Android 适配器之ViewHoder最新写法

从他处看到的这里记录备用。

class ViewHolder:

import android.util.SparseArray;
import android.view.View;

public class ViewHolder {
	 @SuppressWarnings("unchecked")
	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>();
	            view.setTag(viewHolder);
	        }
	        View childView = viewHolder.get(id);
	        if (childView == null) {
	            childView = view.findViewById(id);
	            viewHolder.put(id, childView);
	        }
	        return (T) childView;
	    }
}

adapter内或者其他View里面通用，这里以继承baseAdapter为例：

@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		if (convertView == null) {
			convertView = inflater.inflate(R.layout.item, parent, false);
		}

		TextView tv = ViewHolder.get(convertView, R.id.name);
		tv.setText(getItem(position));
		
		return convertView;
	}