图片在系统相册中显示

private Uri exportToGallery(String filename) {    
  final ContentValues values = new ContentValues(2);    
  values.put(MediaStore.Video.Media.MIME_TYPE, "image/jpeg");    
  values.put(MediaStore.Video.Media.DATA, filename);   
  
  final Uri uri =  getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,            values);   
  sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,            
  Uri.parse("file://" + filename)));    

  return uri;
}