ListView 和 RecyclerView 的对比分析

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        InputAppInfo appInfo = appList.get(position);
        ViewHolder viewHolder = null;
        if (convertView == null) {
            viewHolder = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(
                    R.layout.app_grid_item, null);
            viewHolder.image = (ImageView) convertView
                    .findViewById(R.id.app_grid_item_image);
            convertView.setTag(viewHolder);
        }
        viewHolder = (ViewHolder) convertView.getTag();
        
        /*
         *  业务逻辑代码省略
         */
        return convertView;
    }

/**
     * Base class for an Adapter
     *
     * <p>Adapters provide a binding from an app-specific data set to views that are displayed
     * within a {@link RecyclerView}.</p>
     *
     * @param <VH> A class that extends ViewHolder that will be used by the adapter.
     */
    public abstract static class Adapter<VH extends ViewHolder> {
        private final AdapterDataObservable mObservable = new AdapterDataObservable();
        private boolean mHasStableIds = false;

        /**
         * Called when RecyclerView needs a new {@link ViewHolder} of the given type to represent
         * an item.
         * <p>
         * This new ViewHolder should be constructed with a new View that can represent the items
         * of the given type. You can either create a new View manually or inflate it from an XML
         * layout file.
         * <p>
         * The new ViewHolder will be used to display items of the adapter using
         * {@link #onBindViewHolder(ViewHolder, int, List)}. Since it will be re-used to display
         * different items in the data set, it is a good idea to cache references to sub views of
         * the View to avoid unnecessary {@link View#findViewById(int)} calls.
         *
         * @param parent The ViewGroup into which the new View will be added after it is bound to
         *               an adapter position.
         * @param viewType The view type of the new View.
         *
         * @return A new ViewHolder that holds a View of the given view type.
         * @see #getItemViewType(int)
         * @see #onBindViewHolder(ViewHolder, int)
         */
        @NonNull
        public abstract VH onCreateViewHolder(@NonNull ViewGroup parent, int viewType);

        /**
         * Called by RecyclerView to display the data at the specified position. This method should
         * update the contents of the {@link ViewHolder#itemView} to reflect the item at the given
         * position.
         * <p>
         * Note that unlike {@link android.widget.ListView}, RecyclerView will not call this method
         * again if the position of the item changes in the data set unless the item itself is
         * invalidated or the new position cannot be determined. For this reason, you should only
         * use the <code>position</code> parameter while acquiring the related data item inside
         * this method and should not keep a copy of it. If you need the position of an item later
         * on (e.g. in a click listener), use {@link ViewHolder#getAdapterPosition()} which will
         * have the updated adapter position.
         *
         * Override {@link #onBindViewHolder(ViewHolder, int, List)} instead if Adapter can
         * handle efficient partial bind.
         *
         * @param holder The ViewHolder which should be updated to represent the contents of the
         *        item at the given position in the data set.
         * @param position The position of the item within the adapter's data set.
         */
        public abstract void onBindViewHolder(@NonNull VH holder, int position);


        ..........

}