private void newLine() {
   if (mLine != null && mLine.size() > 0 && !mLines.contains(mLine)) {
     mLines.add(mLine);
   }
   mLine = new Line();
   mCurrentWidth = 0;
 }
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int widthSize = MeasureSpec.getSize(widthMeasureSpec);
    int heightSize = MeasureSpec.getSize(heightMeasureSpec);

    int widthMode = MeasureSpec.getMode(widthMeasureSpec);
    int heightMode = MeasureSpec.getMode(heightMeasureSpec);
    // 布局区域
    childrenWidth = widthSize - getPaddingLeft() - getPaddingRight();
    int childrenHeight = heightSize - getPaddingTop() - getPaddingBottom();
    reset();
    for (int i = 0; i < getChildCount(); i++) {
      View child = getChildAt(i);
      if (child.getVisibility() == View.GONE) {
        continue;
      }

      int childWidthMeasureSpec =
          MeasureSpec.makeMeasureSpec(
              widthSize, widthMode == MeasureSpec.EXACTLY ? MeasureSpec.AT_MOST : widthMode);
      int childHeightMeasureSpec =
          MeasureSpec.makeMeasureSpec(
              heightSize, heightMode == MeasureSpec.EXACTLY ? MeasureSpec.AT_MOST : heightMode);
      child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
      if (mLine == null) {
        mLine = new Line();
      }
      int measuredWidth = child.getMeasuredWidth();
      // 子View最大宽度不超过内容区域
      if (measuredWidth > childrenWidth) {
        child.measure(
            MeasureSpec.makeMeasureSpec(childrenWidth, MeasureSpec.EXACTLY),
            childHeightMeasureSpec);
      }
      mCurrentWidth += measuredWidth;
      // 不超过一行

      if (mCurrentWidth <= childrenWidth) {
        mLine.addView(child);
        mCurrentWidth += mHorizontalSpacing;
        // 加上间距后超过一行
        if (mCurrentWidth >= childrenWidth) {
          newLine();
        }
        // 超过一行
      } else {
        if (mLine.size() == 0) {
          mLine.addView(child);
          newLine();
        } else {
          newLine();
          mLine.addView(child);
          mCurrentWidth += child.getMeasuredWidth() + mHorizontalSpacing;
        }
      }
      // 把最后一行加到集合里

    }
    if (mLine != null && mLine.size() > 0) {
      mLines.add(mLine);
    }
    int totelHeight = 0;
    if (heightMode == MeasureSpec.EXACTLY) {
      totelHeight = heightSize;
    } else if (heightMode == MeasureSpec.AT_MOST) {
      for (int i = 0; i < mLines.size(); i++) {
        int lineHeight = mLines.get(i).getLineHeight();
        totelHeight += lineHeight;
        if (i != 0) {
          totelHeight += mVerticalSpacing;
        }
      }
      totelHeight = Math.min(childrenHeight, totelHeight);
    }

    setMeasuredDimension(widthSize, totelHeight + getPaddingTop() + getPaddingBottom());
  }