多条目加载适配器

public class MyAdapter extends BaseAdapter {
    Context context;
    List<DataDataBean.ResultBean.ListBean> list;

    private int TYTLE_ONLY = 0;//只有文字的形式
    private int IMAGE_LEFT = 1;//表示图片在左边,文字在右边
    private int IMAGE_RIGHT = 2;//* 2表示图片在右边,文字在左边
    private int IMAGE_BOTTOM = 3;// * 3表示文字在上边,图片在下面

    public MyAdapter(Context context, List<DataDataBean.ResultBean.ListBean> list) {
        this.context = context;
        this.list = list;
    }

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

    @Override
    public Object getItem(int i) {
        return list.get(i);
    }

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

    /**
     * 1.适配器中重写这个getViewTypeCount方法...得到视图类型的数量,,,也就是listView要展示多少种不同的视图
     * @return
     */
    @Override
    public int getViewTypeCount() {
        return 4;
    }

 
    @Override
    public int getItemViewType(int position) {

        if (position%4 == 0){
            return TYTLE_ONLY;
        }else if (position %4==1){
            return IMAGE_LEFT;
        }else if (position %4==2){
            return IMAGE_RIGHT;
        }

        return IMAGE_BOTTOM;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {

        //在做优化之前先判断一下当前条目展示的是哪一种类型,,,然后再进行关联布局进行优化
        if (getItemViewType(i) == TYTLE_ONLY){

            TitleHolder holder;
            if (view == null){
                view = View.inflate(context, R.layout.item_title_layout,null);
                holder = new TitleHolder();

                holder.textView = view.findViewById(R.id.text_title);

                view.setTag(holder);
            }else {
                holder = (TitleHolder) view.getTag();
            }

            //赋值
            holder.textView.setText(list.get(i).getTitle());

        }else if (getItemViewType(i) == IMAGE_LEFT){
            ImageLeftHolder holder;
            if (view == null){
                view = View.inflate(context, R.layout.item_layout,null);
                holder = new ImageLeftHolder();

                holder.textView = view.findViewById(R.id.text_title);
                holder.imageView = view.findViewById(R.id.image_view);

                view.setTag(holder);
            }else {
                holder = (ImageLeftHolder) view.getTag();
            }

            //赋值
            holder.textView.setText(list.get(i).getTitle());

            //显示图片
            ImageLoader.getInstance().displayImage(list.get(i).getFirstImg(),holder.imageView, ImageLoaderUtil.getDefaultOption());

        }else if (getItemViewType(i) == IMAGE_RIGHT){

            ImageRightHolder holder;
            if (view == null){
                view = View.inflate(context, R.layout.item_right_layout,null);
                holder = new ImageRightHolder();

                holder.textView = view.findViewById(R.id.text_title);
                holder.imageView = view.findViewById(R.id.image_view);

                view.setTag(holder);
            }else {
                holder = (ImageRightHolder) view.getTag();
            }

            //赋值
            holder.textView.setText(list.get(i).getTitle());

            //显示图片
            ImageLoader.getInstance().displayImage(list.get(i).getFirstImg(),holder.imageView, ImageLoaderUtil.getDefaultOption());


        }else if (getItemViewType(i) == IMAGE_BOTTOM){
            ImageBottomHolder holder;
            if (view == null){
                view = View.inflate(context, R.layout.item_bottom_layout,null);
                holder = new ImageBottomHolder();

                holder.textView = view.findViewById(R.id.text_title);
                holder.imageView = view.findViewById(R.id.image_view);

                view.setTag(holder);
            }else {
                holder = (ImageBottomHolder) view.getTag();
            }

            //赋值
            holder.textView.setText(list.get(i).getTitle());

            //显示图片
            ImageLoader.getInstance().displayImage(list.get(i).getFirstImg(),holder.imageView, ImageLoaderUtil.getDefaultOption());


        }

        return view;
    }

    private class TitleHolder{
        TextView textView;
    }
    private class ImageLeftHolder{
        TextView textView;
        ImageView imageView;
    }
    private class ImageRightHolder{
        TextView textView;
        ImageView imageView;
    }
    private class ImageBottomHolder{
        TextView textView;
        ImageView imageView;
    }

}