Android RecyclerChart其它图表绘制示例详解

private <T extends BarEntry> void drawLineChartWithoutPoint(Canvas canvas, RecyclerView parent, YAxis mYAxis) {
  final float parentRightBoard = parent.getWidth() - parent.getPaddingRight();
  final float parentLeft = parent.getPaddingLeft();
  //BaseBarChartAdapter adapter = (BaseBarChartAdapter) parent.getAdapter();
  final int childCount = parent.getChildCount();
  for (int i = 0; i < childCount; i++) {
    View child = parent.getChildAt(i);
    T barEntry = (T) child.getTag();
    float preValue = Integer.MIN_VALUE;
    if (i > 0){
      View pointF1Child = parent.getChildAt(i - 1);
      T barEntryLeft = (T) pointF1Child.getTag();
      if (barEntryLeft instanceof  EcgEntry){
        List<Float> values = ((EcgEntry) barEntryLeft).values;
        if (values.size() > 0){
          preValue =  values.get(values.size() - 1);
        }
      }
    }
    if (barEntry instanceof EcgEntry){
      List<Float> values = ((EcgEntry) barEntry).values;
      RectF rectF = ChartComputeUtil.getBarChartRectF(child, parent, 
                                                      mYAxis, mLineChartAttrs, barEntry);
      if (rectF.left < parentLeft || rectF.right > parentRightBoard){
        continue;
      }
      float innerItemWidth = rectF.width()/values.size();
      float startX = rectF.left;
      // preValue 用来衔接两个ItemView中的path,防止断连的问题。
      preValue = preValue == Integer.MIN_VALUE?values.get(0): preValue;
      float firstPosition = ChartComputeUtil.getYPosition(preValue, parent,
                                                          mYAxis, mLineChartAttrs);
      Path pathItem = new Path();
      pathItem.moveTo(startX, firstPosition);
      for (int j = 0; j < values.size(); j++) {
        float yPosition = ChartComputeUtil.getYPosition(values.get(j), 
         parent, mYAxis, mLineChartAttrs);
        pathItem.lineTo(startX + j * innerItemWidth, yPosition );
      }
      canvas.drawPath(pathItem, mLineChartPaint);
    }
  }
}

public class EcgEntry extends BarEntry{
    public List<Float> values = new ArrayList<>();
    public EcgEntry(int i, float value, long timestamp, int type) {
        super(i, value, timestamp, type);
    }
}