Universal Image Loader - listView 被清除

Question

几个小时前，我询问了关于 AUIL 调用太多 getView() 的问题。 (Universal Image Loader - call too many getView())

通过解答，我解决了getView()调用次数过多的问题。但是，我仍然有问题。当 activity 启动时，我可以看到列表。但是，不久之后，列表视图被删除（或清除）。列表视图中没有图像出现或加载。

这是我的源代码。

public class MainActivity extends Activity{
    AsyncTask<Void, Void, Void> asyncTask, registerTask;
    DisplayImageOptions options;
    ArrayList<HashMap<String, Object>> feedList = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);

        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);

        int cacheSize = ((ActivityManager)getSystemService(Context.ACTIVITY_SERVICE)).getMemoryClass() * 1024 * 1024 / 8;

        ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this)
            .memoryCacheExtraOptions(metrics.widthPixels, metrics.heightPixels)
            .diskCacheExtraOptions(metrics.widthPixels, metrics.heightPixels, null)
            .memoryCache(new LruMemoryCache(cacheSize))
            .memoryCacheSize(cacheSize)
            .memoryCacheSizePercentage(13) 
            .diskCache(new UnlimitedDiscCache(StorageUtils.getCacheDirectory(this)))
            .diskCacheSize(100 * 1024 * 1024)
            .diskCacheFileCount(200)
            .diskCacheFileNameGenerator(new HashCodeFileNameGenerator())
            .imageDownloader(new BaseImageDownloader(this))
            .imageDecoder(new BaseImageDecoder(false))
            .defaultDisplayImageOptions(DisplayImageOptions.createSimple())
            .build();
        ImageLoader.getInstance().init(config);

        options = new DisplayImageOptions.Builder()
            .showImageOnLoading(R.drawable.ic_stub)
            .showImageForEmptyUri(R.drawable.ic_empty)
            .showImageOnFail(R.drawable.ic_error)
            .cacheInMemory(true)
            .cacheOnDisk(true)
            .considerExifParams(true)
            .displayer(new RoundedBitmapDisplayer(20))
            .build();

        asyncTask = new AsyncTask<Void, Void, Void>() {
            protected Void doInBackground(Void... params) {
                StyleFeedServerUtils serverUtils = new StyleFeedServerUtils();
                feedList = serverUtils.getStyleFeedList(MainActivity.this);
                return null;
            }
            @Override
            protected void onPostExecute(Void result) {
                if(feedList != null && feedList.size() > 0){
                    final ListView listView = (ListView)findViewById(R.id.list);
                    listView.setAdapter(new ImageAdapter());
                    PauseOnScrollListener listener = new PauseOnScrollListener(ImageLoader.getInstance(), true, true);
                    listView.setOnScrollListener(listener);
                    listView.setOnItemClickListener(new OnItemClickListener() {
                        @Override
                        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                            Log.e("fashion", "onItemClick, position : "+position);
                        } 
                    });
                }
                asyncTask.cancel(!isCancelled());
                asyncTask = null;
            }
        };  
        asyncTask.execute(null, null, null);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (registerTask != null) {
            registerTask.cancel(true);
        }
        //GCMRegistrar.onDestroy(this);
        AnimateFirstDisplayListener.displayedImages.clear();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    class ImageAdapter extends BaseAdapter {
        private LayoutInflater inflater;
        private ImageLoadingListener animateFirstListener = new AnimateFirstDisplayListener();

        ImageAdapter() {
            inflater = LayoutInflater.from(MainActivity.this);
        }

        @Override
        public int getCount() {
            return feedList.size();
        }

        @Override
        public Object getItem(int position) {
            return position;
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            View view = convertView;
            if(convertView == null){
                view = inflater.inflate(R.layout.style_feed_list_view, parent, false);
                view.setTag((ImageView)view.findViewById(R.id.style_feed_image));
            }
            ImageLoader.getInstance().displayImage(feedList.get(position).get("URL").toString(), (ImageView)view.getTag(), options, animateFirstListener);

            return view;
        }
    } 

    private static class AnimateFirstDisplayListener extends SimpleImageLoadingListener {

        static final List<String> displayedImages = Collections.synchronizedList(new LinkedList<String>());

        @Override
        public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
            if (loadedImage != null) {
                ImageView imageView = (ImageView) view; 
                boolean firstDisplay = !displayedImages.contains(imageUri);
                if (firstDisplay) {
                    FadeInBitmapDisplayer.animate(imageView, 500);
                    displayedImages.add(imageUri);
                }
            }
        }
    }
}

请帮忙。

Answer 1

有时由于 RoundedBitmapDisplayer 只是评论 .displayer(new RoundedBitmapDisplayer(20)) 这一行并再次尝试运行而造成问题。如果您想使用圆形图像视图，请尝试下面的库 https://github.com/vinc3m1/RoundedImageView

Universal Image Loader - listView 被清除

Universal Image Loader - listView was cleared

android

listview

universal-image-loader