android plot,androidplot行不显示

我期待看到由我的图上2点定义的直线，但没有显示出来。 我跟着教程，一切正常，然后我试图改变一系列的数字。下面是代码：androidplot行不显示

plotList的类型是List，它包含2个值12.634和12.634

XYSeries series1 = new SimpleXYSeries(plotList,

SimpleXYSeries.ArrayFormat.Y_VALS_ONLY,

"Series1");

// Create a formatter to use for drawing a series using

// LineAndPointRenderer

// and configure it from xml:

LineAndPointFormatter series1Format = new LineAndPointFormatter();

series1Format.setPointLabelFormatter(new PointLabelFormatter());

series1Format.configure(parentActivity.getApplicationContext(),

R.xml.line_point_formatter_with_plf1);

//plot.setDomainRightMax(plotList.size());

//plot.setDomainBoundaries(0, 5, BoundaryMode.AUTO);

// plot.setDomainStepValue(1);

//plot.setRangeBoundaries(0,40,BoundaryMode.AUTO);

// add a new series' to the xyplot:

plot.addSeries(series1, series1Format);

// reduce the number of range labels

plot.setTicksPerRangeLabel(3);

plot.getGraphWidget().setDomainLabelOrientation(-45);