MPAndroidChart实时图c＃

Question

我正在尝试MPAndroidChart绘制实时数据，但当图表使用MoveViewToX（float xIndex）方法移动时，有时当前视图中显示的第一个值（和标签）会消失。这是代码：

//Adding entries
protected void AddEntry(int rssi, int i)
    {
        LineData data = linechart.LineData;
        if (data != null)
        {
            LineDataSet dataset = (LineDataSet)data.GetDataSetByIndex(0);
            if (dataset == null)
            {
                dataset = createSet();
                data.AddDataSet(dataset);
            }
            //Add new value
            data.AddXValue(i.ToString() + " ");
            data.AddEntry(new Entry(rssi, dataset.EntryCount), 0); 
            linechart.NotifyDataSetChanged();
            linechart.SetVisibleXRangeMaximum(10);
            linechart.SetVisibleXRangeMinimum(10);
            //scroll to the last entry
            linechart.MoveViewToX(data.XValCount);
        }

    }

数据集：

protected LineDataSet createSet() 
    {
        LineDataSet lineset = new LineDataSet(null, "Signal Power (dBm)");
       lineset.SetDrawCubic(false);
        //lineset.SetDrawFilled(true);

        lineset.Color = Color.Aqua;
        lineset.SetCircleColor(Color.DarkCyan);
        lineset.CircleSize = 3f;
        lineset.SetCircleColorHole(Color.DarkCyan);
        lineset.AxisDependency = linechart.AxisRight.GetAxisDependency(); 
        lineset.LineWidth = 2f;
        lineset.SetDrawValues(false);
        return lineset;
    }

布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:p1="http://schemas.android.com/apk/res/android"
    p1:minWidth="25px"
    p1:minHeight="25px"
    p1:layout_width="match_parent"
    p1:layout_height="match_parent"
    p1:id="@+id/relativeLayout1">
<com.github.mikephil.charting.charts.LineChart
    p1:id="@+id/chart1"
    p1:layout_width="match_parent"
    p1:layout_height="250dp" />
<ListView
    p1:minWidth="25px"
    p1:minHeight="25px"
    p1:layout_width="match_parent"
    p1:layout_height="wrap_content"
    p1:layout_marginTop="260dp"
    p1:listSelector="@android:color/transparent"
    p1:id="@+id/list" />
</RelativeLayout>

以下是发生的事情：enter image description here 提前谢谢。