MPAndroidChart Pie chart highlighter

MainActivity.java

package com.example.myapplication;

import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.SpannableString;
import android.text.style.ForegroundColorSpan;
import android.text.style.RelativeSizeSpan;
import android.text.style.StyleSpan;
import android.util.Log;
import android.view.WindowManager;
import com.github.mikephil.charting.animation.Easing;
import com.github.mikephil.charting.charts.PieChart;
import com.github.mikephil.charting.components.Legend;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.data.PieData;
import com.github.mikephil.charting.data.PieDataSet;
import com.github.mikephil.charting.data.PieEntry;
import com.github.mikephil.charting.formatter.PercentFormatter;
import com.github.mikephil.charting.highlight.Highlight;
import com.github.mikephil.charting.listener.OnChartValueSelectedListener;
import com.github.mikephil.charting.utils.ColorTemplate;
import com.github.mikephil.charting.utils.MPPointF;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements OnChartValueSelectedListener {
    private PieChart chart;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);

        setTitle("PieChartActivity");


        chart = findViewById(R.id.pieChart);
        chart.setUsePercentValues(true);
        chart.getDescription().setEnabled(false);
        chart.setExtraOffsets(5, 10, 5, 5);

        chart.setDragDecelerationFrictionCoef(0.95f);

//        chart.setCenterTextTypeface(tfLight);
        chart.setCenterText(generateCenterSpannableText());

        chart.setDrawHoleEnabled(true);
        chart.setHoleColor(Color.WHITE);

        chart.setTransparentCircleColor(Color.WHITE);
        chart.setTransparentCircleAlpha(110);

        chart.setHoleRadius(80f);
        chart.setTransparentCircleRadius(61f);

        chart.setDrawCenterText(true);

        chart.setRotationAngle(0);
        // enable rotation of the chart by touch
        chart.setRotationEnabled(true);
        chart.setHighlightPerTapEnabled(true);

        // chart.setUnit(" €");
        // chart.setDrawUnitsInChart(true);

        // add a selection listener
        chart.setOnChartValueSelectedListener(this);

        chart.animateY(1400, Easing.EaseInOutQuad);
        // chart.spin(2000, 0, 360);

        Legend l = chart.getLegend();
        l.setVerticalAlignment(Legend.LegendVerticalAlignment.TOP);
        l.setHorizontalAlignment(Legend.LegendHorizontalAlignment.RIGHT);
        l.setOrientation(Legend.LegendOrientation.VERTICAL);
        l.setDrawInside(false);
        l.setXEntrySpace(7f);
        l.setYEntrySpace(0f);
        l.setYOffset(0f);

        // entry label styling
        chart.setEntryLabelColor(Color.WHITE);
//        chart.setEntryLabelTypeface(tfRegular);
        chart.setEntryLabelTextSize(12f);

        setData(5,5);
    }

    private void setData(int count, float range) {
        ArrayList<PieEntry> entries = new ArrayList<>();

        // NOTE: The order of the entries when being added to the entries array determines their position around the center of
        // the chart.
        for (int i = 0; i < count ; i++) {
            entries.add(new PieEntry((float) ((Math.random() * range) + range / 5)));
        }

        PieDataSet dataSet = new PieDataSet(entries, "Election Results");

        dataSet.setDrawIcons(false);

        dataSet.setSliceSpace(3f);
        dataSet.setIconsOffset(new MPPointF(0, 40));
        dataSet.setSelectionShift(5f);

        // add a lot of colors

        ArrayList<Integer> colors = new ArrayList<>();

        colors.add(ColorTemplate.getHoloBlue());

        dataSet.setColors(colors);
        //dataSet.setSelectionShift(0f);

        PieData data = new PieData(dataSet);
        data.setValueFormatter(new PercentFormatter(chart));
        data.setValueTextSize(11f);
        data.setValueTextColor(Color.WHITE);
//        data.setValueTypeface(tfLight);

        dataSet.setHighlightEnabled(true);

        chart.setData(data);

        // undo all highlights
        chart.highlightValues(null);
        Highlight[] h = new Highlight[1];
        h[0] = new Highlight(0,0,0);

        chart.highlightValue(h[0]);

        chart.invalidate();
    }



    private SpannableString generateCenterSpannableText() {

        SpannableString s = new SpannableString("MPAndroidChart\ndeveloped by Philipp Jahoda");
        s.setSpan(new RelativeSizeSpan(1.7f), 0, 14, 0);
        s.setSpan(new StyleSpan(Typeface.NORMAL), 14, s.length() - 15, 0);
        s.setSpan(new ForegroundColorSpan(Color.GRAY), 14, s.length() - 15, 0);
        s.setSpan(new RelativeSizeSpan(.8f), 14, s.length() - 15, 0);
        s.setSpan(new StyleSpan(Typeface.ITALIC), s.length() - 14, s.length(), 0);
        s.setSpan(new ForegroundColorSpan(ColorTemplate.getHoloBlue()), s.length() - 14, s.length(), 0);
        return s;
    }

    @Override
    public void onValueSelected(Entry e, Highlight h) {

        if (e == null)
            return;
        Log.i("VAL SELECTED",
                "Value: " + e.getY() + ", index: " + h.getX()
                        + ", DataSet index: " + h.getDataSetIndex());
    }

    @Override
    public void onNothingSelected() {
        Log.i("PieChart", "nothing selected");
    }

}