android - 同时滚动三个 GridView

Question

我试图将三个甚至四个 GridView 放在一个布局中并同时滚动它们。

由于 GridView 有自己的 ScrollView 小部件，我需要通过 android:isScrollContainer="false"禁用那个 ScrollView 属性并覆盖 GrideView 度量以具有 wrap_content 功能，这是我扩展的 GrideView:

public class ExpandedGridView extends GridView
{
    public ExpandedGridView (Context context)
    {
        super(context);
    }

    public ExpandedGridView (Context context, AttributeSet attrs)
    {
        super(context, attrs);
    }

    public gridView(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        // Calculate entire height by providing a very large height hint.
        // But do not use the highest 2 bits of this integer; those are
        // reserved for the MeasureSpec mode.
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE / 2, MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    }
}

它在工作，但是它禁用了一些 BaseAdapter 的服务程序，例如回收、重用等等...，所以这使我的 GridView 滚动缓慢而且它不是够流畅!

关于如何让它更快的任何想法？

更新 1:添加了我的 GridAdapter 类:

public class GridAdapter extends BaseAdapter
{   
    private Context c;
    private DisplayImageOptions mOptions;
    private ImageLoader mImageLoader;
    private String[] appIconUri, appName, appPrice, appRate;

    public GridAdapter(Context c, String[] appIconUri, String[] appName
            , String[] appPrice, String[] appRate) 
    {
        this.appIconUri = appIconUri;
        this.appName = appName;
        this.appPrice = appPrice;
        this.appRate = appRate;
        this.c = c;

        // Setup ImageLoader
        this.mImageLoader = ImageLoader.getInstance();

        this.mOptions = new DisplayImageOptions.Builder()
            .showStubImage(R.drawable.border)
            .showImageForEmptyUri(R.drawable.border)
            .imageScaleType(ImageScaleType.IN_SAMPLE_INT)
            .bitmapConfig(Bitmap.Config.RGB_565)
            .resetViewBeforeLoading()
            .cacheOnDisc() 
            .displayer(new FadeInBitmapDisplayer(750))
            .build();

        if (!mImageLoader.isInited())
        {
            ImageLoaderConfiguration mImageLoaderConfiguration = new ImageLoaderConfiguration.Builder(c)
                .threadPoolSize(2) 
                .memoryCache(new WeakMemoryCache())
                .discCacheFileNameGenerator(new Md5FileNameGenerator())
                .build();
            mImageLoader.init(mImageLoaderConfiguration);
        }
    }

    public ImageLoader getCurrentImageLoader()
    {
        return mImageLoader;
    }

    @Override
    public int getCount() 
    {
        return appName.length;
    }

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {       
       ViewHolder mViewHolder;

        if (convertView == null) 
        {
            LayoutInflater mLayoutInflater = ((Activity) c).getLayoutInflater();
            convertView = mLayoutInflater.inflate(R.layout.grid_list, null);

            mViewHolder = new ViewHolder();

            mViewHolder.lblName = (textView) convertView.findViewById(R.id.appName);
            mViewHolder.lblPrice = (textView) convertView.findViewById(R.id.appPrice);
            mViewHolder.rtbRate = (RatingBar) convertView.findViewById(R.id.appRate);
            mViewHolder.imgIcon = (ImageView) convertView.findViewById(R.id.appIcon);

            convertView.setTag(mViewHolder);
        }
        else
            mViewHolder = (ViewHolder) convertView.getTag();

        mViewHolder.lblName.setText(appName[position]);

        // This line should be changed
        mViewHolder.lblPrice.setText((Integer.valueOf(appPrice[position]) == 0) ? "مجانی" : appPrice[position]);

        mViewHolder.lblPrice.setGravity(Gravity.RIGHT);
        mViewHolder.rtbRate.setRating(appRate[position] != null ? Float.valueOf(appRate[position]) : 0);

        mImageLoader.displayImage(appIconUri[position], mViewHolder.imgIcon, mOptions);

        return convertView;
    }

    private static class ViewHolder
    {
        textView lblName, lblPrice;
        RatingBar rtbRate;
        ImageView imgIcon;
    }

Answer 1

快速搜索后，我找到了一个已经有人创建的库 http://tonicartos.github.io/StickyGridHeaders/无需重新发明轮子。