需求是这样的：

在应用程序的详情介绍时，有评论的版块，该页评论最多显示5条，而每条最大字数是140个字符，每条评论可能根据字数不同，所占据的高度也不一样，如有的是1行，有的是2、3行，且评论可以翻页。

图片效果如下：

如何解决这样的问题呢？

首先必须知道的是评论控件不要固定不变，而是需要动态计算并动态添加到显示面板中的。

下面通过实例来说一下。

1.定义布局

定义布局的时候，可以用AbsoluteLayout,因为高度是动态量取的，所以具体坐标是可以求得的。参考如下：

2.显示数据

显示数据，需要根据数据来计算高度，首先把数据设置到控件中，然后通过View.measure(int widthMeasureSpec, int heightMeasureSpec)量取高度,并为该View设置坐标。参考代码：

/**
	 * 初始化、动态计算高度
	 */
	public void initCommentView() {
		record_temp = new CommentRecord();
		mPositionRecord = new ArrayList();
		mHeightRecord = new ArrayList();
		int currentHeight = 0;

		int maxNum = cachedComments.size();
		int sum = 0;
		for (int i = comment_begin_index; i < maxNum; i++) {
			if (null != mCommentCache && !mCommentCache.empty()) {
				comment_temp = mCommentCache.pop();
			} else {
				comment_temp = new CommentSimpleView(mContext);
			}
			mCommentUI.add(comment_temp);

			comment_temp.setData(cachedComments.get(i));
			comment_temp.measure(width, height);
			if (MAX_COMMENT_HEIGHT > currentHeight) {
				comment_content.addView(
						comment_temp,
						new AbsoluteLayout.LayoutParams(1386, comment_temp
								.getMeasuredHeight(), 0, FIRST_COMMENT_INTERVAL
								+ currentHeight));
				mPositionRecord.add(FIRST_COMMENT_INTERVAL + currentHeight);
				mHeightRecord.add(comment_temp.getMeasuredHeight());
				currentHeight = currentHeight
						+ comment_temp.getMeasuredHeight();
				comment_end_index++;
				sum++;
				if (sum < 5) {
					comment_temp.show_Divider();
				} else if (sum == 5) {
					comment_temp.hide_Divider();
				}
			}
			if (MAX_COMMENT_HEIGHT < currentHeight) {
				compareHeight = 1;
				isEnd = false;
				RelativeLayout.LayoutParams rl = (LayoutParams) comment_content
						.getLayoutParams();
				rl.setMargins(0, 60, 0, 0);
				rl.width = 1386;
				rl.height = MAX_COMMENT_HEIGHT+20;
				comment_content.setLayoutParams(rl);
				break;
			}
			if (MAX_COMMENT_HEIGHT == currentHeight) {
				compareHeight = 0;
				if (maxNum == comment_end_index) {
					isEnd = true;
					comment_pagedown.setFocusStatus(false);
				} else {
					isEnd = false;
				}
			}

		}
		record_temp.setHeightRecord(mHeightRecord);
		record_temp.setPositionRecord(mPositionRecord);
		record_temp.setBegin_index(comment_begin_index);
		record_temp.setEnd_index(comment_end_index);
		if (MAX_COMMENT_HEIGHT > currentHeight) {
			isEnd = true;
			comment_pagedown.setFocusStatus(false);
		}

	}

int width = MeasureSpec.makeMeasureSpec(1386, MeasureSpec.EXACTLY);
int height = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
 

3.翻页动态计算实现

/**
	 * 点击下一页时，判断是否有空间剩余，若有剩余则用上一页数据补充,false:无剩余
	 * @return
	 */
	private boolean hasExtraSpace() {
		if(null != cachedComments && cachedComments.size()-comment_end_index >=5){ //剩下的评论大于5条
			return false;
		}
		int beginIndex = 0;
		if(1 == compareHeight){
			beginIndex = comment_end_index;
		}else if(0 == compareHeight){
			beginIndex = comment_end_index+1;
		}
		int maxSize = cachedComments.size();
		int HeightSum = 0;
		for(int i = beginIndex;i position = record_temp.getPositionRecord();
		List height = record_temp.getHeightRecord();
		if(null == position || null == height){
			return;
		}
		int m = 0;
		for(int i= begin;i<=end;i++){
			if(null != mCommentCache && !mCommentCache.empty()){
				comment_temp = mCommentCache.pop();
			}else{
				comment_temp = new CommentSimpleView(mContext);
			}	
			mCommentUI.add(comment_temp);
			comment_temp.setData(cachedComments.get(i));
			comment_content.addView(comment_temp, new AbsoluteLayout.LayoutParams(1386,height.get(m), 0, position.get(m)));
			m++;
			if(5 == m){
				comment_temp.hide_Divider();
			}else{
				comment_temp.show_Divider();
			}
		}
		isEnd = false;
		comment_begin_index = begin;
		comment_end_index = end;
	}

4.点击上一页、下一页事件处理

public class comment_pageup_click implements OkButtonViewClick {

		@Override
		public void onOkButtonViewClick() {
			if(1 == currentPage){
//				Toast.makeText(mContext, 已是第一页, Toast.LENGTH_SHORT).show();
				comment_pageup.setFocusStatus(false);
				return;
			}else{
				currentPage = currentPage - 1;
				comment_content.removeAllViews();
				while (!mCommentUI.isEmpty()) {
					mCommentCache.push(mCommentUI.remove(0));
				}
				showPageUp();
				comment_pagedown.setFocusStatus(true);
			}
		
		}
	}

	class comment_pagedown_click implements OkButtonViewClick {

		@Override
		public void onOkButtonViewClick() {
			if(isEnd){
//				Toast.makeText(mContext, 已是最后一页, Toast.LENGTH_SHORT).show();
				comment_pagedown.setFocusStatus(false);
				return;
			}
			else if(!isEnd){ //不到最后一页
				if(!hasExtraSpace()){ //下一页无剩余空间，即该页不是倒数第二页
					mCommentRecord.push(record_temp);
					currentPage = currentPage + 1;
					if(1 == compareHeight){
						comment_begin_index = comment_end_index;
						comment_end_index --;
					}else{
						comment_begin_index = comment_end_index+1;
					}
					if(currentPage%4 ==0){ //预加载数据
						ParserHelper.getParserHelper().requestComment(1, 30, 9, callback);
					}
					comment_content.removeAllViews();
					while (!mCommentUI.isEmpty()) {
						mCommentCache.push(mCommentUI.remove(0));
					}
					initCommentView();
				}else {    //下一页有剩余空间，即该页为倒数第二页
					mCommentRecord.push(record_temp);
					currentPage = currentPage + 1;
					comment_content.removeAllViews();
					while (!mCommentUI.isEmpty()) {
						mCommentCache.push(mCommentUI.remove(0));
					}
					showLastPage();
				}
				comment_pageup.setFocusStatus(true);
			}
		}
	}

5.下一页点击时保存状态，用作恢复。（用栈保存，入栈出栈）

package com.helios.module.commentData;

import java.util.List;

public class CommentRecord {
		int begin_index;
		int end_index;
		List  positionRecord;
		List  heightRecord;
		
		public CommentRecord() {
			super();
		}
		public int getBegin_index() {
			return begin_index;
		}
		public void setBegin_index(int begin_index) {
			this.begin_index = begin_index;
		}
		public int getEnd_index() {
			return end_index;
		}
		public void setEnd_index(int end_index) {
			this.end_index = end_index;
		}
		public List getPositionRecord() {
			return positionRecord;
		}
		public void setPositionRecord(List positionRecord) {
			this.positionRecord = positionRecord;
		}
		public List getHeightRecord() {
			return heightRecord;
		}
		public void setHeightRecord(List heightRecord) {
			this.heightRecord = heightRecord;
		}		   
}

6.总结语

ViewGroup.addView(View child, LayoutParams params)