Android自动折行TextView Group

 package com.test.testview;

 import java.util.ArrayList;

 import android.content.Context;
 import android.graphics.Color;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.LinearLayout;
 import android.widget.TextView;

 import com.test.testview.R;

 public class HotwordsViewgroup extends LinearLayout implements
         View.OnClickListener
 {
     private final static int VIEW_MARGIN_HORIZONTAL = 50;
     private final static int VIEW_MARGIN_VERTICAL = 20;

     private HotwordsOnclickListener mHotwordsOnclickListener;

     public static interface HotwordsOnclickListener
     {
         /**
          * 触发onclik回调，根据TextView.getText去做相关事情
          *
          * @param view
          */
         public void hotwordOnclick(TextView view);
     }

     public HotwordsViewgroup(Context context, AttributeSet attrs)
     {
         super(context, attrs);
         init();
     }

     public HotwordsViewgroup(Context context, AttributeSet attrs, int defStyle)
     {
         super(context, attrs, defStyle);
         init();
     }

     public HotwordsViewgroup(Context context)
     {
         super(context);
         init();
     }

     /**
      * 设置每个关键词点击事件监听
      *
      * @param listener
      */
     public void setHotwordOnclickListener(HotwordsOnclickListener listener) {
         mHotwordsOnclickListener = listener;
     }

     private void init() {
         setOrientation(HORIZONTAL);
     }

     public void setData(final ArrayList<String> list) {
         removeAllViews();
         if (list != null) {
             for (int i = 0; i < list.size(); i++) {
                 String content = list.get(i);
                 if (TextUtils.isEmpty(content)) {
                     continue;
                 }
                 TextView textview = new TextView(getContext());
                 textview.setTextColor(Color.WHITE);
                 textview.setBackgroundResource(R.drawable.hot_words_bg);
                 textview.setTextSize(18);
                 textview.setOnClickListener(this);
                 textview.setMinimumWidth(100);
                 textview.setSingleLine();
                 textview.setEllipsize(TextUtils.TruncateAt.END);
                 textview.setText(content);
                 LinearLayout.LayoutParams layoutparams = new LinearLayout.LayoutParams(
                         LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
                 addView(textview, layoutparams);
             }
         }
     }

     /**
      * 重写onLayout,在layout每个元素之前，需要计算该元素是否需要折行到下一行显示
      */
     protected void onLayout(boolean changed, int l, int t, int r, int b) {
         int count = getChildCount();
         if (count == 0) {
             super.onLayout(changed, l, count, r, b);
             return;
         }
         int lengthX = 0;
         int lengthY = 0;
         for (int i = 0; i < count; i++) {
             View child = getChildAt(i);
             int width = child.getMeasuredWidth();
             int height = child.getMeasuredHeight();
             child.layout(lengthX, lengthY, lengthX + width, lengthY + height);
             int right = lengthX + width + VIEW_MARGIN_HORIZONTAL;
             int nextWidth = 0;
             if (i < count - 1) {
                 nextWidth = getChildAt(i + 1).getMeasuredWidth();
             }
             if (right + nextWidth > (r - l)) {
                 lengthX = 0;
                 lengthY += height + VIEW_MARGIN_VERTICAL;
             } else {
                 lengthX = right;
             }
         }
     }

     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         int count = getChildCount();
         if (count == 0) {
             super.onMeasure(widthMeasureSpec, heightMeasureSpec);
             return;
         }
         int lengthX = 0;
         int lengthY = 0;
         int r = MeasureSpec.getSize(widthMeasureSpec);
         // 定义子View的宽度最大不能超过r宽度
         int childWidth = MeasureSpec.makeMeasureSpec(r, MeasureSpec.AT_MOST);
         for (int i = 0; i < getChildCount(); i++) {
             View child = getChildAt(i);
             child.measure(childWidth, MeasureSpec.UNSPECIFIED);
             int width = child.getMeasuredWidth();
             int height = child.getMeasuredHeight();
             int right = lengthX + width + VIEW_MARGIN_HORIZONTAL;
             int nextWidth = 0;
             // 非最后一个元素需要尝试计算一下能否放的下
             if (i < count - 1) {
                 nextWidth = getChildAt(i + 1).getMeasuredWidth();
             } else {
                 // 最后一个计算高度的时候要加最后一排的高度
                 lengthY += height;
             }
             if (right + nextWidth > r) {
                 // 如果放不下，换行
                 lengthX = 0;
                 lengthY += height + VIEW_MARGIN_VERTICAL;
             } else {
                 // 如果能放下，往后加
                 lengthX = right;
             }
         }
         setMeasuredDimension(
                 widthMeasureSpec,
                 MeasureSpec.makeMeasureSpec(lengthY,
                         MeasureSpec.getMode(heightMeasureSpec)));
     }

     @Override
     public void onClick(View view) {
         if (mHotwordsOnclickListener != null) {
             mHotwordsOnclickListener.hotwordOnclick((TextView) view);
         }
     }
 }