现在RecyclerView已经代替LisvView,但是个别时候我们还会用到，使用封装好的简单暴力！
listView的优化我就不说了，谷歌百度一大片，把封装好的ViewHolder和Adapter直接展示给大家
1.把Adapter封装成抽象类：
/** * 封装的adapter(泛型) 抽象类 * Created by cmh on 2018/1/8. */public abstract class DAdapter<T> extends BaseAdapter { private Context context; private List<T> datalist; public DAdapter(Context context) { this.context = context;
} //可以调用context public Context getContext() { return context;
} public List<T> getDatalist() { return datalist;
} public void setDatalist(List<T> datalist) { this.datalist = datalist;
} @Override public int getCount() { if (datalist!=null){ return datalist.size();
} return 0;
} @Override public Object getItem(int position) { return position;
} @Override public long getItemId(int position) { return position;
} //抽象方法 @Override public abstract View getView(int position, View convertView, ViewGroup parent);
}2.Adapter extends DAdapter<实体类>
/** * 继承封装好的adapter * Created by cmh on 2018/1/8. */public class FMyAdapter extends DAdapter<Hore>{ public FMyAdapter(Context context) { super(context);
} @Override public View getView(int position, View convertView, ViewGroup parent) { if (null==convertView){
convertView = LayoutInflater.from(getContext()).inflate(R.layout.plist_item,null);
} //viewHolder获取控件绑定convertView ImageView imageView = DViewHolder.get(convertView,R.id.img);
TextView textView = DViewHolder.get(convertView,R.id.tv);
Hore hore = getDatalist().get(position); //展示数据 imageView.setImageResource(hore.getResId());
textView.setText(hore.getName()); return convertView;
}
}3.封装ViewHolder(直接使用)
/** * 封装的viewholder * Created by cmh on 2018/1/8. */public class DViewHolder { public static <T extends View> T get(View view,int id){
SparseArray<View> viewHolder = (SparseArray<View>) view.getTag(); if (viewHolder==null){
viewHolder = new SparseArray<>();
view.setTag(viewHolder);
}
View childView = viewHolder.get(id); if (childView==null){
childView = view.findViewById(id);
viewHolder.put(id,childView);
} return (T) childView;
}
}
随时随地看视频