在列表中控制 AsyncTask 加载 bitmap 的时机_async task scanbitmap-优快云博客

本文链接：https://blog.youkuaiyun.com/ixiaobu/article/details/8867618

本文介绍了一个基于Android的应用中实现滑动监听的方法，并详细解释了如何根据滑动状态来控制图片的加载行为，以提高用户体验和应用性能。

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//滑动控制
	private OnScrollListener mScrollListener=new OnScrollListener(){
		@Override
		public void onScrollStateChanged(AbsListView view,int scrollState){
			if(scrollState==OnScrollListener.SCROLL_STATE_FLING){
				Log.d(TAG,"luzechun scroll fling");
					isLoadThumbNail=false;
				
			}else if(scrollState==OnScrollListener.SCROLL_STATE_IDLE||
					scrollState==OnScrollListener.SCROLL_STATE_TOUCH_SCROLL){
				Log.d(TAG,"luzechun scroll not fling");
				if(!isLoadThumbNail){
					isLoadThumbNail=true;
					mStaticScreemAdapter.notifyDataSetChanged();
				}
			}
		}
		@Override
		public void onScroll(AbsListView arg0,int arg1,int arg2,int arg3){
			
		}
	};

	private class LocalStaticScreenAdapter extends AbstractScreenAdapter{
		
		public LocalStaticScreemAdapter(Context context,List<String>items){
			super(context, items);
		}
		
		@SuppressLint("NewApi")
		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
    		ViewHolder holder = null;
    		if (convertView == null) {
        		convertView =inflateLayout(R.layout.static_screem_thumbnail_layout, null);
        		holder = new ViewHolder();
        		holder.mImageView =(ImageView)convertView.findViewById(R.id.ItemImage);
        		convertView.setTag(holder);
    		} else {
        		holder = (ViewHolder)convertView.getTag();
    		}
    		String path=(String)getItem(position);

    		//isLoadThumbNail标识是否可以加载 bitmap
    		mDynWallpaperLoader.load(path, holder.mImageView, !isLoadThumbNail);
    
    		return convertView;
		}
	}

	public static class ViewHolder {
        	public ImageView mImageView;
    }