android view holder 优化
16lz
2021-01-23
android 一般都用viewholder来优化contentView,采用sparseArray能够进一步优化
/** * 用法: ImageView bananaView = ViewHolder.get(convertView, R.id.banana); * * @param convertView * @param id * @return */@SuppressWarnings("unchecked")public static <T extends View> T getView(View convertView, int id) {SparseArray<View> viewHolder = (SparseArray<View>) convertView.getTag();if (viewHolder == null) {viewHolder = new SparseArray<View>();convertView.setTag(viewHolder);}View childView = viewHolder.get(id);if (childView == null) {childView = convertView.findViewById(id);viewHolder.put(id, childView);}return (T) childView;}
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