LineChartActivity.java

public class LineChartActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chart_common);

        AnyChartView anyChartView = findViewById(R.id.any_chart_view);
        anyChartView.setProgressBar(findViewById(R.id.progress_bar));

        new LongOperation(anyChartView).execute();
    }
}

LongOperation.java

public class LongOperation extends AsyncTask<Void, Void, Wrapper> {

    private AnyChartView anyChartView;

    public LongOperation(AnyChartView anyChartView) {
        this.anyChartView = anyChartView;
    }

    @Override
    protected Wrapper doInBackground(Void... params) {
        List<DataEntry> seriesData = new ArrayList<>();
        List<List<Score>> allScores = new ArrayList<>();
        allScores.add(Score.getDummyScores());
        allScores.add(Score.getDummyScores());
        allScores.add(Score.getDummyScores());

        List<DataEntry> seriesData = new ArrayList<>();

        seriesData.add(new CustomDataEntry("Seq 1", Stream.of(allScores.get(0)).map(Score::getFirstSequenceMark).collect(Collectors.toList())));
        seriesData.add(new CustomDataEntry("Seq 2", Stream.of(allScores.get(0)).map(Score::getSecondSequenceMark).collect(Collectors.toList())));
        seriesData.add(new CustomDataEntry("Seq 3", Stream.of(allScores.get(1)).map(Score::getFirstSequenceMark).collect(Collectors.toList())));
        seriesData.add(new CustomDataEntry("Seq 4", Stream.of(allScores.get(1)).map(Score::getSecondSequenceMark).collect(Collectors.toList())));
        seriesData.add(new CustomDataEntry("Seq 5", Stream.of(allScores.get(2)).map(Score::getFirstSequenceMark).collect(Collectors.toList())));
        seriesData.add(new CustomDataEntry("Seq 6", Stream.of(allScores.get(2)).map(Score::getSecondSequenceMark).collect(Collectors.toList())));

        return new Wrapper(seriesData, allScores);
    }

    @Override
    protected void onPostExecute(Wrapper wrapper) {
        List<DataEntry> seriesData = wrapper.getSeriesData();
        List<List<Score>> allScores = wrapper.getAllScores();

        Cartesian cartesian = AnyChart.line();

        cartesian.animation(true);

        cartesian.padding(0d, 0d, 20d, 8d);

        cartesian.crosshair().enabled(true);
        cartesian.crosshair()
                .yLabel(true)
                .yStroke((Stroke) null, null, null, (String) null, (String) null);

        cartesian.tooltip().positionMode(TooltipPositionMode.POINT);

        cartesian.yAxis(0).title("Mark/20");
        cartesian.xAxis(0).labels().padding(5d, 5d, 5d, 5d);

        Set set = Set.instantiate();
        set.data(seriesData);

        Mapping mapping0 = set.mapAs("{ x: 'x', value: 'value' }");
        Line series0 = cartesian.line(mapping0);
        series0.name(allScores.get(0).get(0).getCourse().getAbbr());
        series0.hovered().markers().enabled(true);
        series0.hovered().markers()
                .type(MarkerType.CIRCLE)
                .size(4d);
        series0.tooltip()
                .position("right")
                .anchor(Anchor.LEFT_CENTER)
                .offsetX(5d)
                .offsetY(5d);

        for (int i = 1; i < allScores.get(0).size(); i++) {
            Mapping mapping = set.mapAs("{ x: 'x', value: 'value" + i + "' }");
            Line series = cartesian.line(mapping);
            series.name(allScores.get(0).get(i).getCourse().getAbbr());
            series.hovered().markers().enabled(true);
            series.hovered().markers()
                    .type(MarkerType.CIRCLE)
                    .size(4d);
            series.tooltip()
                    .position("right")
                    .anchor(Anchor.LEFT_CENTER)
                    .offsetX(5d)
                    .offsetY(5d);
        }

        cartesian.legend().enabled(true);
        cartesian.legend().fontSize(13d);
        cartesian.legend().padding(0d, 16d, 10d, 16d);

        anyChartView.setChart(cartesian);
    }
}

Wrapper.java

public class Wrapper {
    public List<DataEntry> seriesData;
    public List<List<Score>> allScores;

    public Wrapper(List<DataEntry> seriesData, List<List<Score>> allScores) {
        this.seriesData = seriesData;
        this.allScores = allScores;
    }

    public List<DataEntry> getSeriesData() {
        return seriesData;
    }

    public List<List<Score>> getAllScores() {
        return allScores;
    }
}