Android：ViewPager上的Universal Image Loader和ProgressBar无法正常工作

Question

我有一个适用于viewPgaer的适配器，我在ImageView上使用UIL缓存图像。我在加载图像时从未使用过ProgressBar，它工作得很好。我决定制作和进度条，但是当我打开活动时，进度条正在旋转，过了一会儿它就像它应该的那样消失但图像没有显示，此外我无法滑动到下一个图像。我不知道我做错了什么。谢谢:)）

ViewPager适配器

@Override
public Object instantiateItem(ViewGroup container, int position) {
    TouchImageView imgDisplay;

    inflater = (LayoutInflater) _activity
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View viewLayout = inflater.inflate(R.layout.layout_fullscreen_image, container,
            false);

    imgDisplay = (TouchImageView) viewLayout.findViewById(R.id.imgDisplay);
    final ProgressBar spinner = (ProgressBar) viewLayout.findViewById(R.id.progressBarFull);

    DisplayImageOptions options = new DisplayImageOptions.Builder()
            .cacheInMemory(true)
            .cacheOnDisk(true)
            .considerExifParams(true)
            .bitmapConfig(Bitmap.Config.RGB_565)
            .imageScaleType(ImageScaleType.EXACTLY_STRETCHED)
            .build();

    ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(_activity.getApplicationContext()).build();
    ImageLoader.getInstance().init(config);
    ImageLoader imageLoader = ImageLoader.getInstance();

    imageLoader.displayImage(_imagePaths.get(position), imgDisplay, options, new SimpleImageLoadingListener() {
        @Override
        public void onLoadingStarted(String imageUri, View view) {
            spinner.setVisibility(View.VISIBLE);
        }

        @Override
        public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
            spinner.setVisibility(View.GONE);
        }

        @Override
        public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
            spinner.setVisibility(View.GONE);
        }
    });

    ((ViewPager) container).addView(viewLayout);

    return viewLayout;
}

layout_fullscreen_image.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000">

<com.plushost.wizgr.TouchImageView
    android:id="@+id/imgDisplay"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:scaleType="fitCenter"
    android:background="#000000"/>

<ProgressBar
    style="?android:attr/progressBarStyleLarge"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/progressBarFull"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true"
    android:visibility="gone"/>

</RelativeLayout>

微调器消失后的活动屏幕截图