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Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
Uri mUri = Uri.parse("file://" + dir);
intent.setDataAndType(mUri, "image/*");
intent.setAction("android.intent.action.GET_CONTENT");
startActivityForResult(intent,REQUEST_TO_VIEW_THUMBNAIL_IMAGES);
Uri uri = data.getData();
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(uri, "image/*");
startActivityForResult(intent,REQUEST_TO_VIEW_IMAGE);