關於ListView的基本使用，應該都很清楚。無非就是用一個ViewHolder快取，然後重用convertView。如下：

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ViewHolder viewHolder = null;
			if (convertView == null) {
				convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.chat_left_item_text, null);
				viewHolder = new ViewHolder();
				viewHolder.imageView = (ImageView) convertView.findViewById(R.id.chat_head_iv);
				convertView.setTag(viewHolder);
			} else {
				viewHolder = (ViewHolder) convertView.getTag();
			}
			return convertView;
		}

		class ViewHolder {
			ImageView imageView;
		}
 

private class ChatHeadAdapter extends BaseAdapter {

		@Override
		public int getCount() {
			return 50;
		}

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

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

		@Override
		public int getItemViewType(int position) {
			return position % 2;// Type 兩種 0和1
		}

		@Override
		public int getViewTypeCount() {
			return 2;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			int viewType = getItemViewType(position);
			LeftViewHolder leftViewHolder = null;
			RightViewHolder rightViewHolder = null;
			if (convertView == null) {
				if (viewType == 0) {// left
					convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.chat_left_item_text, null);
					leftViewHolder = new LeftViewHolder();
					leftViewHolder.leftImageView = (ImageView) convertView.findViewById(R.id.chat_head_iv);
					convertView.setTag(leftViewHolder);
				} else {
					convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.chat_right_item_text, null);
					rightViewHolder = new RightViewHolder();
					rightViewHolder.rightImageView = (ImageView) convertView.findViewById(R.id.chat_head_iv);
					convertView.setTag(rightViewHolder);
				}
			} else {
				if (viewType == 0) {// left
					leftViewHolder = (LeftViewHolder) convertView.getTag();
				} else {
					rightViewHolder = (RightViewHolder) convertView.getTag();
				}
			}

			if (viewType == 0) {// left
				leftViewHolder.leftImageView.setImageResource(R.drawable.head_temp_left);
			} else {
				rightViewHolder.rightImageView.setImageResource(R.drawable.head_temp_right);
			}

			return convertView;
		}

		class LeftViewHolder {
			ImageView leftImageView;
		}

		class RightViewHolder {
			ImageView rightImageView;
		}
	}
 

不知道是由於什麼原因，用了類似上面的方法來處理我的十幾個ItemViewType，還是會經常出現ViewItem的型別不正確，查詢很久也沒發現原因。

然後只能通過下面的設定，解決這個問題。

@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			int viewType = getItemViewType(position);
			LeftViewHolder leftViewHolder = null;
			RightViewHolder rightViewHolder = null;
			if (convertView == null||((Integer) convertView.getTag(R.id.tag_key_chat_item_type))!=viewType) {
				if (viewType == 0) {// left
					convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.chat_left_item_text, null);
					leftViewHolder = new LeftViewHolder();
					leftViewHolder.leftImageView = (ImageView) convertView.findViewById(R.id.chat_head_iv);
					convertView.setTag(R.id.tag_key_chat_item_view,leftViewHolder);
				} else {
					convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.chat_right_item_text, null);
					rightViewHolder = new RightViewHolder();
					rightViewHolder.rightImageView = (ImageView) convertView.findViewById(R.id.chat_head_iv);
					convertView.setTag(R.id.tag_key_chat_item_view,rightViewHolder);
				}
				convertView.setTag(R.id.tag_key_chat_item_type, viewType);
			} else {
				if (viewType == 0) {// left
					leftViewHolder = (LeftViewHolder) convertView.getTag(R.id.tag_key_chat_item_view);
				} else {
					rightViewHolder = (RightViewHolder) convertView.getTag(R.id.tag_key_chat_item_view);
				}
			}
			
			if (viewType == 0) {// left
				leftViewHolder.leftImageView.setImageResource(R.drawable.head_temp_left);
			} else {
				rightViewHolder.rightImageView.setImageResource(R.drawable.head_temp_right);
			}

			return convertView;
		}