使用ViewHolder模式优化ListView

最新推荐文章于 2025-05-08 11:53:37 发布

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最新推荐文章于 2025-05-08 11:53:37 发布

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本文链接：https://blog.youkuaiyun.com/wjb857999880/article/details/50294949

本文介绍了一个名为PaperListAdapter的自定义适配器类的实现细节。该类继承自BaseAdapter，用于处理Paper数据对象列表，并将其展示在Android应用的列表视图中。适配器通过ViewHolder模式提高视图的复用效率，同时为每个列表项提供点击事件处理。

public class PaperListAdapter extends BaseAdapter{

    private List<Paper> paperData;
    private LayoutInflater mInflater;
    private Context context;

    public PaperListAdapter(Context context,List<Paper> data){
        this.paperData=data;
        this.context = context;
        mInflater = LayoutInflater.from(context);
    }

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

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

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

    @Override
    public View getView(int position, View view, ViewGroup viewGroup) {
        ViewHolder holder = null;
        if(view==null){
            holder = new ViewHolder();
            view = mInflater.inflate(R.layout.paper_list_item,null);
            holder.paperName=(TextView)view.findViewById(R.id.paper_name);
            view.setTag(holder);
        }else{
            holder=(ViewHolder)view.getTag();
        }
        holder.paperName.setText(paperData.get(position).getPaperName());
        holder.btn = (Button) view.findViewById(R.id.start_test);
        holder.btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Logger.i("跳转");
                Intent i = new Intent(context, RegisterActivity.class);
                context.startActivity(i);
            }
        });
        return view;
    }

    public final class ViewHolder{
        public TextView paperName;
        public Button btn;
    }
}