如何在MPAndroid图表中使用X值？

implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0'

<com.github.mikephil.charting.charts.LineChart
    android:id="@+id/chart"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

LineChart chart = findViewById(R.id.chart);

List<Entry> entries = new ArrayList<>();
entries.add(new Entry(0, 4));
entries.add(new Entry(1, 8));
entries.add(new Entry(2, 6));
entries.add(new Entry(3, 2));

LineDataSet dataSet = new LineDataSet(entries, "数据集名称");
dataSet.setColor(Color.BLUE);
dataSet.setLineWidth(2f);

LineData lineData = new LineData(dataSet);

chart.setData(lineData);

chart.invalidate();