad.imageView.setImageResource(stub_id); 
    } 
} 

public void clearCache() { 
    memoryCache.clear(); 
    fileCache.clear(); 
} 
} 

Answer 1

ho ottenuto la mia soluzione cambiando il mio FileCache classe e sua cartella di destinazione

public class FileCache { 
    private File cacheDir; 
    private File nomediaFile; 
    String NOMEDIA = " .nomedia"; 
public FileCache(Context context) { 
    // Find the dir to save cached images 
    if (android.os.Environment.getExternalStorageState().equals(
      android.os.Environment.MEDIA_MOUNTED)) { 
     cacheDir = new File(Environment.getExternalStorageDirectory() 
       + "/mydir"); 
     if (cacheDir.mkdir()) { 
      nomediaFile = new File(
        Environment.getExternalStorageDirectory() + "/mydir/" 
          + NOMEDIA); 
      if (!nomediaFile.exists()) { 
       try { 
        nomediaFile.createNewFile(); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
      } 
     } 
    } else { 
     cacheDir = context.getCacheDir(); 
    } 
    if (!cacheDir.exists()) 
     cacheDir.mkdirs(); 
} 

public File getFile(String url) { 
    // I identify images by hashcode. Not a perfect solution, good for the 
    // demo. 
    // String filename=String.valueOf(url.hashCode()); 
    // Another possible solution (thanks to grantland) 
    @SuppressWarnings("deprecation") 
    String filename = URLEncoder.encode(url); 
    File f = new File(cacheDir, filename); 
    return f; 

} 

public void clear() { 
    File[] files = cacheDir.listFiles(); 
    if (files == null) 
     return; 
    for (File f : files) 
     f.delete(); 
} 
} 

Answer 2

È possibile utilizzare la libreria droidQuery per caricare le immagini da URL pigri, poi li cache una base per-sessione. Puoi anche gestire il tuo cacheing, come ad esempio SharedPreferences o un database SQLite. Per scaricare le immagini, utilizzare il metodo di lunga mano:

$.ajax(new AjaxOptions().url("http://www.example.com") 
         .type("GET") 
         .dataType("image") 
         .timeout(30000) 
         .cache(true) 
         .cacheTimeout(600000)//milliseconds 
         //consider using .imageWidth() or .imageHeight() methods to control output size 
         .success(new Function() { 
          @Override 
          public void invoke($ droidQuery, Object... params) { 
           myImageView.setImageBitmap((Bitmap) params[0]); 
           //save raw bitmap across sessions, maybe. 
          } 
         }); 

Per salvare i dati in un database o SharedPreferences, rileggere la documentazione: http://developer.android.com/guide/topics/data/data-storage.html