Comment puis-je rechercher sdcard pour les images dans Android?

Question

S'il vous plaît, comment puis-je rechercher des images de mon application sdcard de mon téléphone et ajouter les chemins à une liste ou un tableau?

c'est mon code actuel, mais ne retourne pas d'images

File images = Environment.getExternalStorageDirectory(); 
    File[] imagelist = images.listFiles(new ImageFileFilter()); 

    for(int x = 0; x < imagelist.length; x++){ 
     _ImageFiles.add(imagelist[x].getAbsolutePath()); 
} 


public class ImageFileFilter implements FileFilter{ 

    private final String[] AndroidExtensions = new String[] {"jpg", "png"}; 

    public boolean accept(File pathname) { 
     for (String extension : AndroidExtensions) 
     { 
      if (pathname.getName().toLowerCase().endsWith(extension)) 
      { 
      return true; 
      } 
     } 
     return false; 
    } 

} 

Merci.

Answer 1

Découvrez cette question similaire Load Image from SD Card

Answer 2

/** 
* Async task for loading the images from the SD card. 
*/ 
class LoadImagesFromSDCard extends AsyncTask<Object, LoadedImage, Object> { 
    /** 
    * Load images from SD Card in the background, and display each image on the screen. 
    * @see android.os.AsyncTask#doInBackground(Params[]) 
    */ 
    @Override 
    protected Object doInBackground(Object... params) { 
     // setProgressBarIndeterminateVisibility(true); 
     Bitmap bitmap = null; 
     Bitmap newBitmap = null; 
     Uri uri = null; 

     // Set up an array of the Thumbnail Image ID column we want 
     String[] projection = { MediaStore.Images.Thumbnails._ID }; 
     // Create the cursor pointing to the SDCard 
     Cursor cursor = managedQuery(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, projection, // Which columns to return 
       null, // Return all rows 
       null, null); 
     int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID); 
     int size = cursor.getCount(); 
     // If size is 0, there are no images on the SD Card. 
     if (size == 0) { 
      // No Images available, post some message to the user 
     } 

     // This will remember ACTUAL positions with existing bitmaps! 
     mRealBitmapsIndexes = new ArrayList<Integer>(); 

     int imageID = 0; 
     boolean run = true; 
     for (int i = 0; i < size; i++) {     
      try { 
       if(cursor != null && !cursor.isClosed() && run){ //if the user quits before all the images are loaded, the cursor will be closed 
        cursor.moveToPosition(i); 
        imageID = cursor.getInt(columnIndex); 
        uri = Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageID); 
        //temp 
        bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri)); 

        if (bitmap != null) { 
         mRealBitmapsIndexes.add(i); 
         newBitmap = Bitmap.createScaledBitmap(bitmap, GRID_IMG_WIDTH, GRID_IMG_HEIGHT, true); 
         bitmap.recycle(); 
         if (newBitmap != null) { 
          publishProgress(new LoadedImage(newBitmap)); 
         } 
        } 
       } 
      } catch (OutOfMemoryError e) { 
       run = false; 
       Toast.makeText(LoadImagesViaGridActivity.this, R.string.lowMemoryErrorUnableDisplImages, Toast.LENGTH_LONG).show(); 
      } 
      catch (Exception e) { 
       e.printStackTrace(); 
       //Toast.makeText(LoadImagesViaGridActivity.this, R.string.errorUnableDisplImages, Toast.LENGTH_LONG).show(); 
      } 
     } 
     if(cursor != null && !cursor.isClosed()) 
      cursor.close(); 
     return null; 
    } 

    /** 
    * Add a new LoadedImage in the images grid. 
    * @param value The image. 
    */ 
    @Override 
    public void onProgressUpdate(LoadedImage... value) { 
     addImage(value); 
    } 

    /** 
    * Set the visibility of the progress bar to false. 
    * @see android.os.AsyncTask#onPostExecute(java.lang.Object) 
    */ 
    @Override 
    protected void onPostExecute(Object result) { 
     setProgressBarIndeterminateVisibility(false); 
    } 
}